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REFRIGERATOR SERVICE MANUAL

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1. Jexeedg V dINV I 1exeadg v4 19619998 dIAV I FN e41uDipoeg GON of dIAV Eg UDIMOeg dW y god UIEN _1 3UDIMOEg 92 TV RADIO 7 TV PART DISASSEMBLE Place tape on the outer edge of the TV case to protect the soft plastic from damage 2 or 3 layers is recommended Using a flat bladed screwdriver carefully pry the trim loose from the frame Carefully remove the trim Remove two phillips head screws located at the top of the TV Tip the TV forward and disconnect all wires Carefully remove the TV 93 HOW TO DISASSEMBLE AND ASSEMBLE 1 DOOR 1 Remove lower cover and then disconnect water supply tube in the lower part of freezer door Pull the water supply tube forward while pressing on the coupling as shown in the drawing re Disconnecting the tube under the door causes about 3 pints 1 5 litters of water to flow out Use a big container to catch it Note Connect the same tube color 2 Remove the a freezer door 1 Loosen hinge cover screw of freezer door and remove the cover Disconnect all connecting lines except grounding cord Connecting Line Earthing Cord 2 Turn hinge le
2. M FESISTOR METAL GLAZEDICHIPL 121 ORH2OOIL 622 FESIGTOR METAL GLAZEDICHIPI 71 GLAZEDICAPI 16 TAL 16 AIT n ne KEC_ CHANGJIANG 19 1 5 LOGIC KEC_CHANG JIANG 120 TRANSISTOR KTAIZ73 Y KTAGEDA TP KEC CHANG JANG 5 TRANSISTOR BIPOLAS EK 0 25 60 05 08 TRANSISTOR KTC3ISB TP Y_ KTCIIBIKEC CHANGJIANG 7 09 IC STANDARD LOGIC KRAIOGG SOT 23 TP TRANSISTOR IC LOGIC A Da PITT er n n 0 125 TRANSISTOR KTAIZ73 Y iKTAGEGA TP CANGJIANG mE 27 E DIC IEFS35I0R0 52 m 129 SNITCH TACT ITHWVSOZGAA 127 DE SOWA TAPING POSTECH E WFE 0 SAM TP TAPING SN DAE LEID SO RTE ETS La 0 52M TP TAPING SN DAE LEID Laz WIRE K TAPING SN LEAD OPT M ROOM WIRE 0 TP TAPING SN DAE LEID OP2 0ISPENSERI L WIRE 0 T LEAD PI 5 0 5244 TP TAPING SN DAE A LEAD PZ 5 FILTERICIRC DIE 120 0 PILKOR PIKOR P I 137 FILTER CI 40050 TNC TNC LI 981 GeOLEEDOX IFILTERICIACI 06320 TNC EK 0 5 me 12 RIONMFD INDUCTOR RADIAL LEAD 2077 GXI2 5 4 FUS
3. RESISTOR FINED CAREON FILM OFM 1 4 W 5 007 52 IRESISTOR FIXED CARBON FILM 14 1 4 W 5 00 TASC RESISTOR FIXED CARBON FILM 1 4 W 5 00 2 RESISTOR FIXED CARBON FILM K 1 4 W 5 00 9 GM 1 4 5 00 TAS2 RESISTOR FIXED CARBON FILM 1 5 1 2 W 5 00 TAS RESISTOR FIXED CARBON FILM OHM 1 4 W 5 00 RESISTOR FIXED CARBON FILM IK OHM 1 4 W 5 00 2 RESISTOR FIXED CARBON FILM 8 2K OHM 1 4 W 5 00 52 RESISTOR FIXED CARBON FILM OHM 1 4 W 5 00 52 RESISTOR FIXED CARBON FILM 1 4 W 5 00 TAS2 IKOH 1 8 W 5 2012 R TP 1 8 w 5 2012 RTP 1 8 W 2012 5 00 D 100 1 IX Qi Vo Y RESISTOR METAL GLAZED CHIP N S 202 RTP RESET ET B W 202 5 007 D S E allega E Ca CAE CIS jejeje e Jos RESISTOR METAL GLAZEDICHIPI RESISTOR METAL GLAZED CHIP El RESISTOR AZEDICHIPI ORHIOOILGZZ RESISTOR METAL GLAZED CHIP 107 _ORHIOO2 422 RESISTOR METAL GLAZED CHIP E ORJIG22E 472 RESISTOR METAL GLAZEDICHIPT io SO SRE E EE E EL
4. Measuring part IC1 Micom No 16 Lever S W 5V On 60 Hz OV OFF 5V 25 EXPLANATION FOR MICOM CIRCUIT 1 6 Door opening sensing circuit 1 GR G277STSA LSC27990TT pay 49 5 5 gI mr FOR sw ICI MICOM m is x gn x PR 5 1 Measuring part i IC1 MICOM No 44 45 45 46 47 48 Pin Door of Freezer and Refrigerator Closing 5 v O Switch at both ends at Off status Opening 0V O Switch at both ends at On status Since door switches A and B are interconnected if either fails the other will not respond properly If either switch fails the light will not come on 26 EXPLANATION FOR MICOM CIRCUIT 1 7 Temperature sensing circuit 1 GR G277STSA LSC27990TT Z Bs CON7 C2 peg 62 F SENSOR AING oce L X Zr gt 22 6 R32 bus T lt ANE cose X CED D SENSOR 5 223 i T 4 m L NG m CONI 58 R53 26 IKF CO AIN2 T x 5 evo RI SENSOR ED ZI p63 59 idi R54 Na 26 1KF AIN3 L x 7 AN R2 SENSOR 223 AR OV T8 lt nu a sa slo 26 MAGIC BEOM CPTI FRESH AND Em a T m 50 2
5. Remove Residuals Cut charging pipe ends and discharge refrigerant from drier and compressor Filter side cutters Parts replacement and welding Use R134a oil and refrigerant for compressor and drier Confirm N2 sealing and packing conditions before use Use good one for welding and assembly Weld under nitrogen gas atmosphere N2 gas pressure 0 1 0 2kg cm Repair in a clean and dry place Pipe Cutter Gas welder gas Evacuate for more than forty minutes after connecting manifold gauge hose and vacuum pump to high drier and low compressor refrigerant discharging parts pressure sides Evacuation Speed 113 liters minute Vacuum pump R134a exclusively Manifold gauge Refrigerant charging and charging inlet welding Weigh and control the allowance of R134a charging canister in a vacuum conditions to be 5 g with electronic scales and charge through compressor inlet Charge while compressor operates Weld carefully after pinching off the inlet pipe R134a exclusive charging canister mass cylinder refrigerant R134a manifold gauge electronic scales pinch off plier gas welding machine Check refrigerant leak and cooling capacity Check leak at weld joints Minute leak Use electronic leak detector Big leak Check visually Note Do not use soapy water for check Check cooling capacity Check radiator manually to see if warm Check hot
6. 01 03 Tue Room y 2F 11 21am 32 F e Division Power Initially On ist Press 2st Press 3th Press 4th Press Setting T 0 00 0 0 00 e o ooo eee emperature COLD COLDER COLDEST COOL COOLER Control Freezer Control 2 F 5 F 8 F 7 F 37 F 34 F 32 F 46 F 41 F Control The temperature can vary 5 F 3 C depending on the load condition k Whenever pressing button setting is repeated in the order of COLD COLDER gt COLDEST gt COOL gt COLDER e The actual inner temperature varies depending on the food status as the indicated setting temperature is a target temperature not actual temperature within refrigerator Refrigeration function is weak in the initial time Please adjust temperature as above after using refrigerator for minimum 2 3 days Freezer Notch is fixed COLDER unconcerned with display Notch during Icemaking Control Mode and Icemaker Stop switch is selected with ON 2 1 2 Outside temperature display function 1 The ambient temperature sensor is located under the upper right hinge cover This sensor reads the temperature of the room and displays it in the upper right corner of the display Room 32 F show Er 2 The ambient temperature is displayed between 16 F and 120 F Outside of that range the display will 3 Since the ambient temperature sensor is located at th
7. Check the sound when compressor is turned off Explain the principles of freezing cycles and refrigerant flowing phenomenon by internal pressure difference If sound is servere wrap the accumulator with foam and restrainer Sound of whistle when door closes When door closes the internal pressure of the refrigerator decreases sharply below atomosphere and sucks air into the refrigerator making the whistle sound Check the sound by opening and closing the refrigerator or freezer doors Broaden the cap of discharge hose for defrosting in the compressor compartment Seal the gap with sealant between out and inner cases of hinge in door SISONSVIG 31gnOd1 04 2 8 Odor Problems Causes Checks Measures Remarks Food Odor Food garlic kimchi etc Check the food is not wrapped Dry the deodorizer in a sunny place Check the shelves or inner with adequate ventilation wall are stained with food juice Store the food in the closed Be sure food is securely covered container instead of vinyl wraps with plastic wrap Clean the refrigerator and set Chedk food cleanliness button at strong Plastic Odor Odors of mixed food and plastic Check wet food is wrapped with Clean the refrigerator odors plastic bowl and bag It happens in the new refrigerator Persuade customers not to use plastic bag or wraps with wet food or odorous foods Odor fr
8. FRAME ASSEMBLY DISPLAY COVER DISPENSER DECO FRAME DISPLAY PWB PCB ASSEMBLY DISPLAY FUNNEL ASSEMBLY MICRO SWITCH FRAME FUNNEL LEVER SWITCH FUNNEL BUTTON LEVER HOLLDER BUTTON SOLENOID ASSEMBLY SPRING LEVER HOLDER CAP ASSEMBLY DUCT CAP DUCT DISPENSER LEVER FOAM NEW RUBBER CAP DECO DRAIN CAP COVER NOTE Not every model includes every option EXPLODED VIEW FREEZER DOOR PART GR G277STSA LSC27990TT Optional part EXPLODED VIEW REFRIGERATOR DOOR PART GR G277STSA LSC27990TT Optional part 100 EXPLODED VIEW REFRIGERATOR COMPARTMENT GR G277STSA LSC27990TT Optional part 101 EXPLODED VIEW REFRIGERATOR COMPARTMENT GR G277STSA LSC27990TT Optional part cu sta 102 EXPLODED VIEW MACHINE COMPARTMENT GR G277STSA LSC27990TT Optional part L WWM WMO 57 lt wi 103 EXPLODED VIEW DISPENSER PART GR G277STSA LSC27990TT Optional part 104 EXPLODED VIEW TV PART GR G277STSA LSC27990TT 105 LG Electronics Inc P No 3828JD8985A JAN 2006 Printed in Korea
9. 8 1 F 7 2 F 6 3 F 5 4 F 4 5 F 8 6 F 2 7 F 1 8 F 0 9 F 0 9 F Down Down Down Down Down Down Down Down Down change Up 5 C 4 5 4 C 3 5 C 3 C 2 5 C 2 C 1 5 1 C 0 5 No 180 KQ 9 F 8 1 F 7 2 F 6 3 F 5 4 F 4 5 F 3 6 F 2 7 F 1 8 F 0 9 F Down Down Down Down Down Down Down Down Down Down change gt Temperature compensation at the freezer is performed the same as at the refrigerator The value for the freezer is twice that of the refrigerator gt This circuit enters the necessary level of temperature compensation for adjusting the appliance The method is the same for every model in this appliance family 32 EXPLANATION FOR MICOM CIRCUIT 2 Compensation circuit for temperature at freezer 1 GR G277STSA LSC27990TT xni OK RI9 OK JCR2 wir x P70 AINIO Rel OK R22 3 JCR3 x R23 I OK La JCR4 Temperature compensation in CUT JCRI 1 C 1 8 F JCR2 1 C 1 8 F JCR3 1 C 1 8 F 2 C 3 6 F JCR4 1 C 1 8 F Compensation Compensation for too warm for too cold Temperature compensation value Remarks JCR3 JCR4 JCR1 JCR2 6 6 0 C In shipment from f
10. CAPACITOR FIXED ELECTROLYTIC CAPACITOR FIXED ELECTROLYTIC CAPACITOR FIXED ELECTROLYTIC CAPACITOR FIXED ELECTROLYTIC CAPACITOR FIXED ELECTROLYTIC CAPACITOR ED FIDI CAPACITOR FIXED FILM CAPACITOR FIXED FILM 04 CAPACITOR FIXED ELECTROLYTIC a CAPACITOR FIXED CERAMIC High dielectric CAPACITOR FED EEREN igh dielectric 2012 50 BOX 20 R TP FIYSV 004 6 8 9 11 25 19001 CAPACITOR FIXED CERAMIC High dielectric 2AF 202 SUV BD 207 R TP XR 12 17 5 21 23 15407 CAPACITOR FIXED CERAMIC High dielectric NOON 202 SOV BOY 207 FIVSVI CC24 Sub IMAGICAFI CAPACITOR FIXED CERAMIC High dielectric R TP XR CAPACITOR FIXED CERAMICIHigh dielectric 08405126409 RESISTOR FIXED METAL FILM RESISTOR FIXED METAL OXIDE FILM 0R05603H509 RESISTOR FIXED CARBON FILM 2 RESISTOR FIXED METAL OXIDE FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED CARGO ISTOR FI RESISTOR FIXED POWER COATED WIRE WOUND RESISTOR FIXED POWER COATED WIRE WOUND RESISTOR FIXED CARBON FILM RESISTOR FIXED CARBON FILM RESISTOR FIXED METAL FILM RESISTOR FIXED METAL FILM RESISTOR FIXED METAL OXIDE FILM
11. NO VENTING WATSUSHITA ES EINE OMEN KDE IA NO VENTING OMRON R7 DAICHI VENTE S4M00G53 AO MURATA 4 00MHZ 0 5 IFF MURATA SVOGZID I4A_ SAMIHA UL VDE EK G20V_INRI4D621 TVRI4621 WHA IL JIN THINKING SVC271D 14A UL CSA VDE TP 270V INRI4DZ7I TVRI427I SAM WHA THINKING RECTIFIERS FRIO7 TP DELTA 0041 3 DELTA DI 2 14 17 DIODE RECTIFIERS FRIO TP DELTA 0041 IA DELTA DI3 0F DICE RECTIFIERS SANKEN EK NON 350V_3 54 BA SONSEC 0 MA SANKEN 03 04 DIODE RECTIFIERS 53 40 SHINDENGEN 400V 1 GOA SONGEC TOUA SHINDENEN A DIODE RECTIFIERS DSSBAG0 SHINDENGEN GOOV 4 EDI DIODE RECTIFIERS INQ4 TP PYUNGOWANG 6 7 8 0 DIODE RECTIFIERS IN4004 TP PYUNGCHANG DEL TA PYUNGCHANG 05 DIODE RECTIFIERS IN4007 TP MOTOROLA A DELTA PYUNGCHANG D DIODE SWITCHING 4148 TP ROHM 0035 75V_4S0MIL ROM PYUNGCHANG D DIODE ZENERS RLZ ROHM R TP LLDS LL 34 SOOMW 5 6V 20MA ROHU 201 DELTA PYUNGCHANG DO IRUBYOON SAM SANOLNG G LIDON IRUBYCON SAM SAMYOUNG G LUXON CENNIOS CI IRUBYOON SAM WHA SAMYOUNG G LUXON OE2 IALEYCON SAM WHA SAMYOUNG G LUXON CES FUBYCON SAM WHA SAMVOLNG G LUXON C FLEYCON SAM WHA SAMYOUNG G LUXON OES 65 C BIN SA WEA SAYONG 6 LION Eo E DIODE RECTIFIERS CAPACITOR FIXED ELECTROLYTIC
12. 2 0 C 3 6 F 470 Q 5 C 9 F 470 Q 2 5 C 4 5 F Cooler gt Temperature compensation table by adjustment value difference value against current temperature Ex If you change compensation resistance at a refrigerator RCR1 from 10 KQ current resistance to 18 kQ modified resistance the temperature at the refrigerator will increase by 1 C 1 8 F 31 EXPLANATION FOR MICOM CIRCUIT gt Temperature compensation table at the refrigerator is as follows Modification m 4700 2kQ 3 3kQ 5 6kQ 2kO 10kO 12kO 18kQ 33kO 56kQ 180kQ resistance No 0 5 C 1 C 1 5 C 2 C 2 5 3 C 3 5 4 C 145 C 5 C 4700 0 9 F 1 8 F 2 7 F 8 6 F 4 5 F 5 4 F 6 3 F 7 2 F 8 1 F 9 F change Up Up Up Up Up Up Up Up Up Up 0 5 C No 05 C 1 C 15 C 2 C 2 5 3 C 3 5 4 C 4 5 2kQ 10 9 F 0 9 F 1 8 F 2 7 F 8 6 F 4 5 F 5 4 F 6 3 F 7 2 F 8 1 F Down change Up Up Up Up Up Up Up Up Up 1 C 0 5 No 0 5 1 C 1 5 2 C 25 3 C 3 5 C 4 C 3 3 1 8 F 0 9 F 0 9 F 1 8 F 2 7 F 3 6 F 4 5 F 5 4 F 6 3 F 7 2 F Down Down change Up Up Up Up Up Up Up Up 1 5 1 C 0 5 C No 0 5 C 1 C 1 5 C 2 C 2 5 C 3 C 3 5 C 5 6 kQ 2 7 F 1 8
13. Compressor Low pressure side Condenser 1 High pressure side 3 Replacement of drier 1 Be sure to replace drier with R134a only when repairing pipes and injecting refrigerant 4 Nitrogen blowing welding 1 Use pressurized nitrogen to prevent oxidation inside the piping Nitrogen pressure 0 1 0 2 kg cm2 5 Others 1 Only nitrogen or R134a should be used when cleaning the inside of piping of the sealed system 2 Check leakage with an electronic leakage tester 3 Be sure to use a pipe cutter when cutting pipes 4 Be careful not the water let intrude into the inside of the cycle 78 TROUBLE DIAGNOSIS 3 4 Practical Work For Heavy Repair Items Precautions 1 Removal of residual refrigerant Evaporator Low pressure side KEY POINT Observe the sequence for removal of refrigerant If not compressor oil may leak Hot Line Compressor High pressure side 1 Continue to recover the refrigerant for more than 5 minutes after turning the refrigerator off 2 Install a piercing type valve on the high pressure line drier side Then use the appropriate recovery equipment to recover the refrigerant from the system When the refrigerant has been recovered install a piercing type valve on the low pressure side IT IS IMPORTANT TO OPEN THE SYSTEM IN THIS ORDER TO KEEP THE OIL FROM BEING FORCED OUT The use of piercing type valves will allow future
14. The capillary tube inserted depth Too much Drier clogging Capillary tube melts Over heat Clogged with foreign materials Desiccant powder Weld oxides Drier angle W Heat a clogged evaporator to check it As soon as the cracking sound starts the evaporator will begin to freeze E The evaporator does not cool from the beginning no evidence of moisture attached The evaporator is the same as before even heat is applied 50 TROUBLE DIAGNOSIS CLAIMS CAUSES AND CHECK POINTS HOW TO CHECK 3 Poor Cooling 1 Refrigerant Partly leaked Weld joint leak Parts leak 2 Poor defrosting capacity r Drain path pipe clogged generate heat Inject adiabatics into drain Inject through the Defrost heater does not Parts hose hole Seal with drain Foreign materials Adiabatics lump input penetration r Damage by a screw or clamp Other foreign materials input drain is not disconnected Plate disconnected Cord heate heater Wire is cut Heating wire Contact point between heating and electric wire Dent by fin evaporator Poor terminal contacts r Wire is cut r Lead wire Heating wire Contact point between heating and electric wire Heating wire is corroded Water penetration Badterminal connection Check visually
15. F 0 9 F 0 9 F 1 8 F 2 7 F 9 6 F 4 5 F 5 4 F 6 3 F Down Down Down change Up Up Up Up Up Up Up 2 C 1 5 C 1 C 0 5 No 05 C 1 1 5 2 C 2 5 3 C 8 2 3 6 F 2 7 F 1 8 F 0 9 F 0 9 F 1 8 F 2 7 F 3 6 F 4 5 F 5 4 F Refrigerator Down Down Down Drop change Up Up Up Up Up Up RCR1 2 5 C 2 C 1 5 1 C 0 5 C No 0 5 1 C 1 5 C 2 C 2 5 C 10kQ 4 5 F 3 6 F 2 7 F 1 8 F 0 9 F 0 9 F 1 8 F 2 7 F 3 6 F 4 5 F Down Down Down Down Down change Up Up Up Up Up 3 2 5 2 C 1 5 1 C 0 5 C No 05 C 1 C 1 5 2 C 12 5 4 F 4 5 F 3 6 F 2 7 F 1 8 F 0 9 F 0 9 F 1 8 F 2 7 F 8 6 F Down Down Down Down Down Down change Up Up Up Up 3 5 C 3 C 2 5 2 C 1 5 1 C 0 5 C No 0 5 C 1 C 1 5 C 18 6 3 F 5 4 F 4 5 F 3 6 F 2 7 F 1 8 F 0 9 F 0 9 F 1 8 F 2 7 F Down Down Down Down Down Down Down change Up Up Up 4 3 5 3 C 25 C 2 C 1 5 C 1 C 0 5 No 0 5 C 1 C 33 7 2 F 6 3 F 5 4 F 4 5 F 3 6 F 2 7 F 1 8 F 0 9 F 0 9 F 1 8 F Down Down Down Down Down Down Down Down change Up Up 45 C 4 C 3 5 3 C 25 C 2 C 115 C 1 C 05 No 0 5 C 56
16. MICOMI CCB 2 104 104 4 4 7K 22 EXPLANATION FOR MICOM CIRCUIT 1 4 Load dispenser operation door opening circuit 1 LOAD DRIVING CIRCUIT The fan operates at the regular speed even if the door of the refrigerator or freezer is opened When the doors are closed the fan reverts to its original speed A B and D of door switch for the freezer or refrigerator are connected to the door open sensing circuit in parallel toward both ends of switch to determine door open at MICOM In the TEST mode the fan will stop if any door is opened It will resume operation when the door is closed Defrost AC Converting Refrigerator Dispenser Type of Load Compressor Heater Relay LAMP Heater Measuring part IC6 6 16 6 13 6 12 6 15 6 14 ON Within 1 V tatus OFF 12V 1 GR G277STSA LSC27990TT oe G CON2 IC6s 7 9 KID65003AF RUNNING CAPACITOR 1 5 RYI IALEIEBI2 2 DE 3 t J 9 lt 1 3 TANZI R LAMPICONT _BOX1 m2 LEI _ ALZUZBI2 R DOOR 1515 9 E cem red z C2 R LAVPILOWERI CON3 ES PIPE HEATER T FANAI CO
17. The circuits involving the freezer and refrigerator sensors control the temperature in both the freezer and the refrigerator The icemaker sensor detects when ice is made The defrost sensor determines both the need for defrosting and the efficiency of the defrost operation See the table below for voltages and checkpoints SENSOR CHECK POINT NORMAL 22 F 122 F IN SHORT IN OPEN Freezing sensor POINT A Voltage Defrost sensor POINT Voltage Refrigerator sensor 1 POINT Voltage 0 5 V 4 5 V OV 5V Refrigerator sensor 2 POINT Voltage Magic room Opti Fresh Sensor POINT E Voltage 27 EXPLANATION FOR MICOM CIRCUIT 1 8 Switch entry circuit The following circuits are sensing signal form the damper motor reed switch for testing and diagnosing the refrigerator 1 GR G277STSA LSC27990TT IC MICOM P40 R28 4 7K SWI 1 9 Option designation circuit model separation function 1 GR G277STSA LSC27990TT R24 4 1K R 2 4 m 0 circuits shown above vary according to which features are included on your particular model Separation Connection Status Application Standard Connection OptiFresh exist OP1 OUT OptiFresh don t exist p These circuits are preset at the factory and cannot be altered 28 EXPLANATION FOR MICOM
18. Unsealed food 2 Condensation in the refrigerator compartment Door opens f Insufficient closing but not closes Door sag Food hinders door closing Gasket gap 3 Condensation on liner foam Coolairleak Not fully filled Top table part and transmitted Out plate Ref Lower part Flange gap Not sealed Gasket gap E Inspect parts measurements and check visually 54 TROUBLE DIAGNOSIS CLAIMS CAUSES AND CHECK POINTS HOW TO CHECK 6 Condensation and ice formation 7 Sounds 4 Condensation on door r Condensation on the duct door Duct door heater is cut Condensation on the Recess Heater is cut Adiabatics liquid contraction Condensation Bad adhesion Door liner shape mismatch on the gasket surface Comer qe much notch Broken Home Bar heater is cut 5 Water on the floor Condensation in the refrigerator compartment Defrosted water overflows Clogged discharging hose Discharging hose Evaporation tray located at wrong place location Tray _ Damaged 1 Breaks holes Small Capacity Position of drain 1 Compressor compartment operating sounds r Compressor sound Sound from machine itself inserted Sound from vibration Restrainer r Bushing 7 Too hard seat Distor
19. in the freezer compartment drier inlet and outlet and drier auxiliary in the compressor compartment high pressure side 2 Check the end of compressor sealing pipe low pressure side 3 Check silver soldered parts 4 Check bending area of wire condenser pipe in compressor compartment cracks can happen during bending 5 Check other parts compressor compartment and evaporators in freezer compartment Shortage of refrigerant Check frost formation on the surface of evaporator in the freezer compartment If the frost forms evenly on the surface it is OK If it does not it is not good Find out the leaking area repair evacuate and recharge the refrigerant No leaking remove the remaining refrigerant and recharge new refrigerant Drier must be replaced SISONSVIG ATANOUL Z9 Problems Causes Checks Measures Remarks High temperature in the freezer compartment Cycle pipe is clogged Check sequence 1 Check temperature of condenser manually If it is warm OK If it is not compressor discharging joints might be clogged 2 Manually check whether hot line pipe is warm If it is warm OK If it is not condenser outlet weld joints might be colgged Maybe evacuate should be the first step here If the servicer puts a torch to a charged system the joint will explode and spray refrigerant on him Also if oil is forced
20. 4 No cooling air circulation r Faulty fan motor Fan is constrained Small cooling air Insufficient discharge motor RPM Shorud and Fan shroud contact Clearance Damping evaporator contact Accumulated residual frost r Fan overload Fan misuse Bad low termperature RPM characteristics Rated power misuse Low voltage Faulty fan Fan misuse shape Loose connection Not tightly connected Insert depth Bent ign materials on rotating parts 5 Compressor capacity Rating misuse Small capacity Low valtage 6 Refrigerant r Malfunction of charging cylinder too much or too little Wrong setting of refrigerant 7 Continuous operation Insufficient compressor Faulty compressor No contact of temperature controller Foreign materials 8 Damper opens continuously m Foreign materials Adiabatics liquid dump jammed r The EPS styrofoam drip tray has sediment in it screw or other foreign material has fallen into the drip tray or damper Failed sensor Position of sensor Characteristics Bad characteristics of its own temperatue of damper Parts misuse Charge of temperature Impact characteristics 9 Food storing place Near the outlet of cooling air li Check visually after disassembly li Check visually a
21. CAUSES AND CHECK POINTS HOW TO CHECK 1 Faulty start 1 No power at outlet 2 No power on cord Bad connection between plug and adapter faulty plug ps distance between pins Pin outer diameter 3 Shorted start circuit m No power on p Disconnected copper wire Power cord is disconnected power cord Faulty soldering Internal electrical short Faulty terminal contact Loose contact Large distance between male terminal Thin female terminal Terminal disconnected Bad sleeve assembly L Disconnected Weak connection Short inserted cord length Wom out tool blade r Capacity of OLP is small L Characteristics of OLP is bad Bad connection OLP is off Power is disconnected Inner Ni Cr wire blows out Bad intemal connection Faulty terminal caulking Cu wire is cut Bad soldering r No electric power on compressor Faulty compressor Power does not conduct Damage Bad characteristics Initial resistance is high Bad connection with 9 loose compressor Assembly is not possible Bad terminal connection Faulty PTC 4 During defrost P automatic defrost Cycle was set at defrost when the refrigerator was produced Measuring instrument Multi tester E Check the voltage If the voltage is within 15 of the rated voltage it is OK li Check the terminal movement E Check both terminals of power cord P
22. LEE SOLENOID CUBE LEVER SW BL N Q o z lt AUGER MOTOR N OPTI FRESH M STEPPING MOTOR 2 co OPTI FRESH SENSOR Tum WATER LR PILOT STEPPING MOTOR Om HK R2 SENSOR N BL N Ed o o z a FEE EI RN B R1 SENSOR R DOOR OPEN PERCEPTION HEATER SHEET DAMPER e o RR SOLENOID DISPENSER RUNNING DISPENSER BL PK CAPACITOR LIGHT it STARTING 2 3 1 CAPACITOR PWB ASSEMBLY 1 5 n TO 6 DISPLAY M 6 5 3 2 WATER TANK COMPRESSOR AMBIEN EARTH PART P T C ASSEMBLY SENSOR D R DOOR HEATER SHEET DUCT DOOR Cord d d SWITCH pk BK BLACK BN BROWN BO BRIGHT ORANGE GY GRAY RD RED YL YELLOW GN GREEN PR PURPLE WH WHITE WH BK WHITE BLACK SB SKY BLUE PK PINK GN YN GREEN YELLOW BL WH BLUEMHITE RD WH REDWHITE 48 TROUBLE DIAGNOSIS 1 Troubleshooting CLAIMS
23. 1 amp 2 mechanical model disconnect thermostat from the assembly 1 Check the faulty connector of housing and reassemble wrongly assembled parts 2 If the parts are damaged remove the parts and replace it with a new one SISONSVIG 3 18nou8 L 99 2 6 Icing Problems Causes Checks Measures Remarks Icing in the 1 Bad circulation of cool air Check if food is stored properly Be acquainted with how to use Check the defrost refrigerator Clogged intake port in the check if discharge and intake port Sealing on connecting parts related parts if problem compartment refrigerator compartment are clogged Check the damper and replace is caused by faulty Damper icing Sealing is not good Check icing on the surface of it if it has defects defrosting Pipe icing Too much food is stored and clogs baffle and cool air path pipe after Check defrost After forced Discharging the discharge port dissembling the container box defrosting check ice in the pipe icing Bad defrosting Check icing at intake ports of evaporator and pipes freezer and refrigerator compartment 2 Faulty door or refrigerator compartment Faulty gasket Faulty assembly Check gasket attached conditions Check door assembly conditions Correct the gasket attachment conditions and replace it Door assembly and replacement Replacement should be done when it cannot be rep
24. 11 21am se 01 03 Tue 34 DC 12V Main MICOM a LCD LED dedicated MICOM IAA GND Transmission error status i Reception notch status CON6 HEATER SHEET 2 DUCT DOOR 77 3 H x F27 4H2 S T 54 ae celle zie gt 04 5 6V 0 5 RB E pap 43 4 7K I 6 13 m 0 I a CIOG6 1 I Room EXPLANATION FOR MICOM CIRCUIT 2 Sensor resistance characteristics table Measuring Temperature C Freezing Sensor lara e e Defrost sensor Ambient sensor 20 C 22 3 77 KQ 15 C 16 9 kQ 60 kQ 15 C 13 0 kQ 47 3 5 C 10 1 kQ 38 4 0 C 7 8 KQ 30 5 C 6 2 KQ 24 1 10 C 4 9 19 5 kQ 15 C 3 9 15 9 kQ 20 C 3 1 13 25 C 2 5 kQ 11 30 C 2 0 kQ 8 9 KQ 40 C 1 4 kQ 6 2 50 C 0 8 KQ 4 3 kQ gt Resistance value allowance of sensor is 5 gt When measuring the resistance value of the sensor allow the temperature of that sensor to stabilize for at least minutes before measuring This delay is necessary because of the sense speed relationship gt Use a digital tester to measure the resistance An analog tester has to great a margin of error gt Resistance of the cold storage sensor 1 and 2 shall be measured with a digital tester after separating CON8 of the PWB ASSEMBLY and the MAIN part gt Resistance of the freezing
25. CIRCUIT 1 10 Stepping motor operation circuit 1 GR G277STSA LSC27990TT The motor is driven by magnetism formed in the areas of the coils and the stator Rotation begins when a HIGH signal is T ICIO 9 16 TA7774P CON7 ICI 9 1 2 MICOM t A pa 57 4 0 STEPPING 38 10K 7 10K 10K ST 0P B i B MOTOR pas 39 B 6 10 0 A3 Eu 2 n 13 applied to MICOM Pin 33 of IC10 TA7774F This causes an output of HIGH and LOW signals on MICOM pins 34 and 35 Explanation The stepping motor is driven by sending signals of 3 33 mSEC via MICOM pins 33 34 and 35 as shown in the chart below These signals are output via terminals 10 11 14 and 15 via input terminals 3 6 and 8 of IC10 TA7774F the motor drive chip The output signals allow the coils wound on each phase of the stator to form a magnetic field which causes rotation Input to the terminals INA and INB of IC10 as shown in the chart below drives the motor CCW Reverse rotation y Positive rotation CW INA INB DI DI 29 EXPLANATION FOR MICOM CIRCUIT 1 11 Fan motor driving circuit freezer mechanical area 1 The circuit cuts all power to the fan drive IC resulting in a standby mode 2 This circuit changes the speed of the fan motor by varying the DC voltage between 7 5 Vdc and 16 Vdc 3 This circuit stops the fa
26. Check terminal Conduction OK No conduction NG If wire is not cut refer to resistance P Power V Voltage R Resistance p V 51 TROUBLE DIAGNOSIS CLAIMS CAUSES AND CHECK POINTS HOW TO CHECK 3 Poor Cooling frost 3 Cooling air leak r Bad gasket adhestion Residual Weak heat from heater Sheath Heater rated Faulty characteristics Seat D missing location thickness Too short defrosting time Defrost Sensor Air inflow through the fan motor Bad insulation of case door Structural fault Gasket gap No automatic defrosting Defrost does not retum Bad attachment Contraction Door sag Bad adhesion Weak binding force at hinge 4 No cooling air circulation r Faulty fan motor Fan motor Self locked Wire is cut Bad terminal contact Door switch Faults Contact distance Button pressure Melted contact Contact Refrigerator and freezer switch reversed Button is not pressed Poor door attachment Door liner dimension Contraction inner liner Misalignment Bad terminal connection Adiabatics liquid leak li Check the fan motor conduction OK No conduction NG 52 TROUBLE DIAGNOSIS CLAIMS CAUSES AND CHECK POINTS HOW TO CHECK 3 Poor Cooling
27. Check the resistance of power cord with tester if it is 00 it is shorted Find and remove the cause of problem ex short high voltage low voltage Replace with rated fuse Replace with rated fuse after confirming its specification W If fuse blowns out frequently confirm the cause and repair 2 2 Compressor Check other parts Problems Causes Checks Measures Remarks Compressor Faulty PTC Check the resistance If resistance is infinite replace it does not Vlaue ee is defective with new one operate If it is not infinite it is normal Compressor is locked up If compressor assembly parts are normal capacitor PTC OLP apply power directly to the compressor to force operation Auxiliary winding Main winding Power OLP It starts as soon as it is contacted During forced operation Operates Check other parts Does not operate operate Replace the frozen compressor with new one weld evacuate and recharge refrigerant Refer to weld repair procedures SISONSVIG 318noug8 L 09 2 3 Temperature Rotate rotor manually and check rotation Wire is cut Check for bad terminal connection Fan constraint Fan shroud contact Confirm visually Fan icing Confirm visually Maintain clearance and remove ice Repair and or replace shroud if fan is constrained by shrou
28. Fill mode If there is an ERROR it can only be checked in the TEST mode 3 Caution If the test is performed before water in the icemaker is frozen the ejector will pass through the water When the Fill mode begins Stage 4 unless the water supply has been shut off added water will overflow into the ice bin If the control doesn t operate normally in the TEST mode check and repair as needed 4 After water is supplied the normal CYCLE is followed icemaking Harvest Fill Park Position 5 Five seconds after Stage 5 is completed the Ice Maker returns to MICOM control The time needed to supply water resets to the pre test setting Diagnosis TABLE STAGE ITEMS INDICATOR REMARKS Five seconds after heater starts a 1 HEATER heater will go off if the temperature by sensor is higher than 20 C 2 MOTOR Five seconds after heater starts you can confirm that a motor is moving HALL IC I After the icemaker detects that ice has been 3 detection of made the motor and heater are off but on position standby until the cycle is cancelled HALL IC II You can confirm HALL IC detection of 4 detection of position position Two seconds after detection of initial 9 VALVE position you can confirm that valve is on 6 Reset Return to Status prior to Five seconds after fifth stage is completed TEST MODE The icemaker resets to initial status 3 DEFECT D
29. Height of Refrigerator Make the refrigerator level first If the refrigerator is not installed on a flat floor the height of freezer and refrigerator door may not be the same 1 If the freezer door is lower than the refrigerator door Height 2 Difference Insert a driver into the groove of the adjusting screw and turn in the direction of the arrow clockwise until the refrigerator is level 3 When the refrigerator door is lower than the freezer door Adjust the level when the refrigerator door is lower than the freezer door during the use of the refrigerator 1 Using the wide side of the tool for adjustment turn the keeper nut clockwise to loosen the keeper nut 2 Using the narrow side of the tool for adjustment turn the adjustment hinge pin 4 clockwise or 7 counterclockwise to level the refrigerator and freezer door 3 After setting the level of the door turn the keeper nut 7 counterclockwise to tighten Caution Do not force too hard to level the height The hinge pin can be pulled out Adjustable range of height Maximum of 2 10 5 mm Differenc 2 If the freezer door is higher than the refrigerator door Height e Insert a driver into the groove if the adjusting screw and turn in the direction of the arrow clockwise until the refrigerator is level DKeeper nut A
30. Q DISP HEATER 9 HE ne AINI5I LEISBIZI lt 2 779 2 07 FUSENELTING DEF HEATER Lg M HEI T h 5 m C ALZIORIZ O 3 ood 10 1 P77 LAINE 8 9 iz 09 9 NA M004 6 1 9 9 j re Ro 480 26001 DA EXPLANATION FOR MICOM CIRCUIT 1 5 Dispenser operation circuit 1 GR G277STSA LSC27990TT POWER Rol eme TEM ICT i T EI 9 __k10650034F i 004 16 lt 9 Poo CIN FD AUGER MOTOR Lo Do SWITCH 7 L DI IN4004 2 10 POI i ALDII2 E 525 5 C2 LIEN Se i ulala z 3 WATER z E ie ete SE RYIO I i PILOT ALDII2 CO 1 5 13 CONS b ALDII2 ESOVAC e nm 8 O Eo wd M ETIN RETRO UR x RIO l nera 4 Rile 560 29 E K 100 Pal 2 3 528 W e h 1 Check load driving status WATER VALVE Type of Load GEARED SOLENOID PILOT SOLENOID MOTOR BE DISPENSER OTO CU WATER VALVE SPENS Measuring part IC7 15 IC7 14 IC7 13 IC7 12 IC7 11 ON Within 1 V Status OFF 12V 2 Lever Switch sensing circuit
31. adhesion Fixedtape Not properly attached Noise during Hinge interference Bigger door foam operation Hinge Pin tilted Poor flatness No washer No grease Malfunction Not closed Interference between door liner and inner liner Refrigerator Stopper worn out compartment is r Bad freezer compartment door opened when freezer assembly compartment is No stopper closed faulty stopper 2 Odor m Temperature of High Faulty damper control refrigerator Button is set at weak compartment Dooris open something in the way Deodorizer No deodorizer Poor capacity 58 69 2 Faults 2 1 Problems Causes Checks Measures Remarks No power on Power cord cut Check the voltage with tester Replace the components outlet Faulty connector insertion Check visually Reconnect the connecting parts Faulty connection between plug and adapter Check visually Reconnect the connecting parts Fuse blows out Short circuit by wrong connection Low voltage products are connected to high voltage Short caused by vermin Electricity leakage High voltage Short circuit of components tracking due to moisture and dust penetration Check the fuse with tester or visually Check the input volt are with tester between power cord and products
32. air If it is strong in whole area set the control button at weak If it is strong only near the outlet of cool air keep food especially damp foods and easily frozen foods away from the outlet Vegetables are frozen Check the vegetables storage f vegetables are stored in the refrigerator shelf or chilled drawer instead of vegetable drawer they will be frozen Set the control button at weak if they are also frozen in the vegetable drawer The food stored at inside of the shelf freezes even the control button is set at MID Check if food is stored near the outlet of the cooling air The temperature at cooling air outlet is always below the freezing point Do not store food near the outlet of the cooling air as it block the air circulation Do not block the outlet If the outlet of the cooling air is blocked the refrigerator compartment will not be cooled 85 TROUBLE DIAGNOSIS 4 3 Odor and Frost Problems Checks and Measures Odor in the refrigerator compartment E Explain the basic principles of food odor e Each food has its own particular odor Therefore it is impossible to prevent or avoid food odor completely when food is stored in the completely sealed refrigerator compartment The deodorizer can absorb some portions of the odor but not completely The intensity of odor depends on refrigerator conditions and environments Check the temperature control button and set at s
33. clogged in the freezer compartment Discharging port is Clogged Too much food is stored Bad defrosting Check food storage conditions visually Check clogging at intake and discharging port of cooling air Check food occupation ratio in volume Less than 75 Check frost on the evaporator after dissembling shroud and fan grille Check icing at intake port of refrigerator compartment Be acquainted with how to use Check defrost Check ice on the evaporator and pipes after forced defrosting Check the parts related to defrosting if the problem is caused by the faulty defrosting 2 Bad freezer compartment door Faulty gasket Faulty assembly Check gasket attachment conditions Check door assembly conditions Correct the gasket attachement conditions and replace it Door assembly and replacement Replace when it can not be repaired 3 Over freezing in the freezer compartment Faulty MICOM Refrigerator operates pull down Check if it is operated intermittently The Temperature of freezer compartment is satisfactory but over freezing happens in the refrigerator compartment even though the notch is set at weak Replace defective parts 4 Bad defrosting Heater wire is cut Faulty defrost sensor Defrosting cycle Check frost on the evaporator after dissembling shroud and grille Check ice on the intake port in the refrigerator
34. compartment Check parts related to defrosting Check defrosting Check ice on the evaporator and pipes after forced defrosting 5 User is not familiar with how to use Door opens High moisture food water is stored Check food holds door open Check ice on the ice tray Be acquainted with how to use SISONSVIG 318noug8 L 19 2 7 Sound Problems Causes Checks Measures Remarks Hiss sound 1 Loud sound of compressor 1 1 Check the level of the 1 Maintain horizontal level operation refrigerator 1 2 Check the bushing seat conditions sagging and aging 2 Pipes resonate sound which is connected to the compressor 2 1 Check the level of pipes connected to the compressor and their interference 2 2 Check bushing inserting conditions in pipes 2 3 Touch pipes with hands or screw driver check the change of sound 3 Fan operation sound in the freezer compartment 3 1 Check fan insertion depth and blade damage 3 2 Check the interference with structures 3 3 Check fan motor 3 4 Check fan motor bushing insertion and aging conditions 4 Fan operation sound in the compressor compartment 4 1 Same as fan confirmation in the refrigerator 4 2 Check the drip tray support installation 4 3 Check the screw fastening conditions at condenser and drip tray 2 Replace bushing and seat if they are sagged and aged 3 Touch the pip
35. dispenser button is pressed It will turn off automatically shortly thereafter 6 Selection function of water crushed cube ice 1 Select crushed cubed water The display will show your selection 2 If you select cubed ice the auger is rotated to dispense cubes 3 If you select crushed ice the auger is rotated in the opposite direction to direct the cubes through the crusher 7 Water dispenser function 1 If you select water the display will indicate water 2 The water dispenser uses a solenoid connected directly to the water pipe Pressing the dispenser switch operates the solenoid which is at the right side of the back plate 21 EXPLANATION FOR MICOM CIRCUIT 1 Explanation for PWB circuit 1 1 Power circuit The power circuit includes a Switched Mode Power Supply SMPS It consists of a rectifier BD1 and CE1 converting AC to DC a switch IC2 switching the DC voltage a transformer and a feedback circuit IC3 and IC4 Caution Since high voltage 160 Vdc is maintained at the power terminal wait at least 3 minutes after unplugging the appliance to check the voltages to allow the current to dissipate Voltage of every part is as follows Part VAI CE1 CE2 CE3 CE4 CE5 Voltage 120 Vac 160 Vdc 14 Vdc 12 Vdc 15 5 Vdc 5 Vdc 1 GR G277STSA LSC27990TT BOI D3SBAGO L c Ra oe 473 mx LL 7400y 63N ZI DI L2 FBI FRIO7 02 FRIO7 R
36. if it vibtates severely Irregular sound Click Itis caused by heat expansion and contraction of evaporator shelves and pipes in the refrigerator 1 1 Check time and place of sound Sources 1 Explain the principles of refrigeration and that the temperature difference between operation and defrosting can make sounds 2 If evaporator pipe contacts with other structures leave a clearance between them freezer shroud or inner case SISONSVIG 3 18nou8 L 69 Problems Causes Checks Measures Remarks Sound Popping It happens when refrigerant expands at the end of capillary tube Check the sound of refrigerant at the initial installation Check the sound when the refrigerator starts operation after forced defrosting Check the restrainer attachment conditions on the evaporator and capillary tube weld joints Check the restrainer attached on the evaporator and capillary tube weld joints and attach another restrainer If it is continuous and servere insert capillary tube again depth 15 3mm Fasten the capillary tube to suction pipes or detach in the compressor compartment Explain the principles of freezing cycles Water boiling or flowing sound It happens when refrigerant passes orifice in accumulator internal pipes by the pressure difference between condenser and evaporator Check the sound when compressor is turned on
37. line pipe manually to see if warm Check frost formation on the whole surface of the evaporator Electronic Leak Detector Driver Ruler Compressor compartment and tools arrangeme Remove flux from the silver weld joints with soft brush or wet rag Flux may be the cause of corrosion and leaks Clean R134a exclusive tools and store them in a clean tool box or in their place Copper brush Rag Tool box Transportation and installation Installation should be conducted in accordance with the standard installation procedure Leave space of more than 5 cm 2 inches from the wall for compressor compartment cooling fan mounted model Ts TROUBLE DIAGNOSIS 3 3 Precautions During Heavy Repair ltems Precautions 1 Use of tools 1 Use special parts and tools for R134a 2 Recovery of refrigerant 1 Continue to recover the refrigerant for more than 5 minutes after turning the refrigerator off 2 Install a piercing type valve on the high pressure line drier side Then use the appropriate recovery equipment to recover the refrigerant from the system When the refrigerant has been recovered install a piercing type valve on the low pressure side IT IS IMPORTANT TO OPEN THE SYSTEM IN THIS ORDER TO KEEP THE OIL FROM BEING FORCED OUT The use of piercing type valves will allow future servicing and eliminates the possibility of a defective pinch off Evaporator
38. out it could create a fire or safety hazard If it s warm OK If it s not condenser discharging line weld joints might be clogged Discharge the system and recover the refrigerant Then use a torch to disconnect unbraze the piping to repair the obstruction Repair evacuate the system and recharge it before testing Direr must be replaced Leak at loop pipe weld joint discharge in compressor Check sequence 1 Manually check whether condenser is warm It is not warm and the frost forms partly on the evaporator in the freezer compartment Replace the compressor weld evacuate and recharge refrigerant Drier must be replaced Faulty cooling fan in the compressor compartment Check sequence 1 Check cooling fan operation 2 Check that cooling fan is disconnected from the motor Replace if motor does not operate If fan is disconnected check fan damage and reassemble it Refer to fan motor disassembly and assembly sequence SISONSVIG 3 18nou8 L 9 2 5 Defrosting failure Problems Causes Checks Measures Remarks No defrosting Heater does not generate heat as the heating wire is cut or the circuit is shorted 1 Heating wire is damaged when inserting into the evaporator 2 Lead wire of heater is cut 3 Heating wire at lead wire contacts is cut Check the resistance of heater 00 Short Q Cut Tens to thousands Q O
39. purchase ON shipping a Wh en Sequence of 03 FROST 03 FROST 6 0 DAMPER 03 DAMPER fa POWER sec REMOVAL sec REMOVAL ses amp load operation HEATER HEATER gt DUCTDOOR gt DUCTDOOR when closing sensor becomes ON amp OPTICHILL amp OPTICHILL FREEZER and less than 45 C ON OFF HEATER ON HEATER OFF REFRIGER In power failure ATOR service 0j PIPE PIPE 03 03 03 0 3 OPTICHILL sel amp sec amp COMP sec FFAN coc R STEP sec STEP gt DISP DISP gt gt 18 gt MOTOR DAMPER HEATER HEATER ON C FAN DAMPER MOTOR ON OFF ON ON ON Test mode 1 If you press the PTICHILL itch i Manual function TEST OTHER OQ FFAN RSTEP 03 OPTICHLL switch in the SWITCH LOAD sec MOTOR sec DAMPER again test mode 2 PRESS Fan DAMPER gt MOTOR or temperature of gt Once ON CLOSE a frost removal 2 sensor is more than 5 C it Test mode 2 immediately 03 03 03 retums to the test Manual frost TEST COMP F FAN FROST R STEP mode for initial removal SWITCH n 80 amp 59 REMOVAL Se MOTOR PRESS OFF C FAN HEATER DAMPER operation 2 Times OFF ON CLOSE COMPRESSOR operates after 7 minutes 47 MICOM FUNCTION 2 15 Failure Diagnosis Function 1 Failure diagnosis facilitates service when a failure code shows during pro
40. reverse order of the disassembly and take special care for the following details 1 Be careful not to bend the tube during assembly 2 Press the WATER DISPENSER button until water pours out and check for leakage in the CONNECTOR TUBE It differs by the water pressure but usually takes about 2 minutes until water pours out 96 HOW TO DISASSEMBLE AND ASSEMBLE 6 DISPENSER 1 Disconnect funnel and button assembly by pulling down and forward 2 Remove display frame assembly by making a gap between a display frame assembly and door with a flat blade screwdriver and pulling it forward The cover dispenser is attached with a hook 3 The display assembly can be connected by pressing the top of the dispenser cover and pushing it after separating the display frame from its housing 4 Loosen four screws with a phillips screwdriver and pull the funnel assembly to disconnect Funnel Assembly Funnel Assembly 5 The duct cap assembly can be disconnected if the hold lever connecting screw is loosened with a phillips driver Solenoid Assembly Duct Cap Assembly 6 To install the duct cap assembly insert one end of the spring into the right hole of the dispenser lever and insert the other end into the right hole in the top part of the dispenser Then attach the holder at the solenoid switch 97 HOW TO DISASSEMBLE AND ASSEMBLE 7 Dispenser Related Parts
41. sensor shall be measured with a digital tester after separating of the PWB ASSEMBLY and the MAIN part 35 EXPLANATION FOR MICOM CIRCUIT 1 14 OptiFresh stepping MOTOR Display 1 GR G277STSA LSC27990TT i CONS i aM on MA VOPTI FRESH NE ORE LF NM A MAGIC OF lt i A STEPPING PIA B MOTOR 1 1 ds _____ 6 Rt A 1 30 1302 1303 R301 lt PI7 gt 3 470 1 4W Mo CO L i E P 1 1 OPTION 3 36 EXPLANATION FOR MICOM CIRCUIT 2 PWB parts diagram and list 2 1 PWB Assembly main part diagram 1 GR G277STSA LSC27990TT 000000000000 e 6871JB1440L 14410 O usui Tuve O EXPLANATION FOR MICOM CIRCUIT 2 2 Parts list 1 GR G277STSA LSC27990TT DESCRIPTION SPEC MAKER 1 PWB PCB BICS PJT BICS2I PJT_DLX 000 SAN z PrE 00 SAN 3 AM 4 SAM IL 5 ma 6 Mees P MOE OA TE ZAE YEON UIAVUP 2 4 F
42. servicing and eliminates the possibility of a defective pinch off 2 Nitrogen blowing welding Evaporator KEY POINT Welding without nitrogen blowing produces oxidized scales inside a pipe which affect performance and reliability of a product Hot Line 0 J High pressure side Refrigen Condenser Intake When replacing a drier Weld and 2 parts by blowing nitrogen 0 1 0 2kg cm2 to high pressure side after assembling a drier When replacing a compressor Weld and 2 parts by blowing nitrogen to the low pressure side Note For other parts nitrogen blowing is not necessary because it does not produce oxidized scales inside pipe because of its short welding time 3 Replacement of drier KEY POINT Be sure to check the inserted length of capillary tube when it is inserted If inserted too far the capillary tube will be blocked by the filter Inserting a capillary tube Measure distance with a ruler and put a mark 12 3 0 on the capillary tube Insert tube to the mark and weld it 79 TROUBLE DIAGNOSIS Items Precautions 4 Vacuum degassing Evaporator Suction pipe D lt Hot Line Compressor Condenser Low pressure High Blue pressure Yellow SZ A KEY POINT If power is applied NY during vacuum degassing vacuum degassing shall be more effective Run the compressor Connec
43. 1017 Resistor J 4 7K9 5 0603 RC1608J472CS 9 39 02011026 Resistor J 10 9 5 0603 RC1608J103CS 26 40 02011028 Resistor J 15KQ 5 0603 EA 2 41 A02011031 Resistor J 20 9 5 0603 RC1608J203CS EA 1 42 02011033 Resistor J 22KQ 596 0603 RC1608J223CS EA 2 43 A02011041 Resistor J 47 9 5 0603 1 44 02011045 Resistor J 62KQ 5 0603 RC1608J623CS 3 45 02011046 Resistor J 75 9 5 0603 EA 1 46 A02012001 Resistor J 100K9 5 0603 EA 1 40 EXPLANATION FOR MICOM CIRCUIT 47 02012003 Resistor J 120 9 5 0603 RC1608J124CS EA 48 A02012006 Resistor J 270 9 5 0603 49 02012009 Resistor J 510KQ 576 0603 EA 50 A02012011 Resistor J 1 9 5 0603 RC1608J105CS EA 2 51 A02012024 Resistor J 200KQ 5 0603 EA 52 A02012034 Resistor J 360KQ 5 0603 EA 53 A02021028 Resistor F 20 9 1 0603 RC1608F2002CS EA 54 A02021039 Resistor F 60 4KQ 196 0603 RC1608F6042CS EA 55 A02022020 Resistor F 820 9 1 0603 RC1608F8203CS EA 56 A02022037 Resistor F 560 09 1 0603 EA 6 57 02022038 Resistor F 330 9 1 0603 EA 2 58 A02031007 Chip Resistor Networks 4ARRAY OKQ 4ARRAY RP164PJ103CS EA 3 59 A03012017 STARCAP KORCHIP 0 33F 2 5V SCDM2R5334 EA 1 60
44. 20 cc 1771 mm 6911 46 in 1741 5 mm 681 2 in Front View 1746 5 mm 683 4 in 908 3911 16 at tl E S O 00 OS SE gege SEBE Y 1771 mm 6911 1 in Top View PARTS IDENTIFICATION 1 Ref No GR G277STSA LSC27990TT Frame Display Dispenser Lamp Ice amp Water Dispenser Button Automatic Icemaker Lamp Shelf Drawer Door Rack Drawer Door Rack Lower Cover PWB Cover Freezer Refrigerator Compartment Compartment OptiFresh Display Humidity Switch Water Tubes Dairy Product Corner Water Filter Lamp Shelf Shelf Snack Drawer Door Rack Lamp Bottle Guide Vegetable Drawer OptiFresh Door Rack HOW TO INSTALL REFRIGERATOR 1 How to Adjust Door
45. 5 68 1 4W 3XK IN RA z n Zar 250V 5A S FY 275 STR 66351 IMP87C84IN ICI 8 Yoref x 20 T T Vss Voss FUSEI 250 26 TEST GND 15 28 4 42 47 48 YN TOSHIBA TABIINI TABZIL 2 _ 22 EXPLANATION FOR MICOM CIRCUIT 1 2 Oscillation circuit The oscillation circuit generates a basic clock signal for synchronization and time calculation related to the transmission of data and calculations made by the MICOM IC1 The oscillator OSC1 must always be replaced with an exact replacement part If this specification is changed the change will affect the time calculations of the MICOM and it might not work at all 1 GR G277STSA LSC27990TT pm T 30 xw CSTS4 00M603 XOUT Fo RI3 IM 3l 1 3 Reset circuit The RESET circuit allows various parts of the MICOM such as RAM defrosting etc to be restarted from the initial state when power is interrupted or restored A LOW signal applied to the reset terminal for 10 ms causes the MICOM to reset itself During normal operation the voltage at the reset terminal is 5 Vdc If the reset fails the MICOM will not operate 1 GR G277STSA LSC27990TT
46. A LG 24 SBS 12mm 17 ASS LG 24 oH HE EA 3 08 18080008 4 7 SWITCH LG 2A CH SSS 12mm 57 ASS LG 24 oH E EA 1 09 A60010028 PROGRAM OS WIN CE 4 2 CORE LIC WIN CE LIC LABEL EA 1 41 EXPLANATION FOR MICOM CIRCUIT 2 4 DISPLAY circuit diagram 1 GR G277STSA LSC27990TT ARM920T Instruction Instruction External MMU CACHE Coproc 16KB Interface JTAG ARMSTDMI AMBA Processor core Bus Internal EMbedded ICE Lnf Data WriteBack Data CACHE PA Tag MMU 16KB RAM LCD LCD BUS CONT CONT lt A Arbitor Decode USB HOST CONT lt gt lt gt interrupt CONT ExtMaster lt gt Power 1M BOOT ROM i Mabagement NOR FLASH NAND CONT 128M NAND s NAND Flash Boot lt gt Memory CONT FLASH Loader gt sRAM NOR SDRAM PAMSRRAM em Clock Generator lt Clock Generator ji MPLL UPLL MPLL UPLL Serial Comm Uart0 PIC MICOM Uart1 PCB UART 0 1 2 lt 12C 8 Key Uart2 Home Net Touch Button SW amp LED USB Device lt gt lt gt 128 bee A Buzzer USB HOST SD MMC lt lt G
47. A01070056 Switching Diode ROHM 155380 5 79 14 01070058 7 DIODE ROHM UDZS 7 5 SC 76 3 15 A01080002 LED 0805 LED GREEN SML 210MTT86 EA 16 A01080030 LED 0805 LED WHITE EA 17 17 A01090005 SWITCHING POWER LM2653MTCX ADJ EA 18 A01090079 REGULATOR AS1117 1 5V SOT223 SPX1117 1 5V EA 19 A01090106 REGULATOR NATIONAL LP3965EMP ADJ SOT223 5 EA 20 A01090128 REGULATOR ST LD1117S33TR SOT223 EA 21 A01090129 REGULATOR ST LD1117S18TR SOT223 EA 22 A01110062 MEMORY SDRAM HYNIX SAMSUNG HY57V561620CT H K4S561632C TC75 EA 2 23 A01110081 MEMORY NOR FLASH ST M29W800DB70N6 TSOP48 EA 24 A01110084 MEMORY NAND FLASH SAMSUNG K9F1GO8U0M PCBO TSOP48 EA 25 A01140017 ZVS CCFL CONTROLLER BITECH BIT 3105 SSOP20 EA 26 A01140025 RS 232 INTERSIL HIN213ECAZ T Pbfree amp EA 27 01150055 TOUCH SENSOR AD 4 TS01 SSOT6 EA 8 28 A02010001 Resistor J 09 5 0603 RC1608J000CS EA 12 29 A02010014 Resistor J 229 596 0603 RC1608J220CS EA 20 30 02010032 Resistor J 1002 5 0603 RC1608J101CS EA 31 02010034 Resistor J 1509 5 0603 17 32 02010038 Resistor J 2209 5 0603 RC1608J221CS 33 A02010044 Resistor J 3309 5 0603 RC1608J331CS EA 34 A02010049 Resistor J 4709 5 0603 RC1608J471CS EA 35 A02010057 Resistor J 8209 5 0603 36 02011001 Resistor J 1 9 5 0603 RC1608J102CS 1 37 02011003 Resistor J 1 2K9 5 0603 RC1608J122CS 38 0201
48. A03021005 Aluminum Electrolytic CAP 47uF 16V 6 30 SC1C476M6L005VR100 EA 1 61 A03022001 Aluminum Electrolytic CAP 00 4 16 6 3 SC1C107M6L005VR259 EA 3 62 A03022002 Aluminum Electrolytic CAP 330uF 16V 86 GC1C337M08010VR100 EA 2 63 A03022014 Aluminum Electrolytic CAP 220uF 16V 6 39 CK series EA 3 64 A03031009 Tantal CAP OuF 16V A EA 21 65 A03031037 Tantal CAP 448717 OuF 10V P TCSCS1A106MPAR EA 4 66 A03032001 Tantal CAP 00uF 16V D EA 1 67 A03040007 amp il A 0603 5pF 0603 CL10C150JB8NNNC EA 2 68 03040012 E zi el 1 0603 22pF 0603 EA 2 69 A03040017 amp zie A 0603 33pF 0603 EA 2 70 A03040024 4 zl 0603 00pF 0603 CL10C101JB8NNNC EA 3 71 03040030 44 2G 4 0603 220pF 0603 EA 1 72 A03040043 ZAIZ 0603 2pF 0603 EA 10 73 A03040052 el 1 1808 5pF 3KV 1808 302R29N5ROCV4E EA 1 74 A03041005 9 1 0603 2 2nF 0603 CL10B222KB8NNNC EA 1 75 A03041007 amp zi el M1 0603 2 7nF 0603 CL10B272KB8NNNC EA 1 76 A03041012 amp Z H14 0603 OnF 0603 CL10B103KB8NNNC EA 12 77 A03041018 4 ell A1 0603 47nF 0603 CL10B473KA8NNNC EA 3 78 A03041021 zi ell 1 0603 00nF 0603 CL10F104ZA8NNNC EA 42 79 A03041022 ell A 0805 00nF 0805 CL10F104Z08NNNC EA 80 A03042001 8 AJ 0603 1uF 0603 CL10B223KB8NNNC EA 14 81 A03042012 amp ZUA 1206 TDK OuF 1206 16V Y5V C3216Y5V1C1062Z EA 82
49. A03042013 amp Al2rg ZUA 1206 TDK 4 7uF 1206 25V Y5V C3216Y5V1E475Z EA 83 A04010001 BFR601009C8MGH EA 84 A04020015 Chip Ferrite Bead CERATECH 209 2 0805 HH 1M2012 121JT EA 1 85 A04040010 Chip Coi DO3316P 223 22uH 2 6A EA 86 A04050006 TRANS RANS UI 8 5mm EA 87 A05010001 CRYSTAL RALTRON SMD 32 768KHz SERIES RSM200S EA 2 88 A05010004 CRYSTAL 12MHz JX 1 SMD JTC JX 1 12 20 6E7 EA 89 A05010030 CRYSTAL 9 8304MHz HC49S SMD EA 90 A06030005 PIN HEADER SINGLE ROW Straight PIN Header 4P 1ROW 2 54mm S EA 2 91 A06060003 USB CONNECTOR USB A Type Single shield R A 787616 2 EA 92 A06090032 BUZZER LG BM 20B 4KHZ 85DB EA 93 A06100239 JST CONNECTOR SM02B BHSS 1 TB EA 94 A06100240 4 X CONNECTOR SMAW250 04G EA 95 A06100241 291 E z CONNECTOR FF100 S40B C25 D EA 96 A06100274 9 CONNECTOR SMAW250 03 EA 97 A06100278 CONNECTOR HL2002 S2G N 14PIN 2ROW EA 98 08020139 LCD CABLE FFC LG au 8 40P 40P 40mm 1mm pitch MES 110 LCD CABLE EA 99 A09010060 LCD LG LB040Q02 TD01 4 LCD EA 100 A10010471 PB051206 MES 150 R1 1 Pbfree EA 1 01 12020079 52 HH HZILHA CM2x4x 3 5 BK 4 02 12030029 BOSS BS 10 6 2 zH amp LG 4 03 17020012 JAXA AD 5 5X3 5X5 5 BLOCK EA 4 04 A17020014 22 AD YHT 5 5 2 0 5 5 1 05 17020015 Z JAH AD BHE xl 5 5 3 0 5 5 R EA 3 06 18080006 ELECTRODE AD amp F Al eH E 12mm EA 8 07 A18080007 S 87 SWITCH
50. BLY ASSEMBLY Copper Brazing Copper Brazing Coppper Brazing Silver Brazing 82 TROUBLE DIAGNOSIS 4 HOW TO DEAL WITH CLAIMS 4 1 Sound Problems Checks and Measures Hiss sounds E Explain general principles of sounds All refrigerators make noises when they run The compressor and fan produce sounds There is a fan in the freezer compartment which blows cool air to freezer and refrigerator compartments Hiss sounds are heard when the air passes through the narrow holes into the freezer and refrigerator compartments Cooling Fan sound in the compressor compartment There is a fan on the back of the refrigerator which cools the compressor compartment If there is a small space between the refrigerator and the wall the air circulation sounds may be noticeable Compressor Noise This operating sound happens when the compressor compresses the refrigerant The compressor rotates at 3600 RPM The sound of compressor Bigger refrigerators make more noise than small ones Click sounds E Explain the principles of temperature change The sounds happens when pipes and internal evaporator in the refrigerator compartment expand and contract as the temperature changes during the refrigerator operation This sound also happens during defrosting twice a day when the ice on the evaporator melts Clunk sound E Explain that it comes from the compressor when the refrigerator starts When the refr
51. DEFECT HOOKED OF LEAD 6 EDO MAE ERING Er FF WIRE TO FAN CONTACT OF OFF STRUCTURES WITH FAN SHORT OR OPEN OF LEAD WIRE THERE IS NO SIGNAL OF BLDC MOTOR MORE 7 pes MA COOLING Er CF THAN 115 SECONDS IN OPERATION O STANDARD RPM OFF OF FAN MOTOR SHORT OR OPEN OF LEAD WIRE ABNORMAL CONNECTING BETWEEN MAIN PCB 8 COMMUNICATION Er CO AND DISPLAY PCB TRANSMISSION STANDARD RPM O O O TR AND RECEIVING PART ABNORMAL AMBIENT SENSOR SHORT 9 AMBIENT SENSOR NORMAL DISPLAY NOTE 1 See page 19 CIRCUIT O O O O ABNORMAL WATER TANK SENSOR 10 WATER TANK SENSOR NORMAL DISPLAY NOTE 2 See page 19 sHORT CIRCUIT O O O O ABNORMAL OPTICHILL SENSOR 11 opTicHILL sensor NORMAL DISPLAY NOTE2 See page 19 SHORT CIRCUIT 18 MICOM FUNCTION ALL DISPLAY PARTS TURN OFF OTHER THAN FREEZER ROOM NOTCH TEMPERATURE DISPLAY AND IN CASE OF INDICATING FAILURE MODES EXCEPT FOR NOTE1 NOTE2 NOTE1 FREEZER ROOM NOTCH TEMPERATURE DISPLAY AND REFRI AMBIENT SENSOR AND Er INDICATED ON THE AMBIENT TEMPERATURE DISPLAY EXCEPT FOR THE AMBIENT TEMPERATURE DISP NOTE 2 R2 SENSOR WATER TANK SENSOR AND OPTICHILL SENSOR IS NOT INDICATED ONTI WHEN PRESSING THE TEMPERATRUE AND cQ gt BUTTON IN THE LOCK STAT NORMAL DISPLAY PART GRAPH 77 ABNORMAL DISPLAY PART GRAPH NORMAL DISPLAY PART GRAPH ABNORMAL DISPLAY PART GRAPH r NORMAL DISPLAY PART GRAPH ABNORMAL DISPLAY PART GRAPH WATER
52. DIO 6 BLOCK DIAGRAM E NI OV INV OlQVvH Al 2H09 0S AO0v2 001 OV 9914 INAUI Sdi
53. E SLOW 250 V 5 2520 LD GL UL 7 5 SAM LI FUSEZ 3024470 FUSE DRAWING 250V EF Saw JU FUSE 21 650 ER00 A ASSEMELY KORE PIT 5 U FUSE HOLDER 38 EXPLANATION FOR MICOM CIRCUIT DESCRIPTION REMARK 143 4920 E3007A HEAT SINK 65 73 PN 1 5 3 4 TAE SUNG uc 8 0 2 i SOLOER IROSIN WIRED 146 SSWZU LOSAA am HI SUNG m CONNECTOR CIRC WAFER WING TEZ 0122 8208 0 1 39 EXPLANATION FOR MICOM CIRCUIT 2 3 DISPLAY ASSEMBLY part diagram 1 GR G277STSA LSC27990TT 1 A01010088 32BIT RISC MICROPROCESSOR SAMSUNG 3C2410A20 YO80 EA J 2 01030086 TTL IC 5014 74LV14D EA 3 A01040024 PIC MACROCHIP PIC18F2520 8028 LG aut EA 4 A01050043 MOSFET SWITCH 13861DV SSOT6 EA 5 A01050046 POWER MOSFET ADV POWER 9930M SO8 EA 6 A01060002 TRANSISTOR PNP ONSEMI MMBT3906LT1 SOT23 EA 7 A01060003 TRANSISTOR NPN ONSEMI MMBT3904LT1 SOT23 EA 8 A01060029 TRANSISTOR PNP KRA106S SOT23 EA 9 A01060030 TRANSISTOR NPN KRC106S SOT23 EA 10 A01070002 DIODE LL4148 GS08 MELF EA 11 A01070007 DIODE BAT54S EA 12 01070015 DIODE ONSEMI MBRO0520L 3 1 EA 13
54. ED YEON HD P 6 8 YEON HO 9 YES 24 6 0 VED YEON HO 1746062 2 14 2 5MM STRAIGHT SN RED 1746062 1 4P 2 5MM STRAIGHT SN 3 9 7790 1 12 2 3M STRAIGHT SN 917791 1 13 2 5 STRAIGHT SN 5 6635 SP ST 12 3 PS2561 NEC 4P DIP EK TLP72IF IC3 8 7 3 PIN TP CHANG JIANG CHANG JUNG 5 TOS TAPPRE TRAY TS 20 KIA7042P EK RESET KEC 9 2 TA7774AP 16 501 EK DRIVE IC STEPPING MOTOR TOSHIBA 0 22 __01T0777400A TA7774AP 6 SDIP EK DRIVE IC STEPPING MOTOR TOSHIBA ICI M ROOM JA ALEISBIZ ZSOVAC IZVDC TA NO VENTING MATSUSHITA a 65 6 1 250 16 I2VDC IA NO VENTING OMRON RYL COMP 6920 82005 OHIU 1 DEC 250 16 IZVOC VENTING DAIICHI 241 GSZOALZOQIA MATSUSHITA IRYZ IFCRAVPT 2 Q A MATSUSHITA RYG DEF RI MATSUSHITA 5 RIS RIB ALDI MATSUSHITA 250 A MATSUSHITA 65 1 250 5 IZVOC OMRON a 8 250 IZVDC IA NO VENTING OMRON RY4 9 10 11 13 ICENB A E CHINA 250VAC IZVDC IA NO VENTING OMRON PCJ 120MH CHINA 250VAC IZVOC VENTING TYCO 6558 14 OMRON ZZIOVAC SA IZVDC IC ND VENTING ia 6558 14 OMRON 250VAC IZVOC IC NO VENTING OAN RY ALEISRI2 MATSLEHITA 2 IGA L2VOC
55. EXE REFRIGERATOR CAUTION PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS MANUAL BEFORE CHECKING OR OPERATING THE REFRIGERATOR MODEL LSC27990TT COLOR TITANIUM CONTENTS WARNINGS AND PRECAUTIONS FOR SAFETY rie ci eee eroici 3 SPECIFICATIONS 4 PARTS IDENTIFICATION m 5 HOW TO INSTALL THE REFRIGERATOR I U 6 HOW TO ADJUST DOOR HEIGHI neret ertet iatale iens 6 Burg S 7 HOW TO CONTROL THE WATER SUPPLY u uuu tert ao deed 8 MICOM FUNCTION 9 EXPLANATION OF MICOM 1 u iene 22 EXPLANATION OF PWB CIRGUIT Reale 22 PWB PARTS DIAGRAM AND remite dete li 37 PWB GIRGUIT DIAGRAM Em 43 AND DISPENSER WORKING PRINCIPLES AND REPAIR 45 WOHBKING PRINGCIBEES eI Ee but itae e HA a POR isti 45 FUNCTION OF ICEMAKER ss rr deri 46 CIRCUIT eine 48 TROUBLE DIAGNOSIS scia 49 TR
56. Harvest Mode 1 Harvest Ice removing refers to the operation of dropping cubes into the ice bin from the tray when icemaking has completed 2 Harvest mode 1 The Heater is ON for 30 seconds then the motor starts 2 After performing Step 1 the Heater is turned OFF the Ejector will be back in place wthin 18 minutes Hall SENSOR sign OV Ice removal is then complete Then the Icemaker cycles to the Fill Mode The water supply fails to start it is not functioning Put the Heater and Motor in the off position Restart every 2 hours Refer to fig 1 2 4 Fill Park Position 1 Once a normal harvest mode has been completed the water solenoid will be activated 2 The amount of water is adjusted by pressing the Fill Key repeatedly This changes the time allowed for fill as illustrated in the table below Water supply amount TABLE STAGE TIME TO SUPPLY INDICATIONS REMARKS 1 5 sec EI The water amount will vary depending 2 5 5 sec on the water control switch setting as FIRST STAGE well as the water pressure of the connected water line EI 3 6 sec 46 ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 2 5 Function TEST 1 This is a forced operation for TEST Service cleaning etc It is operated by pressing and holding the Fill Key for 3 seconds 2 The test works only in the Icemaking Mode It cannot be entered from the Harvest or
57. IAGNOSIS FUNCTION 3 1 ERROR CODES shown on Icemaker water supply control panel NO DIVISION INDICATOR CONTENTS REMARKS Mark time to Display switch 1 Normal supply None operates properly Icemaking Make sure that the wire 2 Sensor Open or short circuited wire on each sensor is malfunction connected ERROR indicators in table can be checked only in TEST mode 47 CIRCUIT 1 GR G277STSA LSC27990TT CIRCUIT DIAGRAM DELUXE H PART H BAR HEATER DOOR S W CAPACITOR PART PLUG TYPE COMPRESSOR EARTH PART P T C ASSEMBLY ON CIRCUIT DIAGRAMS ARE SUBJECT TO CHANGE DIFFERENT LOCALITES AND ACCORDANCE WITH MODEL TYPE FUSE PART APPLICATION OPTIONA N NEUTRAL PWB ASSEMBLY MAIN FUSE 100 127V 220 240 FUSE PART NO FUSE 250VAC 15 F FAN 4 YL 3 M MOTOR BLDC F zBL Suv aL PIPE HEATER C FAN MOTOR BLDC CONS lay 1 LIL F DOOR OPEN PERCEPTION BN DISP HEATER TT DEFROST SENSOR BLIN DEF HEATER FUSE MELTING 72 C i9 E mE 25 co z N on F m E F SENSOR BL WH PR UL ERE GRD OPTI FRESH F DOOR DISPLAY d swatch RD loro 1 TV TV POWER ICE MAKER KIT DISPENSER
58. K 2 Check the resistance between housing terminal and heater surface 00 Short 0 Cut Tens to thousands Q Short Heating wire is short and wire is cut Parts replacement Refer to parts explanations Seal the lead wire with insulation tape and heat shrink tube if the cut lead wire is accessible to repair Suction tube and discharge orifice 1 Impurities 2 Ice Confirm foreign materials In case of ice insert the copper line through the hole to check 2 Put hot water into the drain check drains outside 1 Push out impurities by inserting copper wire Turn off more than 3 hours and pour in hot water if frost is severe 2 Put in hot water to melt down frost 3 Check the water outlet 4 Push the heater plate to suction duct manually and assemble the disconnected parts Gap between Suction duct and Heater plate Ice in the gap 1 Confirm in the Suction duct 1 Turn off the power confirm impurities and ice in the gap and supply hot water until the ice in the gap melts down 2 Push the Heater plate to drain bottom with hand and assemble the disconnected parts Wrong heater rating or wrong assembly 1 Check heater label 2 Confirm the capacity after substituting the resistance value into the formula P _V V Rated voltage of user country R Resistance of tester Q Compare P and lavel capacity Tolerance 7 Faults Replace How
59. LL OPERATE STATUS MODE 2 STATUS RETRUINGITO INITIAESTATUS AFTER DELAY FOR 7 MINUTES LCD check function If simultaneously pressing TEMPERATURE and 4 P button for a second the lock status a back light is turned on and all display LCD graphics on If releasing the button the LCD graphic displays the previous status 19 MICOM FUNCTION 2 16 Test Function 1 The test function assists in diagnosing the PWB and determining the exact mode of failure 2 The test button is on the main PCB When test mode is engaged it will complete its test cycle and default to normal operation within 2 hours 3 The buttons are disabled while the test mode is in effect 4 When you have finished running test mode unplug the refrigerator to reset it to normal operation 5 If a failure is detected during test mode release the test mode to display the failure code 6 If a failure code is displayed the test mode cannot be started Mode Operation Contents Remarks Test 1 Press test button once strong cold mode 1 Continuous operation of compressor 2 Continuous operation of freezing BLDC motor high speed RPM and cooling BLDC motor 3 Defrost heater turns off 4 Stepping motor damper is completely opened baffle is closed 5 OptiFresh stepping motor damper is completely closed 6 AII display LCD graphics turn on Freezer fan turns off when door is opened Test 2 Press test button
60. OUBLESHOOTING apo iiaeaa GRA En ee 49 59 COOLING CYCLE HEAVY REPAIR oa aaa MEM eR 76 HOW TO DEAL WITH CLAIMS u ede et Ue 83 TV RADIO 88 SAFETY PRECAUTIONS tiep RR TIE Id meris Rte D prid 88 FEATURE gt il lidia ii i comm ocu LAM 88 CONTROLS cilea aaa P ier eite iui 89 REMOTE CONTROL KEY FUNCTIONS eren nennt LR 90 TROUBLESHOOTING ite rnt t ei et et 91 BLOCK DIAGRAM m 92 TV PART BISASSEMBDLE 3 eei Eee te ERE ia 93 HOW DISASSEMBLE AND ASSEMBILE 94 DOOR PER 94 RANDLE S S onte cM E eret 95 FANSSHROUD GRILUE L L Qs pe erre a diem aimer d estende iE eei abis 95 WATER VALVE DISASSEMBLY METHOD erret aa ein 96 FAN and FAN MOTOR DISASSEMBLY METHOD 96 DISPENSER 97 EXPLODED VIEW e EE 99 REPLACE PARTS LIST anao niin nh ERR u u u ai 106 WARNINGS AND PRECAUTIONS FOR SAFETY Please observe the follow
61. PIO On Off Memory Stick B Watchdog Timer B RIG U BUSCONT lt gt ADC Watch Arbitor Decode Timer PWM SPI 0 1 lt gt 0 3 4 interanl 100msec 1msec Backlight Buzzer timer timer Inverter PWM Freq 42 EXPLANATION FOR MICOM CIRCUIT 3 PWB Circuit Diagram may vary by model 1 GR G277STSA LSC27990TT TOSHIBA TMPB7CBAIN ICI CAVE 7 Fo z 2 OF HEATER i z x ler NT i joo KN DI meum SR 8 E sekfe B cx eo MAROON RON LESS 2 43 EXPLANATION FOR MICOM CIRCUIT i UL g OUCT I AT SENSOR DISPENSER LIGHT SR BICSZ60E OPTION 1 3 am
62. TANK SENSOR OPTI FRESH SENSOR R2 SENSOR MIDDLE ROOM IGERATOR ROOM NOTCH TEM REFRIGERATOR ROOM NOTCH TEMPERATURE DISPLAY FAILURE CODE INDICATION PART PERATURE DISPLAY FAILURE CODE INDICATION PART ARE NORMALLY INDICATED IN ABNORMAL LAY OTHER DISPLAY PARTS ARE INDICATED NORMALLY HE FAILURE INDICATING PART BUT INDICATED IN CHECKING ALL DISPLAY PARTS US FOR MORE THAN 1 SECOND C ON THE PART TURNS ON ON THE PART TURNS OFF ON THE PART TURNS ON C ON THE D PART TURNS OFF C ON THE PART TURNS ON C ON THE PART TURNS OFF THE OTHER DISPLAY GRAPHICS TURN ON 2 TEST FUNCTION TEST KEY EXISTS ON PWB ASSY MAIN BOARD MODE OPERATION CONTENTS REMARKS e 1 CONTINUOUS OPERATION OF COMPRESSOR 4 MAIN STEPPING MOTOR DAMPER IS COMPLETELY 52 2 CONTINUOUS OPERATION OF FREEZING BLDC MOTOR OPENED OPEN OF BAFFLE FREEZING FAN TURNS OFF lt gt HIGH SPEED RPM AND COOLING BLDC MOTOR 5 ALL DISPLAY GRAPHICS TURNS ON IN DOOR OPENING 3 DEFROST HEATER TURNS OFF 1 COMPRESSOR OFF 4 MAIN STEPPING MOTOR DAMPER IS COMPLETELY RETURN TO THE NORMAL TESTS TEO ONSE AIME EST 2 FREEZING BLDC MOTOR AND COOLING BLDC MOTOR CLOSED CLOSING OF BAFFLE MODE WHEN THE SEOHCEDDEEROSTMODES TURN OFF 5 ALL DISPLAY GRAPHICS TURNS OFF ONLY FAILURE CODE DEFROST SENSOR IS 3 DEFROST HEATER TURNS ON INDICATION PART TURNS ON FOR 22 STATUS ABOVE 5 C NORMAL PRESS TEST BUTON ONCE AT THE TEST COMPERSSOR WI
63. actory CUT 6 6 6 1 C 1 8 F CUT 6 6 1 1 8 F 6 CUT 5 1 C 1 8 F 6 5 CUT 1 1 8 F CUT CUT f 5 2 3 6 F 5 CUT CUT 2 C 3 6 F CUT 6 CUT 0 C 0 F CUT 6 CUT 0 C 0 F 6 CUT CUT 6 d 0 C 0 F CUT NES CUT 0 0 F CUT CUT CUT 1 1 8 6 CUT CUT CUT 1 C 1 8 F CUT CUT CUT CUT 0 0 F gt This circuit allows adjustment of the set temperature for compensation by changing jumpers at locations JCR1 JCR4 33 EXPLANATION FOR MICOM CIRCUIT 1 13 Communication circuit and connection L Wire between main PCB and display PCB The following communication circuit is used for exchanging information between the main MICOM of the Main PCB and the dedicated MICOM of the LCD Display PCB A bi directional lead wire assembly between the two boards is required for the display to function properly Poor communication occurs if a continuous information exchange fail to continue for more than 2 minutes between main MICOM of main PCB and LCD dedicated MICOM for LCD control of display PCB Main PCB 1 GR G277STSA LSC27990TT MICOM PAI LWire FD H 4 wires Display PCB TEMPERATURE DISPENSER ala JA 37 F 4 y zr
64. aired 3 Overcooling in the refrigerator compartment Faulty damper in the refrigerator compartment Faulty MICOM faulty sensor Check if refrigerator compartment is overcooled when button pressed on weak Check parts are faulty Replace faulty parts 4 Bad defrosting Heater wire is cut Defective defrost sensor Defrosing cycle Check for frost on the evaporator after dissembling shroud and fan grille Check for ice on intake port of freezer and refrigerator compartment Check parts related to defrosting Check defrosting Check ice on the evaporator and pipe Moisture does not freeze on the evaporator but can be sucked into the refrigerator where it condenses and freezes This interferes with cold air circulation and sublimation of the ice 5 Customers are not familiar with this machine Door opens High temperature high moisture and high load Check if food interferes with door closing Check for ice on the ceilings Read the manual and become familiar with the operation of the product SISONSVIG 21 1 99 Problems Causes Checks Measures Remarks Ice in the freezer compartment Surface of fan grille Wall of freezer compartment Cool air discharging port Basket rack area Food surface lcing in the shute 1 Bad cooling air circulation Intake port is
65. arts whenever total operation time of compressor becomes 4 4 hour 3 Defrost is completed if temperature of a frost removal sensor becomes more than 5 C after starting frost removal Poor frost removal is not displaced if it does not arrive at 5 C even if two hours have passed after starting frost removal 4 No defrost cycle is run if the defrost sensor fails 2 13 Refrigerator room lamp automatic off Refrigerator room lamp turn on and off by refrigerator door switch If refrigerator room lamp continuously turns on more than 7 minutes the refrigerator room lamp turns off automatically 16 MICOM FUNCTION 2 14 Sequential operation of components Component products such as compressor frost removal heater freezing room fan cooling fan and step motor damper are sequentially operated as follows for preventing noise and part damage occurred due to simultaneous operation of many parts in applying initial power and completing test Function Load Operation Sequence Remark When temperature If error occurs of a frost removal _ OPTICHILL during operation POWER MP F FAN 03 R STEP 03 g Op 9 se 50 amp sec MOTOR sec DELE initial operation is more than 45 C CFAN DAMPER gt not done ON ON ON MOTOR At
66. ation to be pumped in The holes allow the air to be expelled so there are no bubbles Electric bills are too much W If the electric bill seems high make sure the refrigerator is the cause rather than a general increase in the cost of electricity This refrigerator may be larger than your previous refrigerator and therefore require more power Condensation on the inside wall of the refrigerator compartment and the cover of properly vegetable drawer Explain how to store foods e Condensation forms when refrigerator is installed at damp area door is frequently opened and wet foods are not stored in the air tight container or wrapped Be sure to store wet foods in airtight containers or securely covered in plastic wrap When is the power connected When should the power be connected You can connect the power immediately after installation However if the refrigerator was laid flat before or during installation you must stand it upright for 6 hours before plugging it in This allows the refrigerant oils to return to the sump in the compressor If you operate the refrigerator before the oil has had a chance to settle you could damage the compressor Door does not open properly The front should be a little bit higher than the rear W Refrigerator compartment door does not open properly e When the door is opened warm air goes inside the refrigerator When it cools it creates a sl
67. d deformation Problems Causes Checks Measures Remarks High Poor cool air circulation due to faulty Lock Check resistance with a Replace fan motor temperature fan motor tester in the freezer 0Q short compartment Q cut Reconnect and reinsert Faulty fan motor due to faulty door switch operation Iced button faulty operation Press button to check Faulty button pressure and contact Press button to check operation Door cannot press door switch button Check visually Confirm icing causes and repair Replace door switch Door sag fix door Door liner bent replace door or attach sheets Poor heat exchange in compressor area Check the clearance between the refrigerator and wall minimum of 4 50 mm Check dust on the grill in compressor compartment Check dust on the condenser coils Keep clearance between refrigerator and walls minimum of 4 50 mm Remove dust and contaminants from grill for easy heat radiation Remove the dust with vacuum cleaner from the coils condenser while the refrigerator is off The fan may be broken of damaged if cleaned while the refrigerator is running SISONSVIG 318nou8 L 9 2 4 Cooling Problems Causes Checks Measures Remarks High Refrigerant leak Check sequence Weld the leaking part recharge the Drier must be replaced temperature 1 Check the welded parts of the refrigerant
68. djustment hinge pin 2 lt Tool for adjustment HOW TO INSTALL REFRIGERATOR 2 Filter Replace the filter when the indicator light comes on or the performance of the icemker or water dispenser decreases noticeably After changing the water filter cartridge reset the water filter status display and indicator light by pressing and holding the FILTER Button for 3 seconds page 13 1 Remove the old cartridge Twist the knob of the cartridge counterclockwise J When the cartridge is removed you will feel it click Pull out the cartridge 7 NOTE There will be some water 25cc in the filter cartridge Some spilling may occur Catch it in a bowl or towel 2 Replace with a new cartridge Take the new cartridge out of its packaging and remove protective cover from the o rings With cartridge knob in the vertical position push the new filter cartridge into the cover until it stops Li If you can t turn the filter from side to side it isn t fully inserted Push it in firmly and twist it into place You will hear the snap when it clicks into place Using the handle twist the cartridge clockwise about 1 4 turn 3 Flush the Water System After Replacing Filter Dispense water through the water dispenser for 3 minutes to purge the system There may be a little air in the line causing noise or hissing Run the water at the dispenser until the hissing stops to purge the air f
69. duct operation 2 When a failure is detected the buttons are deactivated 3 If a failure code is released the MICOM resets and normal operation continues 4 The failure code is displayed on the display screen All display graphics that are not part of the failure code are turned off 1 GR G277STSA LSC27990TT TEMPERATURE DISPENSER O PROPER OPERATION FAILURE CODE PRODUCT OPERATION STAUS IN FAILURE INDICATION PART NO ITEM FREEZER ROOM NOTCH REFRIGERATOR ROOM NOTCH CONTENTS OF FAILURE COMPRESSOR FREEZING BLDC COOLING BLDC DEFROST STEPPING MOTOR TEMPERATURE DISPLAY TEMPERATURE DISPLAY MOTOR MOTOR HEATER DAMPTER ABNORMAL FREEZER SENSOR ON FOR 15 MINUTES 1 FREEZER SENSOR Er FS SHORT CIRCUIT OFF FOR 15 MINUTES STANDARD RPM O ABNORMAL REFRIGERATOR SENSOR 1 REFRIGERATOR SENSOR 1 OR 10 MINUTES 2 UPPER PART IN THE Er rs STANDARD RPM O FULL OPENING F REFRIGERATOR SHORT CIRCUIT FULL CLOSING FOR 15 MINUTES COMPARTMENT ABNORMAL REFRIGERATOR SENSOR2 R2 REFRIGERATOR SENSOR 2 3 LOWER PART IN THE NORMAL DISPLAY NOTE 2 See page 19 SHORT CIRCUIT O STANDARD RPM O O O REFRIGERATOR COMPARTMENT ABNORMAL 4 DEFROST SENSOR Er dS ABNORMAL SHORT CIRCUIT O STANDARD RPM O NO DEFROST e DEFROST HEATER TEMPERATURE FUSE SHORT T 5 FAILED DEFROSTING CIRCUIT UNPLUGGED STANDARD RPM Er dH CONNECTOR INDICATED O 4HOUR LATER AFTER TROUBLE MOTOR
70. e hinge its reading may differ from other thermometers in the room MICOM FUNCTION 2 1 3 Lock function 1 If desiring to lock the dislay the dispenser and control panel push on 4 button more than 3 seconds Lock icon is appeared at the right of display with lock status 2 The buzzer sound and control panel and dispenser function is not performed even if pressing display button other than lock key in the lock status 3 If desiring to release the lock status and pressing the lock button more than 3 seconds Lock icon is disappeared at the right of display with the lock release status TEMPERATURE DISPENSER You have succeessfully selected CHILD LOCK gt 01 03 Room 11 35am 32 F 2 1 4 Filter condition display function 1 There is a replacement indicator light for the water filter cartridge on the dispenser 2 Water filter needs replacement once six months 3 You will see a reminder pop up window in the LCD screen 2 weeks before 1 week before due date to replace the filter to notify you that the filter needs to be replaced 4 If you want to reset the filter use the Menu gt Refrigerator gt Filter Reset menu al 37 F 01 03 Tue F F 11 51am 12 MICOM FUNCTION 2 2 Dispenser use selection You can select water or ice Select WATER CRUSHED ICE CUBED ICE by pressing the DISPENSER button as you desire Use your cup to pres
71. ed in NO gt It takes up to 1 hour to receive the weather forecast signal i YES NO Do you live in full coverage area gt According to the conditions of base stations there may be non covered area Please refer to the Use amp Care Guide or visit www ambientdevices com cat device coverage html to know your coverage status Even if you live in full coverage are your refrigerator could not receive wireless weather forecast signal at some place in your home Unfortunately LG does not provide you with a service for coverage 86 TROUBLE DIAGNOSIS 4 5 Others Problems Checks and Measures The refrigerator case is hot W Explain the principles of radiator e The radiator pipes are installed in the refrigerator case and partition plate between the refrigerator and the freezer compartment in order to prevent condensation formation Particularly in summer or after installation of refrigerator it may feel hot but it is normal If there is not enough space to dissipate heat it can be hotter due to lack of heat radiation Please install a refrigerator in a well ventilated place and leave the clearance between refrigerator and wall Small holes in a door liner W Explain that the hole is for releasing air during the manufacturing process e These small holes in the plastic of the refrigerator allow the plastic parts to be molded and the foam insul
72. emaker Noise produced by ice dropping and hitting ice bin Noise from motor sounds Hiss Explain the procedure and principles of Icemaker operation e Automatic Icemaker repeats the cycle of water supplying icemaking ice ejection When water is supplied the water supply valve in the machine room makes sounds like Hiss and water flowing also makes sound When water freezes clicking sounds are heard When ice is being ejected sounds like Hiss produced by a motor to rotate an ice tray and ice dropping and hitting ice bin sounds are also heard Noise when supplying water B Explain the principles of water supplied to dispenser When the water supply button in the dispenser is pressed the water supply valve in the compressor compartment opens and let the water flow to the water tank in the lower part of the refrigerator compartment The water is dispensed by this pressure When this happens motor sound and water flowing sound are heard Noise when supplying ice W Explain the principles of ice supply and procedure of crushed icemaking in a dispenser When ice cube button is pressed ice stored in the ice bin is moved by an auger and dispensed If crushed ice button is pressed the ice cube is crushed When this happens ice crushing and hitting ice bin sounds are heard 84 TROUBLE DIAGNOSIS 4 2 Measures for Symptoms on Temperature Problems Checks and Measures Refrigeratio
73. fter disassembly 53 TROUBLE DIAGNOSIS CLAIMS CAUSES AND CHECK POINTS HOW TO CHECK 4 Warm 1 Clogged cooling path refrigerator Adiabatics liquid leak compartment _ Foreign materials Adiabatics dump liquid temperature 5 No automatic operation faulty contacts 6 Condensation and ice formation 2 Food storage Store hot food Store too much at once Door open Packages block air flow 1 Faulty temperature sensor in freezer or refrigerator compartment r Faulty contact Faulty temperature characteristics 2 Refrigeration load is too much Food Too much food Hot food r Frequent opening and closing Cool air leak Poor door close Partly opens 3 Poor insulation 4 Bad radiation 7 High ambient temperature Insufficient space around refrigertor 5 Refrigerant leak 6 Inadequate of refrigerant 7 Weak compressor discharging power Different rating Small capacity 8 Fan does not work 9 Button is set at strong 1 Ice in freeezer compartment External air inflow Bushing installed incorrectly rDooropens Weak door closing power but not closes Stopper malfunction _ Door sag Food hinders door closing r Gap around gasket Contraction distortion loose door twisted corner not fully inserted Food vapor Storing hot food
74. function table for failure display 2 9 Door opening alarm 1 The buzzer sounds when any door is held open for more than one minute 2 After any door has been open for one minute the buzzer sounds three times for 14 second each then it sounds three times for 14 second each every thirty seconds until the door is closed 3 When all open doors have been closed the buzzer stops Doors of freezer refrigerator or Closing Opening Closing Opening Closing home bar I i 3 Times 3 Times 3 Times 3 Times BUZZER lt 4 4 di Less than One minute 30 30 30 one minute seconds seconds seconds 2 10 Ringing of button selection buzzer 1 If pressing the front display button Ding sound rings 15 MICOM FUNCTION 2 11 Ringing of manual operation manual frost defrost buzzer 1 The buzzer sounds briefly when the test button on the main PCB is pressed 2 If you select manual operation the buzzer sounds three times for 7 19 second each then it sounds three times for 2 10 second each every thirty seconds until the door is closed 3 If you select manual defrost the buzzer sounds three times for 7 19 second each then it sounds three times for 2 10 second each every thirty seconds until the door is closed 2 12 Defrost function 1 Defrost is cycled whenever the compressor s runtime reaches 7 7 14 hours 2 In providing initial power or returning power failure defrost st
75. g alarm does not work Defective connecting lead wire from main PCB to door switch Check lead wire associated with door switch Repair lead wire Defective freezer compartment door switch parts Refer to door switch in parts repair guide Replace Freezer compartment door switch Defective water ice dispenser Ice and water are not dispensed Defective connecting lead wire from Main PCB to lever switch Check Lead Wire associated with lever switch with a tester Repair lead wire Check model with dispenser Defective lever switch parts Refer to door switch in parts repair guide Replace lever switch Defective photo coupler IC parts Check voltage change at photo coupler output terminals with lever switch pressed It is OK if voltage change is between OV 5V Replace photo coupler IC or PCB Defective relay associated with ice dispenser geared motor cube and dispenser solenoid Check relay RY4 RY5 RY12 with a tester Replace defective relay Defective parts associated with ice dispenser geared motor cube and dispenser solenoid Check resistance of parts with a tester Replace defective parts Defective relay associated with water dispenser Check relay RY7 with a tester Replace defective relay Defective parts associated with water dispenser Check resistance of parts with a tester Replace defective
76. h dispenser Abnormal Bad connection Lead Wire connecting Check Lead Wire terminals Reconnect Lead display LCD between Main PCB main PCB and display connecting Main PCB and Wire and directly operation and display circuit PCB is cut or connector display PCB with a tester connect defective terminal connection is contact terminal to bad Lead Wire Defective LCD Defective LCD Check if all LCD are on when Replace display Refer to display Main PCB Test switch is PCB circuit in circuit explanation SISONSVIG 318nou8 L SL Problems Symptom Causes Checks Measures Remarks Bad cooling Freezer temperature is high Compressor does not start Compressor Lead Wire is cut Check compressor Lead Wire with a tester Reconnect Lead Wire Defective compressor Measure voltage at PCB CON2 Replace relay RY1 Refer to load driving relay 3 amp 9 after pressing main PCB and RY2 or PCB driving circuit in test switch once It is OK if circuit voltage is normal explanation Defective freezer Defective Freezer Check resistance of freezer Replace freezer Refer to sensor sensor parts sensor with a tester sensor resistance characteristics table of sensor in circuit Refer to tables on pages 39 42 The wrong sensor has been installed Order by model number and part number Confirm the color of sensor in circuits main PCB sensor housing Repair main PCB se
77. he battery compartment cover on the back side and insert the batteries with correct polarity Fi Install two 1 5V batteries of AAA type Don t mix used batteries with new batteries 90 TV RADIO S5 TROUBLESHOOTING 5 1 General No Poor Symptoms Adjustment 1 No Picture 1 No P401 P501 connector 1 Check P1 connector and switched on 2 Poor TV Main PCB 2 Change the TV Main PCB 2 Poor Picture 1 Poor LCD Lamp 1 Change the LCD 2 LCD Connector 2 Check connector and switched on 5 2 TV No Poor Symptoms Adjustment 1 No Sound 1 No P601 P602 connector 1 Check connector and switched on 2 Poor speaker 3 Poor TV Main PCB 2 Change the speaker 3 Change the TV Main PCB 2 Poor Radiant heat 1 Fan turning abrades wire and tape 1 Detach Fan and remove the Fan interference 2 Poor Fan 2 Change the Fan 3 No TV broadcast 1 No TV connection 1 Check connection and switch on Hinge Cover Back TV 4 Button does not 1 No P105 connector 1 Check connector and switch on work 2 Poor switch 2 Change the Button PCB 5 Remote Control 1 No P105 connector 1 Check connector and switched on does not work 2 Poor Remote Control sensor 3 Poor Remote Control 2 Change the Button PCB 3 Change the Remote Control 5 3 FM Radio No Poor Symptoms Adjustment 1 No Sound 1 Poor FM Radio Tuner 1 Charge FM Radio Tuner 91 TV RA
78. heater cord Narrow evaporator interval Sounds from fan Fan guide contact Unbalance fan sounds T Unbalance Surface machining conditions r Fan distortion Misshappen Bur Ice on the fan Air intake opposite to motor bushing assembly Motor shaft Supporter disorted contact sounds Tilted during motor assembly m Resonance Evaporator noise Evaporator pipe contact No damping evaporator Sound from refrigerant Stainless steel pipe shape accumulator Sound from fin evaporator and pipe during expansion and contraction 3 Bowls and bottles make contact on top shelf 4 Refrigerator roof contact 5 Refrigerator side contact 6 Insufficient lubricants on door hinge 56 TROUBLE DIAGNOSIS 9 Faulty internal voltage short Loosened by vibration 3 Bad lamp socket r Disconnection Bad soldering Bad rivet contact Short Water penetration Low water level in tray r Bad elasticity of contact Bad contact corrosion 4 Door switch Defective I Travlel distance Bad connection Bad terminal contact Adiabatics liquid leak 1 Lead wire is damaged m Wire damage when assembling PTC Cover r Outlet burr the bottom plate Pressed by cord heater lead wire evaporator pipe 2 Ex
79. igerator operates the piston and motor in the compressor rotate at 3600 RPM This sound is caused by the vibration of motor and piston when they start and finish their operation This phenomenon can be compared with that of cars When an automobile engine starts it is loud at first but quiets down quickly When the engine stops so does the vibration Vibration sound Check the sound whether it comes from the pipes vibration and friction e Insert bushing or leave a space between pipes to avoid the noise Fix the fan blade if it is hitting on the shroud Fix the drip tray if it is loosened Sound depends on the installation location e Sound becomes louder if the refrigerator is installed on a wooden floor or near a wooden wall Move it to another location f the refrigerator is not leveled properly a small vibration can make a loud sound Please adjust the level of the refrigerator 83 TROUBLE DIAGNOSIS Problems Checks and Measures Sounds of water flowing B Explain the flow of refrigerant When the refrigerator stops the water flowing sound happens This sound happens when the liquid or vapor refrigerant flows from the evaporator to compressor Click sounds Explain the characteristics of moving parts e This noise comes from the MICOM controller s switch on the top of the refrigerator when it is turned on and off Noise of Icemaker operation applicable to model with Ic
80. ight vacuum which makes the door a little harder to open This will diminish over time When the refrigerator compartment door is opened and closed the freezer compartment door moves up and down When the refrigerator compartment door is opened and closed fresh air comes into the freezer compartment and moves up and down the freezer compartment door Door opens too easily There is a magnet in the gasket so it closes securely without a gap It can be held open easily if something is in the way and obstructs the door s closing Door does not close properly If the refrigerator is not properly leveled the doors will not close easily Adjust the level using the leveling screws under the front of the refrigerator 87 TV RADIO 1 SAFETY PRECAUTIONS 1 1 Warning 1 Be sure to make a safety check if circuit is found components that appear to have overheated or are otherwise damaged should be replaced with new components 2 After servicing be sure that the protected equipment is assembled 3 When you don t watch TV use the POWER button turn it off 1 2 Notes 1 When inserting the instrument or circuit board fix the leads to the jack before soldering 2 Insert higher voltage resistors with a 10mm gap above the PWB 3 Don t touch hot chassis leads 88 2 FEATURE 2 1 Auto Program tuning All stations that can be received are stored 2 2 Auto Sleep TV will automatically s
81. ing at various place along its route Install a damper at the point where your touch reduces the noise 4 Avoid pipe interference 5 Replace defective fan and fan motor 6 Adjust fan to be in the center of the fan guide 7 Leave a clearance between interfering parts and seal gaps in the structures 8 Reassemble the parts which make sound 9 Leave a clearance if evaporator pipes and suction pipe touch freezer shroud SISONSVIG 318nou8 L 89 Problems Causes Checks Measures Remarks Vibration sound Clack a Vibration of shelves and foods in the refrigerator Pipes interference and capillary tube touching in the compressor compartment Compressor stopper vibration 4 Moving wheel vibration 5 Other structure and parts vibration 1 1 Remove and replace the shelves in the refrigerator 1 2 Check light food and container on the shelves 2 1 Touch pipes in the compressor compartment with hands 2 2 Check capillary tube touches cover back 3 1 Check compressor stopper vibration 4 1 Check vibration of front and rear moving wheels 5 1 Touch other structures and parts 1 Reassemble the vibrating parts and insert foam or cushion where vibration is severe 2 Leave a clearance where parts interfere with each other 3 Reduce vibration with bushing and restrainer if it is severe especially compressor and pipe 4 Replace compressor stopper
82. ing safety precautions to use the 8 Do not fray damage run over kink bend pull out or refrigerator safely and correctly and to prevent accident or twist the power cord injury when servicing 9 Check for evidence of moisture intrusion in the Be careful of an electric shock Disconnect the power electrical components Replace the parts or mask with cord from wall outlet and wait for more than three insulation tape if moisture intrusion was confirmed minutes before replacing PWB parts Shut off the power whenever replacing and repairing electric components 10 Do not insert fingers or tools into the icemaker The geared motor drive could cause an injury or damage to When connecting the power cord please wait for more tools or the icemaker than five minutes after the power cord was disconnected from the wall outlet 11 Do not suggest that customers repair their refrigerator themselves This work requires special tools and Check if the power cord is pinched between the knowledge Non professionals could cause fire injury refrigerator and the wall If the plug or cord is damaged or damage to the product it could cause a fire or an electric shock 12 Do not store flammable materials such as ether If the wall outlet is overloaded it may cause a fire Use a benzene alcohol chemicals or gas dedicated circuit for the refrigerator 13 Do not put anything on top of the refrigerator Make sure the outlet is properly grounded especial
83. k on will reset the icemaker control Feeler Water Amount Arm Indic ator Light Power Water Amount Switch Selection Button 45 ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 2 IIEMAKER FUNCTIONS 2 1 Start Position 1 After POWER OFF or power outage check the EJECTOR s position with MICOM initialization to restart 2 How to check if it is in place Check HIGH LOW signals from HALL SENSOR in MICOM PIN 3 Control Method to check if it is in place 1 EJECTOR is in place It is an initialized control so the mode can be changed to icemaking control 2 EJECTOR isn t in place A If EJECTOR is back in place within 2 minutes with the motor on it is being initialized If not go to Step B B If EJECTOR is back in place within 18 minutes after the heater turns from ON to OFF it is being initialized If not it is not functioning Repeat Step B with Heater and Motor off 2 2 Icemaking Mode 1 Icemaking refers to the freezing of supplied water in the ice trays Complete freezing is assured by measuring the temperature of the Tray with Icemaking SENSOR 2 Icemaking starts after completion of the water fill operation 3 The Ice Making function is completed when the sensor reaches 19 F 7 C 1 4 hours after starting 4 If the temperature sensor is defective the ice making function will be completed in 4 hours NOTE After Icemaker Power is ON the Icemaker heater will be on for test for 9 sec 2 3
84. ly something containing water like a vase Particularly in a wet or damp area 14 Do not put glass bottles with full of water into the 6 Use standard electrical components freezer The contents will freeze and break the glass bottles 7 Remove dust and foreign materials from the housing and connecting parts 15 When you scrap or discard the refrigerator remove the doors and dispose of it where children are not likely to play in or around it 16 This is a consumer grade product It is not intended for precise storage of medication SPECIFICATIONS 1 Ref No GR G277STSA LSC27990TT ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DIMENSIONS 908 x 896 x 1771 mm DRIER MOLECULAR SIEVE XH 7 WxDxH 3511 16 355 16 6911 16 in CAPILLARY TUBE ID 00 83 NET WEIGHT 145 kg 319 7 Ibs FIRST DEFROST 4 5 Hours COOLING SYSTEM Fan Cooling DEFROST CYCLE 13 15 Hours TEMPERATURE CONTROL Micom Control DEFROSTING DEVICE Heater Sheath DEFROSTING SYSTEM Full Automatic ANTI SWEAT HEATER Heater Defrost Dispenser Duct Door Heater Dispenser Heater 1004 mm 391 2 in INSULATION Cyclo Pentane ANTI FREEZING HEATER Water Tank Heater COMPRESSOR PTC Starting Type Damper Heater EVAPORATOR Fin Tube Type FREEZER LAMP 40W 1 EA CONDENSER Wire Condenser REFRIGERATOR LAMP 40W 4 EA REFRIGERANT R134a 1859 61 2 oz DISPENSER LAMP 15W 1 EA LUBRICATING OIL FREOL 10G 3
85. n is weak Check temperature set in the temperature control knob Refrigerator is generally delivered with the button set at normal use MID But customer can adjust the temperature set depending on their habit and taste If you feel the refrigeration is weak then set the temperature control button at strong position If you adjust the button in the freezer compartment as well the refrigeration is stronger than adjusting refrigerator only The food in the chilled drawer is not frozen but defrosted Bi The chilled drawer does not freeze food Use chilled drawer for storing fresh meat or fish for short periods For storing for a long periods or freezing food use a freezer compartment It is normal that frozen foods thaw above the freezing temperature in the chilled drawer Refrigerator water is not cool Check the water storage location If water is kept in the door rack move it to a refrigerator shelf It will then become cooler Ice cream softens Explain the characteristics of ice cream e The freezing point of ice cream is below 15 C 5 F Therefore ice cream may melt if it is stored in the door rack Store ice cream in a cold place or set the temperature control button of a freezer at strong position Refrigeration is too strong Check the position of temperature control button Check if refrigeration is strong in whole area of the refrigerator or partly near the outlet of the cooling
86. n motor by cutting off power to the fan when it senses a lock up condition part part part Motor OFF 5V 2V or less 2V or less Motor ON 2 3V 12 14V 8 16V 1 GR G277STSA LSC27990TT R38 4 7K P54 53 C FAN PWM PSI 50 C FAN LOCK MICOM 9 P53 52 F FAN PWM 49 F FAN LOCK 30 EXPLANATION FOR MICOM CIRCUIT 1 12 Temperature compensation and temperature compensation circuit 1 Temperature compensation in freezer and refrigerator 1 GR G277STSA LSC27990TT RIG RI7 10K im Temperature compensation at refrigerator 56 P60 M COM r Lis a Temperature compensation at freezer 57 LAINO HE i m K Freezer Refrigerator Resistance value Temperature Resistance value Temperature Remarks RCF1 compensation RCR1 compensation 180 5 C 9 F 180 2 5 C 4 5 F Warmer 56 kQ 4 C 7 2 F 56 kQ 2 0 C 3 6 F 33 3 C 5 4 F 33 kQ 1 5 C 2 7 F 18 2 C 3 6 F 18 kQ 1 0 C 1 8 F 12 1 C 1 8 F 12 0 5 C 0 9 F 10 0 0 F 10 kQ 0 C 0 F Reference temperature 8 2 kQ 1 C 1 8 F 8 2 KQ 0 5 C 0 9 F 5 6 kQ 2 C 3 6 F 5 6 kQ 1 0 C 1 8 F 3 3 KQ 3 C 5 4 F 3 3 KQ 1 5 C 2 7 F 2 4 7 2 F 2
87. nges only the speed of the cooling without affecting the set temperature The temperature can be adjusted even when ICE PLUS has been selected and is in progress The freezer operates at whatever temperature was set at the time ICE PLUS was selected If you select ICE PLUS the compressor and fan will run until it is deselected or the cycle time has elapsed 3 hours compressor and fan run 3 24 hours COLDEST operation If a defrost cycle occurs while an ICE PLUS is already running ICE PLUS runs for its remaining cycle time after the defrost cycle is completed If the defrost cycle takes longer than 30 minutes ICE PLUS will run for only 2 hours at the end of the defrost cycle If you press ICE PLUS during a defrost cycle the ICE PLUS indicator will illuminate but the compressor will not operate until the defrost cycle is complete If you press ICE PLUS within 7 minutes of compressor cut off the compressor will not operate until the 7 minute delay has passed 10 The freezer fan motor runs at high speed during the ICE PLUS cycle 2 6 OptiFresh Function 1 The OptiFresh bin is positioned at the bottom of the refrigerator compartment and has a separate temperature control to allow perfect storage of fruits and vegetables OptiFresh comprises of OptiFresh sensor at the rear of OptiFresh and a damper between OptiFresh and Freezer compartment and a temperature adjusting display at the top of it When powe
88. nsor housing explanation Defective freezer fan motor Fan motor lead wire is cut Check fan motor lead wire with a tester Reconnect lead wire Defective door switch freezer refrigerator home bar Defective fan motor Defective fan motor driving relay Measure the voltage between PCB power blue line and fan motor after pressing test switch of Main PCB If the voltage is normal it is OK Replace door switch freezer refrigerator and home bar Replace fan motor Replace relay RY5 amp RY6 or PCB Refer to load driving circuits in circuit explanation Faulty defrost Refer to faulty defrost items in trouble diagnosis functions Refer to trouble diagnosis function SISONSVIG 318nou8 L EL Problems Symptom Causes Checks Measures Remarks Bad cooling Wrong Defective Step Motor Check Step Motor Check if Step Motor damper Reconnect lead Refrigerator Damper damper motor and motor and reed switch lead wire temperature reed switch and lead wire are cut with a tester wire are cut Check Step Motor damper part Refer to Step Motor damper in parts repair guide Replace Step Motor damper or refrigerator control box Assembly Check Step Motor damper Motor driving relay in PCB Refer to Step Motor damper in parts repair guide Replace relay or PCB Refer to single motor damper driving circuits in circui
89. om the deodorizer Odor from the old deodorizer Check the deodorizer odors Rinse the deodorizer under running water and let it air dry in a sunny place Remove and replace the deodorants Deodorizer is optional on some models SISONSVIG 318nou8 L LL 2 9 MICOM pressed or when both freezer key and power freezer key are pressed at the same time for more than one second Problems Symptom Causes Checks Measures Remarks Bad PCB All display Bad connection Bad connector Visual check on connector Reconnect electric power LCD are off between Main PCB connection from main connection connector and display circuit PCB to display PCB Defective PCB PCB transformer Check resistance of PCB Replace PCB Applicable to transformer winding is cut transformer input and output transformer or PCB model without PCB transformer terminals with a tester dispenser temperature fuse is If resistance is infinity trans burnt out winding is cut Defective PCB electric Defective regulator IC Check voltage at input output Replace regulator Refer to electric circuit parts 7812 7805 terminals circuit in circuit explanation PCB electric terminal Check fuse in PCB electric Replace PCB fuse fuse is burned out terminal with a tester STR Parts are Check if STR No 2 and 3 pins Replace parts Applicable to damaged are cut when power is off model wit
90. on of charging 6 Braze the end of a pinched charging pipe with copper brazer and test for gas leakage at the brazed parts 6 Gas leakage test Test for leaks on the welded or suspicious area with an electronic leakage tester 7 Pipe arrangement in each cycle When replacing components be sure each pipe is replaced in its original position before closing the cover of the mechanical area 3 5 Standard Regulations For Heavy Repair 3 4 5 6 aS pump 1 Observe the safety precautions for gas handling 2 Use JIG or a wet towel in order to prevent electric wires from burning during welding In order to prevent insulation break and accident The inner case will melt and the insulation will burn The copper piping will oxidize Do not allow aluminum and copper pipes to touch In order to prevent corrosion Observe that the inserted length of a capillary tube into a drier should be 12 Drier Molecular Pipe 7 Make sure that the inner diameter is not distorted while cutting a capillary tube 8 Be sure that the suction pipe and the filling tube should not be substituted each other during welding High efficiency 81 TROUBLE DIAGNOSIS 3 6 Brazing Reference Drawings HOT LINE PIPE ASSEMBLY Freezer Copper Brazing Copper Brazing Copper Brazing Silver Brazing Copper Brazing JOINT PIPE WIRE CONDENSER ASSEM
91. once at the test mode 1 status forced defrost mode 1 Compressor OFF 2 Freezing BLDC motor and cooling BLDC motor turn off 3 Defrost heater turns on 4 Stepping motor damper is completely closed baffle is closed 5 OptiFresh stepping motor damper is completely closed Return to the normal mode when the defrost sensor is above 5 C 41 F Normal Status Press test button once at the test mode 2 status Return to the initial status Compressor will operate after delay for 7 minutes TEMPERATURE Q DISPENSER Q J 37 F m 01 03 Tue Room MENU 11 21am 32F lt TEST MODE 1 gt TEMPERATURE DISPENSER gt 37 y 01 03 Tue Room 1 2 F Hi 11 21am 32 lt TEST MODE 2 gt 20 MICOM FUNCTION 2 17 Dispenser Function 1 The dispenser allows serving ice and water without opening the door 2 Pressing the dispenser switch dispenses crushed or cubed ice or water If ice is selected the switch operates the door solenoid also The door will close 5 seconds after the ice is dispensed 3 If the freezer door is opened the dispenser is deactivated 4 If there is no OFF signal 3 minutes after the ice dispenser is activated the auger and door solenoid are turned off The auger will stop immediately but the door will not close for another 5 seconds 5 The dispenser lamp turns on automatically if the crushed cubed water button is pressed or if the
92. ormal then it is OK explanation Defective defrost sensor parts Check the resistance of defrost sensor Replace defrost Refer to sensor with a tester sensor resistance characteristic table of circuit explanation Defective Buzzer Defective connecting lead wire from Check lead wire related to door Repair lead wire buzzer continuously main PCB to door switch switch with a tester rings or door Defective door switch parts Refer to door switch in parts repair Replace door switch opening alarm guide does not work Defective Buzzer does Key input wire is cut or bad connector Check input wire with a tester Reconnect lead Refer to display display button not sound and buttons do not operate terminal contact in main PCB and display PCB connecting lead wire wire and replace or directly connect bad contact terminal to lead wire circuit in circuit explanation Key is continuously depressed due to structural interference Disassemble frame display and confirm visually Adjust or replace interfering structures SISONSVIG ATANOUL 6 Problems Symptom Causes Checks Measures Remarks Defective display button Buzzer does not sound and buttons do not operate Trouble mode indication Check trouble diagnosis function Repair troubles Refer to mode indication in function explanations Door Buzzer Buzzer continuously rings or door openin
93. ower conducts OK No power conducts NG E Check both terminals of OLP If power conducts OK If not NG E Check the resistance of both terminals At normal temperature 6 OK If disconnected co 49 TROUBLE DIAGNOSIS CLAIMS CAUSES AND CHECK POINTS HOW TO CHECK 2 No cooling 2 Refrigeration system is clogged Moisture Residual moisture Air Blowing Not performed clogged in the evaporator Too short Impossible moisture confirmation Low air pressure Leave it in the air During rest time After work Caps are missed Residual moisture Not dried in the compressor Elapsed more than 6 months after drying Caps are missed L No pressure when it is open Reduced cross section by cutting Squeezed Compressor cap is disconnected Foreign material clogging Foreign materials are in the pipe L No electric Insufficient drier i drier Drier temperature poweron capacity Air dry Check on package thermo con stat L Good storage after finishing p Residual moisture Caps are missed During transportation In pipes During work Air blowing Not performed Performed Too short time Low air pressure L Less dry air Moisture penetration Leave it in the air Moisture penetration into the refrigeration oil Short pipe insert MOIO Pipe gaps 9090 Damaged pipes Too much solder
94. p BICSZIOE OPTION 1 2 98 oh 1 1 gie d ERRE RENATE MERE Po 44 ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 1 OPERATION PRINCIPLE 1 1 Operation Principle of Icemaker Power On Start Position e Adjusts EJECTOR to Start Position with power on Icemaking Harvest Mode Waits until water becomes cold after starting the icemaking operation Runs MOTOR to drop ice from the tray into the ICE BIN During harvest mode check if the ice bin is full Performs Ice Making Mode after supplying water by operating the SOLENOID in ICE VALVE Park Position With the detect lever checks if the ICE BIN is full iH e To operate LINE and SERVICE press and hold the Fill Key for 3 seconds The icemaker will run through 3 stages Harvest Fill Icemaking Test Mode wo 9 vv vy vy wy 1 Turning the Icemaker stop switch off O stops the ice making function 2 Setting the Icemaker switch to OFF and then turning it bac
95. parts SISONSVIG ATANOUL TROUBLE DIAGNOSIS 3 Cooling Cycle Heavy Repair 3 1 The Heavy Repair Standards for Refrigerator with R134a Refrigerant into the pipe NO Items Unit Standards Purposes Remarks 1 Pipe and piping Min Pipe within 1 hour To protect The opening time should be reduced to system opening time Comp within Moisture half of the standards during rain and 10 minutes Penetration rainy seasons the penetration of water Drier within into the pipe is dangerous 20 minutes 2 Welding Nitrogen Weld under To protect Refet to repair note in each part Pressure Nitrogen oxide scale R134a refrigerant is more susceptible to atmosphere formation leaks than R12 and requires more care N2 pressure during welding 0 1 0 2 kg cm Do not apply force to pipes before and after welding to protect pipe from cracking 3 Ne sealed parts Confirm Confirm air leaking protect In case of evaporator parts if it doesn t leak sounds when moisture make noise when removing bushing removing bushing penetration cap blow dry air or Ne gas for more than cap 1 min use the parts Sound usable No sound not usable 4 Refrigeration Evacuation Min More than To remove Cycle time 40 minutes moisture Vacuum Torr Below 0 03 ref Note Only applicable to the model degree equipped with reverse flow protect plate Vacuum EA High and low Vaccum efficienc
96. posed terminal r Compressor Compartment terminal Touching other components Freezer compartment terminal Touching evaporator pipe 3 Faulty parts Transformer Coil contacts cover Welded terminal parts contact cover Bad sealing Sheath heater Refrigerator and freezer switches are reversed Compressor Bad coil insulation Plate heater Melting fuse Sealing is broken Moisture penetration Cord heater E Pipe damaged Moisture penetration CLAIMS CAUSES AND CHECK POINTS HOW TO CHECK 8 Faulty lamp 1 Lamp problem Filament blows out freezer and Glass is broken refrigerator 2 Bad lamp assembly Not inserted compartment E Connect conduction and non conduction parts and check with tester Conduction NG Resistance OK 57 TROUBLE DIAGNOSIS Food Storage Seal condition Long term storage Others Odors from cleaners Storage of fragrant foods or items which shroud not be stored in a refrigerator CLAIMS CAUSES AND CHECK POINTS HOW TO CHECK 10 Structure 1 Door foam appearance Sag Hinge loose r Bolt is loosened during and others transportation Not tightly fastened Fastener wom or damaged Weak gasket Gasket sealing surface defective
97. red on the initial NOTCH of OptiFresh display will be on OptiFresh Crisper If only the refrigerator door is opened the OptiFresh LED will be ON The OptiFresh sensor opens and closes the damper based on the temperature 5 The OptiFresh damper will cycle every hour to prevent icing up otiFresh Crisper Activate Press the button to toggle between ON and OFF 14 MICOM FUNCTION 2 7 Control of variable type freezing fan 1 To increase cooling speed and response to load the MICOM will vary the speed of the freezer fan between low and high 2 The MICOM runs the fan at high speed only at power up and for ICE PLUS cycles and runs at low speed for all other settings 3 If you open the freezer door the refrigerator door or the home bar door and the freezer fan was running at high speed it will reduce to low speed If it was running at low speed when a door was opened it will turn off 4 If the MICOM determines the BLDC fan motor is locked up no signal for 115 seconds it will show a failure code on the display and cut power to the fan To power the fan again unplug the refrigerator for a few seconds and plug it in again 2 8 Control of cooling fan motor 1 The cooling fan motor performs ON OFF control by linking with the COMPRESSOR 2 It controls at the single RPM without varying RPM 3 Failure sensing method is same as in fan motor of freezing fan motor refer to failure diagnosis
98. rews 6 Disconnect electrical connector B on the back fan housing Use a screwdriver blade to remove the 2 rails and the fan housing 7 Pull the fan housing out from the top 8 Check the adhesive foam on the upper and lower fan grilles If it is damaged torn or loose replace it Upper Fan Shroud Electrical Connector B TEES Upper Fan Grille Electrical 72 Lower Fan Grille HOW TO DISASSEMBLE AND ASSEMBLE 4 WATER VALVE DISASSEMBLY 4 Separate the Mechanical Cover and Valve Screw METHOD 1 Turn off the power of the refrigerator pull out the plug Open the FREEZER and REFRIGERATOR Door and disassemble the Lower Cover TT Mechanical Cover 2 Lay a dry towel on the floor and get ready to spill water from the water tank Pull out the Clip Then press the collet to separate the tube from the connector and pour out the water until emptied Refer to the label attached on Front L on how to separate the tube 5 FAN AND FAN MOTOR DISASSEMBLY METHOD 1 Using a short screwdriver loosen one SCREW in DRAIN PIPE ASSEMBLY and one connected to the MOTOR COVER Collet Tube Insert Line DRAIN PIPE ASSEBLY MOTOR COVER Clip 2 Pull and separate the FAN ASSEMBLY and MOTOR turning counterclockwise based on the MOTOR SHAFT FAN ASSEMBLY MOTOR 3 Turn off the water Then separate the water line from the valve The assembly is in the
99. rom the system NOTE To purchase replacement water filter cartridges visit your local appliance dealer or part distributor You can also visit our website www lgappliances com or call 1 877 714 7481 LG MDL PART NO MAKER GR G277STSA 5231JA2006A CUNO LSC27990TT HOW TO INSTALL REFRIGERATOR 3 How to Control the Amount of Water Supplied to Icemaker 3 1 Confirm the amount of water supplied to the icemaker 1 Confirm the amount of water supplied to the icemaker ei 1 Press the button Figure 1 to selsct the level of water Optimum level Large Small 2 Icemaker Operation Test Test mode 1 Press the button Figure 1 for more than 3 seconds and It will start the Test mode 2 Test the operation of the operating part of the icemaker 3 If there is no problem with the operation water is supplied through the water tube up to the selected lebel of water 4 The test mode is completed after the water is supplied Note When using the test mode more than twice consecutively water can overflow When the water overflows wipe the ice storage bin Water Amount Indicator Light Check water level Feeler Arm Power Water Amount Switch Selection Button Figure 1 It is acceptable if the adjusted level of water is a bit smaller than optimum level MICOM FUNCTION 1 Monitor Panel 1 1 GR G277STSA LSC27990TT Temperature Adjust But
100. s lightly on the actuator Each graphic is indicated for the selected function You ll hear a CLICK when the ice door closes 5 seconds after ice is dispensed 2 ot s TEMPERATURE i d lt i 2 DISPENSER e 5 zi W gt r 01 03 Tue Room m O 1 21am 32 F REFERENCE Hold your cup in the dispenser for a few seconds after dispensing ice or water to catch the last few drops or pieces of ice Pressing Switch 2 3 ICE PLUS Freezing Select this function to expedite freezing e Turn on off the IcePlus function using the IcePlus button within the Temperature function The IcePlus icon remains at the ON status after animation when selecting Special Refrigeration IcePlus FRZ CE PLUS freezer function automatically turns off after a set time TEMPERATURE 01 03 Room 02510119 u zr 0149 lt ON gt lt OFF gt 2 4 Dispenser Light 5 e The dispenser light function is repeated following below whenever pressing button TEMPERATURE DISPENSER 37 F 01 03 Tue Room ro 11 21am 32 F 12 MICOM FUNCTION 2 5 ICE PLUS freezing 1 oar G I ICE PLUS freezing is a function to increase the cooling speed of the freezer compartment by running both the compressor and the fan simultaneously ICE PLUS is cancelled and the refrigerator returns to its default setting in the event of a power interruption Selecting ICE PLUS cha
101. t explanation Foreign materials in Step Motor damper baffles Check Step Motor damper baffle visually Remove foreign materials lce formation on Step Motor damper baffles Check if Step Motor damper Heater wire is cut with a tester Replace Step Motor damper or refrigerator control Box Assembly Defective refrigerator sensor Defective refrigerator sensor parts Check the resistance of refrigerator sensor with a tester Replace refrigerator sensor Refer to sensor resistance characteristic table in circuit explanation Refrigerator sensor is substituted for other sensor Check the sensor color in the circuit Main PCB sensor housing Repair main PCB sensor housing Defective refrigerator sensor assembly condition Check if refrigerator sensor is not attached at cover sensor but inner case visually Re attach again the refrigerator sensor SISONSVIG 318nou8 L DL Problems Symptom Causes Checks Measures Remarks Bad defrost Defrost is not Defrost lead wire is cut Check if defrost lead wire is cut with a Reconnect Lead working tester Wire Defective defrost driving relay Check the voltage of CON2 1 and 7 Replace relay RY 7 Refer to load with a tester after pressing main and RY 3 or PCB driving conditions PCB test switch twice check in circuit If the voltage is n
102. t the red hose to the high pressure side and the blue hose to the while charging the low pressure side system It is easier and works better Pipe Connection Vacuum Sequence Open valves 1 and and evacuate for 40 minutes Close valve 5 Refrigerant charging Charging sequence 1 Check the amount of refrigerant supplied to each model after completing vacuum degassing 2 Evacuate charging canister with a vacuum pump 3 Measure the amount of refrigerant charged Measure the weight of an evacuated charging canister with an electronic scale Charge refrigerant into a charging canister and measure the weight Calculate the weight of refrigerant charged into the charging canister by subtracting the weight of an evacuated charging canister KEY POINT Indicate the weight of an Be sure to charge the evacuated charging canister refrigerant at around 25 C 77 F Be sure to keep 5g in the winter and 5g in summer Calculation of amount of refrigerant charged the amount of refrigerant charged weight after charging weight before charging weight of an evacuated cylinder 80 TROUBLE DIAGNOSIS ltems Precautions Evaporator 23 Hot Line Compressor Condenser Charging Canister 4 Refrigerant Charging Charge refrigerant while operating a compressor as shown above 5 Pinch the charging pipe with a pinch off plier after completi
103. ted Aged Burnt Stopper Bad Stopper Not fit assembly inner diameter of stopper Tilted Not r Compressor base not connected Bad welding compressor stand fallen Foreign materials in the compressor compartment OLP sound Chattering sound Insulation paper vibration Capacitor noise 7 Pipe contacts each other Narrow interval Pipe sound No vibration damper Damping Bushing Capillary tube unattached dispense recess Duct door is open Foreign material clogging Condensation on the Not fully filled 7 Surface Liquid shortage door surface Cormer Liquid leak 55 TROUBLE DIAGNOSIS CLAIMS CAUSES AND CHECK POINTS HOW TO CHECK 7 Sounds 1 Compressor compartment operating sounds r Transformer sound Bad connection Correct screw connection Drip tray vibration sound Bad assembly Distortion Foreign materials inside Back cover machine sound Bad connection L Partly damaged L Condenser drain sound Not connected Bad pipe caulking 2 Freezer compartment sounds _ Fan motor sound Normal operating sound Vibration sound Old dried or cracked bushing Bad torque for assembling motor bracket contact M Shroud burr contact Damping evaporator contact Residual frost contact T Damaged
104. to replace Refer to main parts SISONSVIG 318nou8 L Y9 Problems Causes Checks Measures Remarks No defrosting Melting fuse blows 1 Lead wire is cut 2 Bad soldering Check melting fuse with tester If 00 OK If lt Q wire is cut Faullty parts parts replacement Check wire color when maeasuring resistance with a tester Ice in the Suction duct 1 Icing by foreign materials in the duct 2 Icing by cool air inflow through the gap of heater plate 3 Icing by the gap of heater plate 1 Check the inner duct with mirror 2 Check by inserting soft copper wire into the duct soft and thin copper not to impair heating wire 1 Turn power off 2 Raise the front side door side support the front side legs and let the ice melt naturally If power is on melt the frost by forced defrosting 3 Reassemble the heater plate Bad cool air inflow and discharge and bad defrosting due to faulty contact and insertion bad connector insertion into housing of heater melting fuse and motor fan Turn on power open or close the door check that motor fan operates If it operates motor fan is OK 2 Disconnect parts in the refrigerator compartment check the connection around the housing visually defrost and confirm heat generation on the heater Do not put hands on the sheath heater 3 Check the parts which have faults described in
105. ton Calendar amp Anniversary Reminder TEMPERATURE DISPENSER 01 03 Tue Baan 11 21am ser MENU Selection Button Dispenser Selection Button Lock Button Door Alarm Button Dispenser Light Button MICOM FUNCTION 1 2 Display Second Function LCD Check Mode Demo Mode TEMPERATURE DISPENSER 01 03 Tue Room 11 21am sec Communication Data Check Mode Door Alarm Buzzer Mute Mode 1 Door Alarm Buzzer Mute Mode Press Qi button to the buzzer on or off 2 Demo Mode Demo mode is available for displaying the refrigerator in a sales setting or similar condition It allows the display dispenser lights and fan to operate without running the compressor To enter the DEMO mode press and hold the TEMPERATURE and q button simultaneously for 5 seconds until the Ding sounds in the lock status To exit the DEMO mode and return to normal operation press and hold the TEMPERATURE and 4 button simultaneously for 5 seconds until the Ding sounds again in the lock status The refrigerator will default to the NORMAL mode DEMO mode OFF if the power fails 2 LCD Check Mode Press TEMPERATURE and Q p button simultaneously for 1 second in the lock status 4 Communication Data Check Mode Press MENU and 4 button simultaneously for 6 seconds in the lock status w 10 MICOM FUNCTION 2 Description of Function 2 1 1 Function of Temperature Selection TEMPERATURE DISPENSER MENU C
106. trong Clean inside of the refrigerator with detergent and remove moisture Dry inside the refrigerator by opening the door for about 3 or 4 hours and then set the temperature control button at strong Frost in the freezer compartment E Explain the basic principles of frost formation The main causes for frosting Door was left open Air penetration through the gasket Too frequent door opening parties etc Hot foods are stored before they are cooled down The temperature of freezer is 19 C 2 2 F if temperature is set at MID If hot air comes into the refrigerator fine frost forms as cold air mixes with hot air If this happens quite often much frost forms inside of the refrigerator If the door is left open in Summer ice may form inside of the refrigerator Frost in ice tray B Explain basic principles of frost formation When ice tray with full of water is put into a freezer compartment the water evaporates If cool air fan operates the moisture attached to the jaw protruded part of ice mold will freeze and form frost If warm water was put into the ice mold the situation will become worse 4 4 Weather Forecast My refrigerator does NOT display weather forecast information NO 1 Did you turn on weather forecaster 9 Please press the button to get weather information ves 2 Has 1 hour elapsed since your refrigerator was plugg
107. ver in arrow direction until it is loosened and take it out in arrow direction Hinge Lever Note e When disconnecting refrigerator door turn hinge lever counterclockwise If the hinge or bracket are bent during assembly use two extra screws Tap Tite M6 Left Hinge attaching screw in the holes of the upper hinge 3 Disconnect upper hinge 1 from the hinge supporter 2 by grasping the front part of upper hinge and lifting up Hinge Assembly U in arrow direction and pull forward in arrow direction Be careful because the door may fall damaging the door the floor or injuring you 4 Lift up the freezer door 1 in arrow direction and disconnect the door from the lower hinge Don t pull the door forward Note Lift up the freezer door until the water supply tube is fully taken out 5 Assembly is the reverse order of disassembly 94 HOW TO DISASSEMBLE AND ASSEMBLE 2 HANDLE 1 Aluminum short handle Model 1 Grasp the handle by both hands and hold it upward 95 3 FAN SHROUD GRILLE 1 Remove the caps and remove the two screws holding the upper fan grille 2 Remove the upper fan grille by pressing in the hooks with a screwdriver blade Be careful to avoid breaking the plastic 3 Disconnect electrical connector A and remove the upper fan grille 4 Hold the upper part of the lower fan grille and pull it forward carefully 5 Loosen two sc
108. witch itself to standby mode approximately ten minutes after TV station stops broadcasting 2 3 Auto Search FM RADIO Press the TV AV RADIO button and then hold CHA or CH button for more than 1 second to search RADIO Channel TV RADIO 3 CONTROLS e gt gt gt oom lt VOL TV AVIRADIO POWER TV AV RADIO VOLUME OK Remote Control Sensor POWER 89 TV RADIO 4 REMOTE CONTROL KEY FUNCTIONS When using the remote control aim it at the remote control sensor on the TV TV AV RADIO POWER Selects TV AV or Radio tv av radio power e MTS MUTE Switches the sound on ore Selects MTS sound Mono Stereo and SAP fer exit menu FCR Use to scroll the Favorite channel list MENU Activates the on screen menu tog gles through the menus and toggles EX through preset radio station OK CHANNEL A V NUMBER VOLUME lt gt PSM SSM SE TN Adjusts the factory preset picture Selects the sound appropriate for the i i according to the room program s character cc flashbk sleep SLEEP Lets you select the amount of time before your TV turns itself off auto matically cc Select a closed caption Off EZ Mute and On FLASHBK Press the FLASHBK button to return to the last channel you were watch ing Installing Batteries m Open t
109. y can be improved by Pressure sides are operating compressor during evacuation evacuated at the same time for models above 2000 Vacuum EA Use R134a To protect The bushing pipes for R12 refrigerant will piping exclusive mixing of be melted when they are used for R134a manifold mineral and refrigerant causes of leak ester oils Pipe EA Use R134a To protect coupler cxclusive R12 Refri gerant mixing Outlet R134a exclusive Socket Plug R134a exclusive 5 Refrigerant weighing EA Use H134a Do not mix Do not weigh the refrigerant at too hot or exclusively with R12 too cold an area 25 C 77 F is adequate Weighing refrigerant Use copper charging canister allowance 50 Socket 2SV Plug 2PV R134a Note Winter 5g Note Do not burn O ring rubber during Summer 59 welding 6 Drier replacement Use R134a exclusively To remove for R134a refrigerator the moisture Replace drier whenever from pipe repairing refrigerator cycle piping 7 Leak check Do not use soapy Detect Check oil leak at refrigerant leak area water for check refrigerant Use electronic leak detector if oil leak is It may be sucked leak area not found The electronic leak detector is very sensitive to halogen gas in the air It also can detect R141b in urethane Please practice therefore many times before use 76 TROUBLE DIAGNOSIS 3 2 Summary Of Heavy Repair Process Contents Tools Trouble diagnosi

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