REFRIGERATOR SERVICE MANUAL
Contents
1. 18 INTRODUCTION OF E LINEAR COMPRESSOR ese aah eee E 18 20 5 eiu ugblicii le 21 22 6 23 Te PCB PICTURE rl 24 26 98 Troubleshooting With Error DISDIAY eene rU PR 27 35 9 Troubleshooting Without Error Display eco gx oen ea Ge oe neces o reo 36 44 TO 45 48 11 TESTING INFORMATION Eo oS a Y 48 56 12 0 5 D D 57 63 13 ICEMAKER OPEARTING AND TROUBLE SHOOTING METHOD 11111 nnn 64 67 14 DESCRIPTION OF FUNCTION amp CIRCUIT OF 68 71 SAFETY PRECAUTIONS Please read the following instructions before servicing your refrigerator Unplug the power before handling any elctrical componets Check the rated current voltage and capacity Take caution not to get water near any electrical components2. 80 CIRCUIT IMPRIME ECRAN CON102 2423 24125 2 2 3 RD BN 4 SB BL BK RD Wi CON103 CIRCUIT IMPRIME 3 wH MODULE LED 2 RD MODULE LED GARDE INTERRUPTEUR ALEVIER EAU COMMUTATEUR DE LEVIER DE GLACONS R SISTANCE CONDENSATEUR CIRCUIT IMPRIME TRANSISTOR PLAQUETTE DE CIRCUIT IMPRIME INFRAROUGE MOTEUR DE LA MACHINE GLACONS COMMUTATEUR MARCHE ARRET DE LA FABRIQUE DE GLACE COMMUTATEUR TEST LA MACHINE A GLACONS RESISTANCE DE DEL INFRAROUGE CAPTEUR DE LA MACHINE A GLACONS ASSEMBLAGE CIRCUIT IMPRIME FABRIQUE DE GLACE KIT FABRIQUE DE GLACE BK BLACK NOIR BL BLUE BLEU BN BROWN MARRON BO BRIGHT ORANGE ORANGE BRILLANT GY GRAY GRIS YL YELLOW JAUNE SB SKY BLUE BLEU BLANC GN GREEN VERT PK PINK ROSE PR PURPLE PURPLE GN YL GREEN YELLOW VERT JAUNE WH WHITE GY RD GRAY RED GRISIROUGE BLIWH BLUE WHITE BLEU BLANC YL BL YELLOW BLUE JAUNE BLEU ROUGE WH BK WHITE BLACK LANC NOIR RD WH RED WHITE ROUGE BLANC GYWH GRAY WHITE GRIS BLANC WH RD WHITE RED BLANC ROUGE BN WH BROWN WHITE MARRON BLANC YL BK YELLOW BLACK JAUNE NOIR PR WH PURPLE WHITE VIOLET BLANC BO BL BRIGHT ORANGE BLUE ORANGE BRILLANT BLEU
3. ee 10 ICE BTEC NIS e S 10 WATER BUTTON JASSMEBLY idle dot 11 IGE GOBRNERADOOHREPEAGEMEDNE 3800 00 1 00 99 11 IGEMAKEBRSBEPEACEMENT ELI 11 12 SUBIP WBE POR WORKING DISPENSER 12 CAP DUCT MOTOR REPLACEMENT 5 D asc an tte 12 HOW TO REMOVE tmo ei Pa rete ettet 13 HOW TOHNSERTA ICE BIN hte ra edo te d 13 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER 14 15 WATER VALVE DISASSEMBLY METHOD 16 FAN AND FAN MOTOR DISASSEMBLY n nnn nnne n nnns annes nnn nns 16 DRAWER H 17 BOTTOM DRAW ER e 17 A gt cc 18 19 5 dtd tib od
4. 14 1 FUNCTION 14 1 1 Function 1 When the appliance is plugged in it is set to 37 F for Refrigerator and O F for freezer You can adjust the Refrigerator and the Freezer control temperature by pressing the ADJUST button 2 When the power is initially applied or restored after a power failure it is set to Control temperature Previously 3 If you do not press any button after turning on the power only CRUSH or CUBE Label that has been selected will be turned on and all other LEDs on the display Panel will be turned off within 60 seconds Power Save Mode 4 f you press a button only CRUSH CUBE label and Lock icon that has been selected will be turned on and all other LEDs on the display Panel will be turned off within 20 seconds Power Save Mode 5 f you do not want to use the Power Save Mode you can change the Mode by pressing the ICE PLUS Button and Freezer TEMP button simultaneously for more than 5 seconds PLUS SAVING sce LIGHT FILTER ssecs CRUSH CUBE CUBE ICE TYPE REFRIGERATOR ICE PLUS SAVING secs LIGHT FILTER ssecs ALARM LOCK sss ICE TYPE REFRIGERATOR ICE ENERGY PLUS SAVING ssecs ALARM LOCK secs 14 1 2 How to Toggle the Display between F amp C 1 The initial setting is F and the display temperature mode can be changed from F to C or C to F by pressing and holding the FRZ TEMP and the REF TEMP keys at the same time for over 5 seconds and hold the LOCK bu
5. 8 5 Defrost Heater Error Er dH Checking flow Result amp SVC Action Check the Door gasket Pat Result Action Check the Defrost control part Go to the 3 Fuse M Change Fuse M Def 34 42 Q Go to the 3 Heater Change Fuse M Der Go to the 3 Def Heater Sensor Replace product Input Test 3 Mode Push the button 3 times SVC Action 27 112 116 V Go to the 5 lt CON3 gt Replace Main PCB Release the test mode Push the button 1 times Normal Explain to customer 112 116 V 8 6 Checking flow Result amp SVC Action Reset the unit and Input Test 1 Mode Push the button 1 time Open the freezer door and Check the air flow Status SVC Action While an error code is displayed the fan is not working Go to 4 Rotate fan using your hand sn If it is stuck change the motor gue Cause of ice or rust inside of motor Check the Fan motor voltage Poit Result SVC Action 1 2 Below 12V Change the PCB 2 3 Change the motor lt CON4 gt 32 8 7 Icing Fan Error Er IF eae Checking flow Result amp SVC Action Reset the unit and Input Test 1 Mode Push the button 1 time Open the refrigerator door and Check the air flow While an error code is displayed the fan is not working Ch
6. Use exact replacement parts Remove any objects from the top prior to tilting the product 2 O gt 1 SPECIFICATIONS 1 1 LMX28988 e 28 cu ft DOOR DESIGN Side Rounded VEGETABLE TRAY Clear Drawer Type DIMENSIONS inches 35 3 4 X 35 3 8 X 69 3 4 WXDXH 28cu ft COMPRESSOR NET WEIGHT pounds TEMPERATURE CONTROL R 134a 145 g DIMENSIONS DemwoHedes smm Deptt Total withDoor Open v n BegutoTopotOme HegutoTopofDorHnpg _ asor apen 90 deg smn Width door open 90 deg handle 44 1 4 in xm E 1 2 LMX25988 e 25 cu ft DOOR DESIGN Side Rounded VEGETABLE TRAY Clear Drawer Type DIMENSIONS inches 32 23 32 X 35 98 X 69 34 WXDXH 25cu ft COMPRESSOR NET WEIGHT pounds COOLING SYSTEM Fan Cooling Spiral Condenser TEMPERATURE CONTROL R 134a 130 g DIMENSIONS i LL L 91 1 5 94 779 5 LU V E ea 9 A i Width door open 90 deg w handle 41 7 32 in 4 2 PARTS IDENTIFICATION ADJUSTABLE REFRIGERATOR SHELVING The refrigerator compartment shelves are adjustable to allow flexibility for storage needs GALLON STORAGE BINS Three interchangeable bins can be arranged to suit
7. 1 Rp F SENSOR 39V 18N3SSV 1 CAPTEUR GLACE L Bk 79 gt ceo e m lt o 79 20 m ceo ce o 20 e 2 lt m 2 801355384400 JNIYANI LINDO 39V 18 39S V PWB ASSEMBLY DISPLAY CON201 CIRCUIT IMPRIME ECRAN NIVIN A18IN3SSV es CON102 CON103 PRA 102 CON103 WHI TEE 1 RT SENSOR RO mw OU SW INTERRUPTEUR ALEVIER EAU DE LEVIER DE GLACONS s WATER LEVE COMMUTATEUR RESISTANCE CONDENSATEUR PLAQUETTE DE CIRCUIT IMPRIME MOTEUR DE LA CIRGHIT MERINE TRANSISTOR MACHINE GLA ONS PWB ASSEMBLY PHOTO MOTEUR PAS PAS 211 GARDE MANGER ON OFF COMMUTATEUR MARCHE ARRET DE LAFABRIQUE DE GLACE ICE MAKER SENSOR PHOTO TR HEATER CAPTEUR DE LA MACHINE GLACONS PWB ASSEMBLY PANTRY DISPLAY COMMUTATEUR TEST LA MACHINE GLACONS IR LED HEATER R SISTANCE DE DEL INFRAROUGE oz Exo eo MODULE LED 99 8176 RENS 4 16 51419 CAPTEUR PWB PCB ASSEMBLY ICE MAKER mE ASSEMBLAGE CIRCUIT IMPRIM FABRIQUE DE GLACE GARDE ICE MAKER KIT
8. 101 gt Result SVC Action OVor5V Change the Display PCB Result SVC Action OVor5V Change the Main PCB Explain to customer 35 9 Troubleshooting Without Error Display 9 1 Cube mode doesn t work Lr Checking flow Result amp SVC Action Check the Black to White Levers w Result SVC Action While pushing the lever S W 112 115 V Go to the 3 Pushing CON2 Check the RED to White While pushing the lever S W Lever si _ SVC Action 12V Go to the 4 Pushing Change PCB mui ii a Point Result SVC Action 31 1 42 1 0 It s normal Replace Geared Motor 9 9 99 1219 12 1 99 1219 It s normal 3 to 4 Replace Dispenser Motor Geared Motor gt Dispenser Motor 1 1 B 1 d T 4 1 1 lt 1 pag F e a j 1 36 9 2 Crush mode doesn t work Checking Result amp SVC Action Check the Sky Blue to White Lever s w Result SVC Action While pushing the lever S W 112 115 V Go to the 3 Pushing CON2 Check the RED to White Red While pushing the lever S W Lever s w Result SVC Action SIF 9 12V Go to the 4 2 it Pushing Poit Resut SVC Action 31 1 42 45 It s normal Replace Geared Motor 9 9 12 1 52 Its normal Replace Dispenser Motor lt Dispenser Motor gt 337
9. 9 3 Water mode doesn t work Checking flow Result amp SVC Action Check the Purple to White liegen cis Result SVC Action While pushing the lever S W 112 115 V Go to the 3 Pushing Result SVCAction While pushing the lever S W euGroclen 112 115 V Go to the 4 Pushing B gt re Not Go to the 4 15 pushing Change PCB CON3 Check the resistance value Point Resut SVCAction 1 2 3 4 360 4202 It snormal It snormal normal BUENOS Heplace 360 960 4200 It s normal Dispenser Maker Pilot Valve Water Valve Machine Room In door 38 9 4 Freezer room LED lamp doesn t work Checking flow Result amp SVC Action If feel sticky Change the door s w Status Result 8 Action oa _ Normal Change door S W Push Infinity Gotothe3 to the 3 SW _ door S W Check the Blue White to White Red Status Result SVC Action ew o 5 Norma 2 Go to the 4 Change the Status Result SvG Action 0 2 0 Explain to customer Closed Change the Door S W 12 VDC Explain to customer Explain to customer customer Other Change the LED Lamp 39 9 5 Refrigerator room lamp doesn t work Checking flow Result amp SVC Action Check the Refrigerator d
10. LG REFRIGERATOR CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL COLOR STAINLESS ST SMOOTH BLACK SB MODEL LMX28988 SUPER WHITE SW LMX25988 CONTENTS 2 dis SPECIFICATIONS EN 3 4 E PARTS IDENTIFICATION nnn 5 3 aiaa iaaa aiana adaa akabakia 6 16 REMOVING AND REPLACING REFRIGERATOR 5 6 DOOR 4 7 DOOR T NIC ger 8 EFANGAND FAN MOTOR EVAPOEBA TOR ae et e e NS 8 DEFROST CONTROL 8 LAME eee 9 EL E 9 MAIN 10 DISPENSER 10
11. RD YL RED YELLOW ROUGE JAUNE BL RD BLUE RED BLEU ROUGE GYIRD GRAY RED GRIS ROUGE 5 2 LMX25988 LG Electronics CIRCUIT DIAGRAM MEZ62816903 EARTH PART DUCT HTR PLUG TYPE AND COMP EARTHPART PI CE DE MISE LA TERRE CONDUIT CHAUFFAGE LE TYPE DE PRISE ET DE MISE LA TERRE DU COMPRESSEUR FUSE ON CIRCUIT DIAGRAM ARE SUBJECT TO ET LES FUSIBLES FIGURANT SUR LE SCH MA DU CIRCUIT SONT SUJETS MODIFICATION SELON LES REGIONS ET LE TYPE DE MODELE CHANGE DIFFERENT LOCALITIES MODEL TYPE AUGER MOTER MOTEUR A VIS SANS FIN 5 GN YL wet GY CORDON MOTEUR DE VENTILATEURR D ALIMENTATION CC SANS BALA NEUTRE ai 1 MOTEUR DE VENTILATEUR F GN YL TENSION FUSIBLE CC SANS BALA POWER CORD NEUTRAL CLAPET GLACONS CAPACITOR PART WH CLAPET EAU We ea BL N LI I 1 LI ROBINET PILOTE BO VL PKL BLN al MOTEUR DE VENTILATEUR CC SANS BALAI DEBITMETRE MOTEUR DE VENTILATEUR CC SANS BALAI PWB ASSEMBLY DISPENSER CON CHAUFFAGE 2 lt DE CHAUFFAGE op FUSIBLE M H31VM R SISTANCE CONDUITE D E LINEAR CAPDUCT MOTEUR DU REFRIGERATOR CONDENSATEUR STEPPING PAS PAS PL R FRIG RATEUR COMPRESSOR EARTH PART CIRCUIT IMPRIME PWB ASSEMBLY D SENSOR R SENSOR F U DOOR S W F L DOOR S W
12. 2 4 Check the 1 3 Check to see if there is electrical current if there is resistance the damper is good Standard 11 8 Lamp Socket Function The lamp socket connect cover lamp assembly to lamp The lamp socket fix lamp and unite lamp and cover lamp assembly The lamp socket supply electric source to lamp also How to Measure Check the resistance between connector of housing and connector of lamp socket It means check whether or not applying an electric current If there is resistance it means the lamp socket is good 96 and 9o 6 58 11 9 Flow Sensor Function Flow Sensor in machine room Count the water quantity from city water to water filter in refrigerator How to Measure Flow Sensor in machine room Standard 59 12 TROUBLESHOOTING 12 1 INFORMATION OF LINEAR COMPRESSOR The information tag provides compressor model refrigerant serial number and safety approval Compressor Label gt 1 Compressor Model EC75LANE Series name 3 DLF FA FB Operating Type A A Inverter E Inverter Displacement 222 e Voltage ex 90 9 0cm stroke amp Frequency x M 220V 50 60Hz Application Category D 115V 50 60Hz L LBP with R134a n H HBP with R134a UU e Efficiency version N LBP with R600a 1 generation B 2 generation Name Plate 2 Refrigerant 3 Serial Number
13. 3 clockwise Lift top hinge 4 free of hinge lever latch 5 4 Lift door from middle hinge pin and remove door CAUTION When lifting hinge free from the latch be careful that the door does not fall forward 5 Place the door with the insides facing up on a not scratch surface Figure 3 Figure 1 WM MER N Y 1 Insert the tube until you can see only one of the lines printed on the tube 2 After inserting pull the tube to ascertain that itis secure 3 Assemble clip Lu Incorrect Correct 3 2 DOOR Door Gasket Replacement e Mullion Removal 1 Insert gasket into channel 1 2 Press gasket into channels on the four remaining Remove 2 screws sides oi door 2 Lift Mullion up carefully e Mullion Replacement 1 Connect wire harness 3 Disconnect wire harness 2 Insert mullion into the channel Insert the cover assembly into bracket door e Door Gasket Removal 1 Remove gasket Pull gasket free from gasket channel on the four 3 Assemble 2 screws remaining sides of door 3 3 Door Alignment If the space between the door are uneven follow the instructions to align them Remove the Base Grillie Turn the leveling legs counter clock wise to raise or clock wise to lower the height of the front of the refrigerator by using flat blade screw driver or 11 32 wrench Use the wrench Included with the User Manual to adjust the bolt in t
14. on on on on off repeating LED six time repetiton circuit FEET overcurrent error ON on on on on off on on on on off repeating LED seven time PCB part EEEREN on on on on on on off on on on on on on on off repeating 49 1 After resetting power check if it is running normal 2 If the same symptom arises after the first action replace PCB 1 After resetting power check if it is running normal 2 lf the same symptom arises after the first action replace PCB 3 If the same symptom arises after the second action replace compressor 1 After resetting power check if it is running normal 2 If the same symptom arises after the first action replace PCB 3 If the same symptom arises after the second action replace compressor 1 After resetting power check if it is running normal If the same symptom arises after the first action replace PCB If the same symptom arises after the second action replace compressor 1 After resetting power check if it is running normal 2 If the same symptom arises after the first action replace PCB 10 4 How to check the Fan Error 1 EBR650027 After sending a signal to the fan the MICOM checks the BLDC fan motor s lock status If there is no feedback signal from the BLDC fan the fan motor
15. 00 00 9 2003 13 0012 Buyer Code 3 No cem R134a Model Code TEE Size 90mm X 20mm i 1 Januar October November Year 9 September D December There two types of controllers used in the linear compressor system The E inverter system is used with the FC75LANE compressor Refrigerator Comp Drive Compressor Comp On Off myerier ou E Inverter Modulation System i Constant Voltage Constant Frequency 60 To reduce noise level the piston stroke is slowly increased to full power during start up Step 1 Start up Half stroke interval for first 30 seconds Step 2 Ramp up Stroke increases every 0 8sec until maximum stroke length is reached about 3 min 15 sec E Inverter Step 3 CVCF interval 180V 60Hz Stroke Power Time Step 1 Start up Half stroke interval for first 20 seconds Step 2 Ramp up Stroke increases until maximum stroke length is reached about 1 min 40 sec Step 3 VVVF interval target voltage and frequency A Inverter controlled by Control Board signals Stroke Power Time There are 6 protection logics designed to protect the linear compressor system When a failure is detected the compressor will shut and will try to restart after a set period of time for each type of failure The LED located on the inverter drive PCB will flash the approp
16. MANGER KIT FABRIQUE DE GLACE ASSEMBLAGE CIRCUIT IMPRIME AFFICHAGE GARDE MANGER BK BLACK NOIR BL BLUE BLEU BN BROWN MARRON BO BRIGHT ORANGE ORANGE BRILLANT GY GRAY GRIS YL BL YELLOW BLUE JAUNE BLEU RD RED ROUGE WH RD WHITE RED BLANC ROUGE BN WH BROWN WHITE MARRON BLANC RD YL RED YELLOW ROUGE JAUNE YL YELLOW JAUNE GN GREEN VERT PR PURPLE PURPLE WH WHITE BLANC GY RD GRAY RED GRIS ROUGE WH BK WHITE BLACK LANC NOIR YL BK YELLOW BLACK JAUNE NOIR PR WH PURPLE WHITE VIOLET BLANC BL RD BLUE RED BLEU ROUGE SB SKY BLUE BLEU BLANC PK PINK ROSE GN YL GREEN YELLOW VERT JAUNE BL WH BLUE WHITE BLEU BLANC RD WH RED WHITE ROUGE BLANC GYWH GRAY WHITE GRIS BLANC BO BL BRIGHT ORANGE BLUE ORANGE BRILLANT BLEU GY RD GRAY RED GRIS ROUGE 6 TROUBLESHOOTING 6 1 Error Code Summary WARNING When checking Resistance values make sure to turn off the power and wait for the voltage to discharge NOTE Within 3 hours after the error Press the Ice Plus button and Freezer button simultaneously 3 hours after the error All errors except for Er rt Er 55 Er IS except for Icing sensor Er gF Er It error are displayed Er IS which is displayed without input of user is the error of Icing Sensor Error Code D Error Code Error Display Error Detection Freezer Refrigerator Category Temperature Temperature Error c
17. between all compressor terminal and ground FC75LANE Capacitor Spec 550V 10uF 5 Po Power Co Common N C No Connecting Compressor Winding Resistance Check 6 8 Between Po and Co LG Linear Compressor NOTE Any Terminal to Ground should read Inf Inf N 6 80 Inf 63 12 2 SERVICE DIAGNOSIS CHART COMPLAINT POINTS TO BE CHECKED REMEDY Plug into the outlet Set the switch to ON Replace the fuse If the voltage is low correct the wiring No Cooling Cools poorly Food in the Refrigerator is frozen Condensation or ice forms inside the unit Condensation Is the power cord unplugged from the outlet Check if the power switch is set to OFF Check if the fuse of the power switch is shorted Measure the voltage of the power outlet Check if the unit is placed too close to the wall Check if the unit is placed too close to the stove gas cooker or in direct sunlight Is the ambient temperature too high or the room door closed Check if food put in the refrigerator is hot Did you open the door of the unit too often or check if the door is sealed properly Check if the Control is set to Warm position Is food placed in the cooling air outlet Check if the control is set to colder position Is the ambient temperature below 41 F 5 C Is liquid food sealed Check if food put in the refrigerator is hot Did you open the door
18. controlled at the lowest temperature After 24 hours or if the Ice PLUS key is pressed again the Ice room will return to its previous temperature During the first hour 1 Compressor Freezer Fan and Icing Fan run continuously 2 If a defrost cycle begins during the first 30 minutes of Ice Plus the Ice PLUS cycle will complete its cycle after defrosting has ended If the defrost cycle begins when Ice Plus has run for more than 30 minutes Ice PLUS will run for 40 minutes after the defrost is completed 3 If Ice PLUS is pressed during defrost Ice Plus Icon is on but this function will start seven minutes after defrost is completed and it shall operate for three hours 4 If Ice Plus is selected within seven minutes after compressor has stopped the compressor compressor delays seven minutes shall start after the balance of the delay time For the rest of the 23 hours the Ice room will be controlled at the lowest temperature 14 1 12 How to set the display mode and cancel it 1 2 3 With the refrigerator door open keep pressing the Refrigerator Temp Button and ICE PLUS Button more than 5 seconds then it goes to the display mode with Special Beep Sound With Special Beep Sound Perform the same way again to cancel the display mode All Freezing unit will be turned off at display mode Exceptions Lamp Display 73 14 1 13 Defrosting removing frost 1 Defrosting starts each time the COMPRESSOR running
19. for routine condenser cleaning in normal Home operating environments If the environment is particularly greasy or dusty or there is significant pet traffic in the home the condenser should be cleaned every 2 to 3 months to ensure maximum efficiency If you need to clean the condenser Remove the mechanical cover e Use a vacuum cleaner with a soft brush to clean the grille the open areas behind the grille and the front surface area of the condenser e Replace the mechanical cover 65 12 3 2 SEALED SYSTEM DIAGNOSIS Not Cooling Complaint All components operating No airflow problems Not frosted up as a defrost problem problem has been isolated to sealed system area Frost None Pattern Partial Equalization Equalization Very Fast Very Slow Very Slow Fast Very Fast Inefficient Partial Complete Compressor Restriction Restriction Condenser Cap Tube Temperature Sound Hotter than Normal Faint Room Temperature None to Weak Air Low Side Loss of Change Leak Compressor Not Pumping Yes Trace of Oil No Undercharge The equalization test is trying to restart a compressor using a start kit after it has been operating 66 13 METHOD AND TROUBLE SHOOTING 13 1 Icemaker s Basic Operating Method Start Position D e Adjusts Ice Tray to Start Position with power on Icemaking Waits until water becomes
20. from the rail system 247 4 ADJUSTMENT 4 1 COMPRESSOR 4 1 1 Role The compressor intakes low temperature and low pressure gas from the evaporator of the refrigerator and compresses this gas to high temperature and high pressure gas It then delivers the gas to the condenser 4 1 2 Note for Usage 1 Be careful not to allow over voltage and over current 2 Do not drop or handle carelessly 3 Keep away from any liquid If liquid such as oil or water enters the Cover PTC Compressor may fail due to breakdown of their insulating capabilities 4 Always use the Parts designed for the compressor and make sure it is properly attached to the compressor Parts may appear physically identical but could have different electrical ratings Replace parts by part number and model number Use only approved substitute parts 4 1 3 Remove the cover PTC 4 Assembly in reverse order of disassembly 4 2 INTRODUCTION OF E LINEAR COMRESSOR e E Linear compressor is run by mechanical part design through automatically varying the cooling power The main parts consist of compressor and Sub PCB which controls the compressor PCB authorizes constant voltage and constant frequency to the compressor and protects it 4 2 1 Control of Compressor Block Diagram PWM Compressor Controller 29181 Inverter Linear Frequ Comp 1 t en
21. stops for 10 seconds and then is powered again for 15 seconds To determine that there is a fan motor malfunction this process is repeated 3 times If the fan motor is determined to be defective the error code will be shown in the display for 30 minutes At this point the process will be repeated until the fan motor operates normally If normal operation is achieved the error display is erased and the MICOM is reset automatically No signal Error Display 155 155 4 Normal drive No signal 205 155 Pause 30min Pause 30min 50 11 COMPONENT TESTING INFORMATION 11 1 Defrost Controller Assembly Function The controller assembly is made up of two different kinds of parts The fuse and the sensor To determine if these parts are defective check for resistance The fuse will cut power to the defrost heater at very high temperatures How to Measure Fuse M How to Measure Sensor Standard Fuse M at all temperature Test Point 1 to 2 0 0 152 51 Set a ohmmeter to the 2 housing pin Measure the 2 pin connected to Fuse M If the ohmmeter indicate below 0 10hm fuse m is a good condition But if infinite the part is bad Set a ohmmeter to The 2housing pin Measure the 2 pin connected to Sensor If the ohmmeter indicate 14 at room temperature Sensor is good When check the ohm at other temperatures Check the sensor manual Sensor at room temperature Test
22. table 1 gt Dr Resa 22 30 C 13 F 25 C 4 F 20 C 15 C 14 F 10 C 23 F 5 C 32 F 0 C The sensor is sensing the temperature For example 23kQ indicates 4 F 27 Checking Result amp SVC Action Check for a loose connection 32 F 0 30 kQ 41 F 5 C 24 kQ 59 15 16 kQ The sensor is sensing the temperature 8 2 Refrigerator Sensor Error Er rS Check the White to White Result Action Change the sensor igi Replace the refrigerator f Oitier Normal Check the Temp and lt CON6 gt resistance Table 2 lt Temperature table 2 gt Result 23 F 5 C 38 10 C 19 5 0 For example 30 0 indicates 32 F 28 SVC Action Short Change the sensor Replace the refrigerator Check the Temp and MET resistance Table 1 lt Temperature table 1 gt Resi 22 F 30 C 13 F 25 C 4 F 20 C 15 C 14 F 10 C 23 F 5 C 32 F 0 C The sensor is sensing the temperature ai For example 23kQ indicates 4 F Display lt 101 gt 29 Resut SVC Action Change the sensor Replace the refrigerator Check the Temp and resistance Table 3 Temperature table 3 gt Cee nn 13 F 25 C 23 F 5 C 10 kQ The sensor is sensing the temperature For example 23kQ indicates 4 F 30
23. DC FAN motor DRIVE IC and TR operating Abnormality of BLDC FAN Motor for Freezer It is caused when feedback signal isn t over 65 seconds Poor BLDC Motor connection during BLDC FAN motor DRIVE IC and TR operating Abnormality of BLDC FAN MOTOR For Refrigerator It is caused when feedback signal isn t over 65 seconds Poor BLDC Motor connection during BLDC FAN motor DRIVE IC and TR operating Abnormality of BLDC FAN Motor for Mechanic Hoom I Poor Communication Communication Error connection Poor TR of between Micom of Main PCB Transmitter and Receiver and Display Micom between display and main board Communication Error O1 28 7 PCB PICTURE 7 1 Main PCB LMX28988 EBR650027 2010 02 EBR641739 2010 02 201 24 LMX25988 EBR650027 2010 06 EBR641739 2010 02 201 25 7 2 Display amp Sub Display EBR65749301 2010 02 CON103 CON102 CON101 Sub PCB EBR60070707 2010 02 26 8 Troubleshooting With Error Display 8 1 Freezer Sensor Error Er FS No Checking flow Result amp SVC Action Check for a loose connection Check the Blue White to Blue White SVC Action Short Change the sensor Open Replace the refrigerator YVE iy Other Normal Check the Temp and resistance Table 1 lt CON6 gt lt Temperature
24. N Use the part number to order part not the position number FREEZER PARTS CAUTION Use the part number to order part not the position number CAUTION Use the part number to order part not the position number REFRIGERATOR PARTS DOOR PARTS LMX28988 CAUTION Use the part number to order part not the position number DISPENSER PARTS CAUTION Use the part number to order part not the position number 116 S 4 Ed VALVE 8 WATER TUBE PARTS CAUTION Use the part number to order part not the position number amp ICE BIN PARTS CAUTION Use the part number to order part not the position number MFL62188107 JUNE 2011 Printed in Korea
25. Point to 0 11 2 Sheath Heater Function Sheath heater is a part for defrost All heating wire is connected to only one line To check if the part is defective check the resistance How to Measure 1 2 Set a ohmmeter connect to The 2 housing pin Measure the 2 pin connected to Sheath Heater If the ohmmeter indicate V V Watt R is good condition ex when watt 350w 115 R 115 115 3850 38 Q But if the ohm meter indicate infinity the Sheath heater is bad Standard Sheath heater at all temperature Test Point 1 to 2 34 420 52 11 3 Door Heater Assembly Function The heater is designed to prevent the door from sweating How to Measure 5 2 7 H 7 Test Point 53 11 4 Door Switch Function The switch senses if the door is open or closed When the door open lamp on When the door open the switch give information to Micom When the door open internal contact operate on and off moving plunger of door switch up and down How to Switch Freezer Switch Refrigerator Measure Button Plunger Beep Beep Check the resistance between connectors 1 2 and 3 4 It means check whether or not applying an electric current If there is resistance the switch is good Standard Multimeter beep Switch F R Push the button Plunger or 02 None Q2 54 11 5 D
26. Strongly suspect items below If the issue remains yet though all the diagnosis for icemaker has been carried out Cap duct bad sealing Defective thermal sensor in the icemaker compartment Not cold icemaker compartment area sealed system 13 3 4 Not Dispensing Clogged In the Ice Bin suspected items Customer haven t used ice dispenser over a week Resolution the ices gets stuck if customer doesn t use ice dispenser In this case empty the ice bin and wait until the new ices are stacked in the ice bin Temperature of icemaker compartment is not cold enough Resolution Check ice fan sealed system cap duct vent and other items related to temperature Cap duct doesn t seal the air properly Resolution Possibly warm air could get into the compartment and make ices get stuck Replace the cap duct with new one In door geared motor doesn t work Resolution Change the in door geared motor and test it The water comes out of fill cup and the water get into the ice bin Resolution The water pressure from shutoff valve is too high Hecommend to use regulator to the customer and close the shutoff valve slightly Clogged Ices In the Chute suspected items Cap duct doesn t seal the air properly Resolution Possibly warm air could get into the compartment and make ices get stuck Replace the cap duct with new one 70 14 DESCRIPTION OF FUNCTION amp CIRCUIT MICOM
27. T CONTROL ASSEMBLY GRILLE ASSEMBLY 1 2 3 6 LAMP 3 6 2 Freezer Compartment Lamp Unplug or disconnect power at the circuit breaker 1 Unplug refrigerator power cord form outlet If necessary remove top shelf or shelves 2 Remove screw with driver 3 Grasp the cover Lamp pull the cover downward 3 6 1 Refrigerator Compartment Lamp 1 Release 2 screws 2 Hold both ends and pull down to remove 3 To remove the lamp case and cover release 2 screws as shown 3 7 MULTI DUCT 1 Romove the upper and lower caps with a flat screwdriver and remove 2 screws Figure 3 2 Disconnect the lead wire on the bottom position 4 Use a flat tool as shown below to remove the lamp cover Figure 3 Cover lamp LED Assembly 3 8 MAIN PWB 1 Loosen 3 screws on the PWB cover 4 Holding the inner side of 5 Remove the the dispenser pull lead wire forward to remove CAUTION When replacing the dispenser cover make sure the lead wire does NOT come off and the water line is not pinched by the dispenser 3 10 DISPLAY 3 Disconnect wire harness and replace the main PWB in Remove the display PCB fixing screw Case PCB Display PCB 3 9 DISPENSER 3 11 ICE BUTTON ASSEMBLY 1 Remove the 1 screw holding t
28. Y ICE MAKER ICE MAKER KIT PWB ASSEMBLY SENSOR a z 762816903 PI CE DE MISE LA TERRE LE DE PRISE ET DE MISE LA TERRE DU COMPRESSEUR Y ET LES FUSIBLES FIGURANT SUR LE SCHEMA DU CIRCUIT SONT SUJETS A MODIFICATION SELON LES REGIONS ET LE TYPE DE MODELE CORDON D ALIMENTATION gt NEUTRE XL GN YL TENSION BL N l FUSIBLE ROBINET PILOTE BL N CRA DEBITMETRE RD TPR gi ONDUIT CHAUFFAGE DEF CHAUFFAGE FUSIBLE M BL N N RD 79 gt 83553840400 JNIYANI LINDIO 39 vn 18 N3SS V 201 PIECE DE MISE ALATERRE DE CHAUFFAGE 18 355 GARDE MANGER MOTEUR PAS PAS GARDE MANGER ASSEMBLAGE CIRCUIT IMPRIME AFFICHAGE GARDE MANGER CAPTEUR CIRCUIT DIAGRAM Oe CC SANS CC SANS BALAI MOTEUR DE VENTILATEUR CC SANS BALAI CC SANS BALAI MOTEUR PAS A PAS REFRIGERATEUR G COMMUTATEUR PORTE D RECAPTEUR MOTEUR DE VENTILATEUR R MOTEUR DE VENTILATEUR F MOTEUR DE VENTILATEUR C MOTEUR DU MOTEUR A VIS SANS FIN 2 Bo lt lt CLAPET A EAU RESISTANCE CONDUITE CONDENSATEUR oy RD 6 MODULE 22
29. al 3 to 4 Open the refrigerator door and Check the air flow 44 10 Reference 10 1 TEST MODE and Removing TPA 1 How to enter the TEST MODE Push the test button on the Main PCB to enter the TEST MODE 1 time Comp Damper All FAN on Everything is displayed 2 times Damper closed 22 22 displayed x 9 times Forced defrost mode 33 33 displayed zd amp J Main PWB 2 How to remove Terminal Position Assurance TPA AC gt DC gt After measure the values you should put in the TPA again 45 10 2 TEMPERATRUE CHART FRZ AND ICING SENSOR 46 10 3 TEMPERATRUE CHART REF AND DEF SENSOR 47 Compressor Troubleshooting Step 1 Open PWB cover Step 2 Check for blinking frequency of LED PWB If compressor is normal it does not blink Refer to the next page to find out what actions to take according to how many times LED blink 48 Actions to take according to Led blinking frequency LED operating condition Service guideline LED two time repetiton PCB part defect piston on on off off on off repeating overrun LED four time repetiton Gl BENE dogging on on on on Off on on off repeating LED five time repetiton FEREN Giri constraint On on on on
30. cy DC link Voltage Vcap Voltage Main Counter elec Micom tromotive force v Calculate counter electromotive force Control Block Diagram of Compressor 4 2 2 Compressor operating pattern Drive half stroke after turning on initial power for seconds Then slowly increase stroke and reach target input Once reaching the target input input naturally changes according to refrigerator load without any special control Comp input Interval 1 Half stroke interval after initial running stay at the initial value for 30 seconds Interval 2 Running interval Increase at every 0 8 till it reaches the target input it takes about 3 45 Interval 3 CVCF interval Run by target voltage and main operating frequency and the input naturally changes according to refrigerator load 18 4 2 3 Compressor protection logic e Since linear Comp conducts linear reciprocating motion we have protection logic for compressor motor and PCB as the below Stroke Trip During the operation if stroke is above the target value decrease the target volt by 3V Current Trip Current trip is set in order to protect compressor mechanical part and drive from the overcurrent that might arise during the operation Check the current for every 416 7us and if the Trip exceeds 1 86Arms more than three times at Comp ON forcibly stop and restart six minutes later Lock Pi
31. e motor Motor Point Result Action 1 2 Below 12V Change the PCB 2 3 Change the motor 9 7 Poor cooling in Freezer compratment Checking flow Result amp SVC Action Check the sensor resistance 1 To 2 Result lt 22 F 30 C 40 kQ lt tal igi Jal 13 F 25 C 30 kQ A F 20 C 23 Q lt CON6 gt 5 F 15 C 17 kQ The sensor is determined by the temperature 14 F 10 C 13 kQ For example 23kQ indicates 4 F 93 F 5 C 10 Reset the unit and Input Test 1 Mode Push the button 1 time Open the freezer door and check the air Status SVC Action flow Not blowing Check the F Fan motor Status SVE Raton coef N Check the Compressor irs And sealed system 43 9 8 Over cooling in Fresh food compartment Checking flow Result amp SVC Action Check the sensor resistance Temperature Result 23 F 5 C 38 kQ sis 32 F 0 30 lt CON6 gt 41 F 5 C 24 kQ The sensor is determined by 50 F 10 19 5 the temperature 59 F 15 C 16 kQ For example 30kQ indicates 32 F Reset the unit and Input Test 1 Mode Push the button 1 time Check the R Fan Not blowing Check the damper Go to the 5 Input Test 2 Mode and check the air flow SVC Action Push the button 1 time Blowing Go to the 5 aii Point Result SVC Action 1 to 2 Other Change damper 270 330 Q It s norm
32. eck the Connector Frozen caused the PCB short Check the Fan motor Frozen Lock ect 4 4 Pr f 4 y T M 2 To prevent ice from shorting the connector a new connector was developed Make sure to order the new one Wire seal Silicon No Part Name Old P No New P No Duct Asm 5209JA 5209JA Connector 1044A 1044A Result SVC Action 1 2 Below 12V Change the PCB 2 3 Change the motor Reset the unit and Input Test 1 Mode Push the button 1 time Check the fan rotation Status SVC Acti ction While an error code is displayed Check motoi the fan is not working Windy Go to the 4 Check the Fan motor and surrounding Rotate fan using your hand EM _ If it is stuck change the motor 1 2 Below 12V Change the 2 3 Change the motor PK X X X A 24 8 9 Communication Error Er CO r0 if Checking Result amp SVC Action Check the Red to White Red LL Result SVC Action CON101 9 Check the Hinge loose connection Change the Main PCB Display 7 Result SVC Action EX E uu gt OVor5V Change the Display CON101 Go to the 4 Display ux y s Result SVC Action A c MP x OVor5V Change the Main PCB 101 Go to the 5 Display lt
33. eration STATE OF THE EVAPORATOR Low flowing sound of Refrigerant is heard and frost forms in inlet only Flowing sound of refrigerant is not heard and frost isn t formed Flowing sound of refrigerant is heard and frost forms in inlet only Flowing sound of refrigerant is not heard and frost isn t formed Flowing sound of refrigerant is not heard and frost melts Low flowing sound of refrigerant is heard and frost forms in inlet only Flowing sound of refrigerant is not heard and there is no frost TEMPERATURE OF THE COMPRESSOR A little higher than ambient temperature Equal to ambient temperature A little higher than ambient temperature Equal to ambient temperature Lower than ambient temperature A little higher than ambient temperature Equal to ambient temperature Refrigerant level is low due to a leak Normal cooling is possible by restoring the normal amount of refrigerant and repairing the leak No discharging of Refrigerant Normal cooling is possible by restoring the normal amount of refrigerant and repairing the leak Normal discharging of the refrigerant The capillary tube is faulty Normal discharging of the Refrigerant Cooling operation restarts when heating the inlet of the capillary tube Low pressure at high side of compressor due to low refrigerant level No pressure in the high pressure part of the compressor There is no need
34. he door hinge to adjust the height CCW to raise or CW to lower the height 3 4 FAN AND FAN MOTOR EVAPORATOR 1 Remove the freezer drawer If your refrigerator has an icemaker remove the icemaker first 2 Remove the plastic guide for slides on left side by unscrewing phillips head screws 3 Remove the grille by removing 4 screws and pulling the grille forward 4 Remove the Fan Motor assembly by loosening 3 screws and disassembling the shroud 5 Pull out the fan and separate the Fan Motor and Bracket EAN MOTOR BRACKET MOTOR Ice Fan Scroll Assembly Replacement 1 Remove the plastic guide on the left side using a phillips screwdriver to remove the screws 2 Pull off the sensor cover 3 Remove the grill cover 4 Gently pull on the grill assembly to remove 5 Disconnect the wiring harness 6 Remove all screws on the scroll assembly 3 5 DEFROST CONTROL ASSEMBLY Defrost Control assembly consists of Defrost Sensor and FUSE M The Defrost Sensor works to defrost automatically It is attached to the metal side of the Evaporator and senses its temperature At 46F 8 C it turns the Defrost Heater off Fuse M is a safety device for preventing over heating of the Heater when defrosting 1 Pull out the grille assembly Figure 1 2 Separate the connector with the Defrost Control assembly and replace the Defrost Control assembly after cutting the Tie Wrap Figure 2 DEFROS
35. he lever 2 Remove the spring from the hook 3 Push and pull on the tab to remove 1 Pull out the drain 2 Use these 2 holes to pull out the bottom Me pe Button Lever 3 If nozzle is interfered with button push and pull out the bottom of button and then pull out the right side 10 3 12 WATER BUTTON ASSMEBLY 3 14 ICEMAKER REPLACEMENT 1 Remove screws 1 Remove 4 screws as shown 2 Grasp the Button assembly and lift Button Lever 2 Grasp the bottom of motor cover assembly and pull 3 13 ICE CORNER DOOR REPLACEMENT slowly 1 Loosen the front screw as shown in the picture 2 Lift up the hinge with one hand 3 Pull out the Ice Corner Door with the other hand 3 Disconnect wire harness from wall of compartment In door motor 11 CAUTION Make sure that the motor housing is tapedto 3 16 CAP DUCT MOTOR REPLACEMENT the mold if not positioned correctly the cover will not fit properly 1 Separate the Housing of the Cap Motor 3 15 SUB PWB FOR WORKING DISPENSER 3 When replacing the motor check the position of the door duct and the link for proper fit 1 Disconnect the wire harness Duct Door Link Cap Duct Motor 2 Remove 1 screw from PWB and replace with new PWB 4 Insert 2 screws 12 3 17 HOW TO REMOVE A ICE BIN 3 18 HOW TO INSERT A ICE BIN 1 Grip the handles as shown 1 Insert the Ice Bin slightly tilting to avoid t
36. ice Mode x For cold air circulation Ice tray will be on a slightly tilt one hour after Full Ice Check D ice making mode begins Atilt ice tray means icemaker s normal operation Ice Tray a slightly If water becomes ices the ice tray Ice detecting sensor check if the ice bin is full Twist the ice tray to drop ice into the ICE BIN Harvest Mode Supply water to the ice tray by operating the solenoid valve VU To force water to supply to the ice tray or check icemaker s condition press and hold the FILL Key for gt about 3seconds In the test mode The icemaker will run through 3 stages step by step Harvest Fill water Ice making To reset the icemaker s operation set the power switch OFF position and back it to ON position Ice Tray Ice detecting sensor Icemaker Unit 13 2 ICE MAKER FUNCTIONS 13 2 1 Icemaking Mode 1 Icemaking Mode begins right after the ice tray fills with water 2 Icemaker waits until water becomes in the ice tray x Ice detecting sensor checks if the ice bin is full every 2min 13 2 2 Harvest Mode At least in 110min since icemaker begun icemaking mode Icemaker starts to twist the ice tray to drop ices into the Ice bin After installation at least 1day is needed to make ices x If the icemaker never drop ices to the ice bin though water becomes ices in the ice tray check the real temperature of compartment not
37. ightly Time How long has customer At least 120min must be passed to make ices after water comes into icemaker waited for icemaker to At least 24 hours must be passed to have ice bin full of ices not in case of make ices installation If the issue haven t resolved yet though you have checked all the items above go to next step 68 13 3 2 Icemaker not making ice not making enough Icemaker Unit amp Ice detecting sensor Diagnosis gt icemaker Unit and Ice detecting sensor Diagnosis The icemaker unit and Ice detecting sensor is programmed to be diagnosed Follow the procedure step by step to check to see if icemaker and Ice detecting sensor is working normally Icemaker Unit Ice detecting sensor 1 STEP Icemaker Unit Diagnosis Press the fill key for about 3sec If the icemaker runs 2 stages of harvest and filling water step by step It means icemaker s mechanism is normal x Caution Be sure that the ice tray is not filled with water before pressing fill key 69 2 STEP Ice detecting sensor Diagnosis 5 Push the refrigerator button amp lock button at the same time If is shown on the display after the procedure above Ice detecting sensor is normal If FULL is shown on the display after the procedure above Ice detecting sensor is abnormal x empty 13 3 3 Icemaker not making ice or not making enough ice Other Suspected Items
38. ispenser DC Motor Function Dispenser DC Motor When customer push the dispenser button Pull duct door and abstract from ice bank How to Measure Dispensor DC Motor Standard Dispenser DC Motor 1 to 2 9 9 12 10 11 6 AC Motor ASSEMBLY Function The motor in the door pushed the ice into the dispenser How to lt In door Motor gt lt In door Motor gt Measure Za t wA is 1 Separate the 7224 ae 1 Separate the hou sing x 0 4 housing Measure the _ 2 Measure the resistance between E resistance between 1 and 2 a 1 and 3 Check the resistance between connectors In door motor 1 2 and In door motor 1 3 It means check whether or not applying an Electric current If there is resistance it means the geared motor or solenoid is not inferiority Standard Geared Motor Cube Solenoid 1 to 2 31 1 42 09 Q 1 to 3 31 1 42 095 56 11 7 Damper Function The damper supplies cold air from the freezer to the chill room using the damper plate The chill room is colder when the damper plate is open When the damper is closed the chill rooms temperature will rise How to Measure Table l Tabiel2 2 2 OIKIEAM CW Rotation Housins No amp Rec j 1 2 4 B C Pe D Yell gr emm e e j 3 We Blue White Check the 1 3 lt extension gt d Check the
39. lus button the ice plus icon will be turned on again 3 plus function automatically turns off after a fixed time passes 4 If you want additional power save you can turn on energy saving some heater off for anti dew 5 To turn on or off the energy saving function press Ice plus Energy saving Button for more than 3 seconds 6 We recommend using energy saving function when you go out for quite a long time and are out of the rainy season ICE PLUS 14 1 6 Dispenser use selection WATER PAD You can select water or ice by separated pad switch ICE PAD When you press ice type button ice type will be changed Crush or Cube e Hold your cup in the dispenser for a few seconds after dispensing ice or water to allow the last pieces of ice drops of water to fall into the cup When after initially establ ishing the water comes out the water tank inside fills and until at the time of quality the hour is caught 14 1 7 CONTROL OF FREEZER FAN MOTOR Freezer fan motor has high and standard speeds 2 High speed is used at power up for Ultra Ice and when refrigerator is overloaded Standard speeds is used for general purposes 3 To improve cooling speed the RPM of the freezer fan motor change from normal speed to high 4 High speed 2700RPM Initial power on or load corresponding operation Ultra Ice Normal speed 2400RPM General working conditions 14 1 8 Cooling Fan Motor 1 The cooling fan i
40. n Step 6 Reinstall the two screws into the guide rails Step 7 Reinstall the lower basket and close the freezer one from each side door 15 3 20 WATER VALVE DISASSEMBLY METHOD 3 21 FAN AND FAN MOTOR DISASSEMBLY METHOD 1 Remove screws for the Drain Pipe Assembly and the 1 connected to the Motor Cover 1 Turn off the water to unit Remove the waterline from the valve MOTOR COVER 4 Figure 63 2 Separate the Fan Assembly and Motor turn counter clockwise to remove from the motor shaft FAN ASSEMBLY MOTOR n Figure 60 3 Separate the housing and remove the valve Figure 64 Assemble in reverse order Taking care to avoid 1 Do not to bend the tube during assembly 2 Press the Water Dispenser button letting water pour out this checks for any leaks in the tube connection this may vary depending on the water pressure about 2 minutes Housing Figure 61 4 Remove the clip and press the collet to separate the tube from the connector Note there maybe some water in the line Collet Tube Insert Line Clip Figure 62 16 3 22 DRAWER To remove the freezer drawer the drawer open to extension Remove the drawer and lce Bin lifting the basket from the rail system 3 23 BOTTOM DRAWER To remove the freezer drawer pull the drawer open to full extension Remove the lower DuraBase basket by lifting the basket
41. nce between pin of the connector as shown picture with a multi tester Standard for normality n order to decide whether compressor operating is normal or not check the output transfer during the refrigerator operation After input the initial power and compressor operates wait for 10 minutes to estimate Compressor operation may be diagnosed as normal if the voltage falls between 145V and 180V Warning 1 Please be cautious of electric shock and short it is estimated after turning on initial power 2 If the voltage is estimated less than 80V it is diagnosed as bad 3 Check problems by LED On amp Off Count Sub PCB If compressor protection logic is running LED Lamp s blinking frequency of sub PCB which takes in charge of control can help estimate the protection logic s symptoms and the cause of its problems Comp Off Time Stroke Trip 1min Current Trip 6 Current Trip gt defects or Cycle clogging maybe the causes After estimating winding resistance estimate compressor operation voltage to check if there is any problem and take actions to repair cycle at replacement of compressor Stroke Trip can occur when the surrounding temperature is high C Fan F Fan and so on are constrained or when cycle problems such as moisture blocking or compressor defect are related Lock Piston Trip Since compressor itself can be a potential cause of a defect estimate the compres
42. ode C Error code Freezer Sensor Error Generation Factors Remark Short or Disconnection Error of Freezer Sensor Refrigerator Short or Disconnection Sensor Error of Refrigerator Sensor Defrosting Short or Disconnection of Defrosting Sensor Short or disconnection of the sensor about Ice maker Sensor Error Check each sensor at it s connector Icing Sensor Error Pantry sensor error Room Temp Sensor Error Ice maker kit defect Icing sensor maker sensor Short or Disconnection of Pantry Sensor Short or Disconnectoin of Room temp sensor Other Electric system error When the ice does not drop such as moter gear even when the I M Test S W operation circuit within kit is pressed Flow Error of flow meter or water Meter Sensor Er gF input or low water pressure or flow meter connection Even though it is passed Temperature Fuse Er dH Defect Error of flow meter or water input or low water pressure 1 hour since then Defrosting Disconnection Heater if Defrosting sensor is not disconnection DRAIN Jam over 46 F 8 C it is caused Poor Relay for Heater O Poor Defrosting It is caused when feedback signal isn t over 65 seconds Poor BLDC Motor connection during BLDC FAN motor DRIVE IC and TR operating Abnormality of BLDC FAN Motor for Ice Making It is caused when feedback signal isn t over 65 seconds Poor BLDC Motor connection during BL
43. of the unit too often or check if the door is sealed properly Check if the ambient temperature and humidity of forms in the Exterior Case the surrounding air are high Is there a gap in the door gasket There is abnormal noise Is the unit positioned in a firm and even place Are any unnecessary objects placed in the back side of the unit Check if the Drip Tray is not firmly fixed Check if the cover of the compressor enclosure in the lower front side is taken out Door does not close well Check if the door gasket is dirty with an item like juice Is the refrigerator level Is there too much food in the refrigerator Ice and foods smell unpleasant Check if the inside of the unit is dirty Are foods with a strong odor unwrapped The unit smells of plastic Not defrosting The system is faulty The operation of the Thermistor is incorrect 64 e Other possible problems Check if frost forms in the freezer Check the refrigeration system Check the Thermistor Place the unit about 4 inches 10 cm from the wall Place the unit away from these heat sources Lower the ambient temperature Put in foods after they have cooled down Don t open the door too often and close it firmly Set the control to Recommended position Place foods in the high temperature section front part Set the control to Recommended position Set the control to Warm position Seal liquid foods
44. oor switch If itis stuck Change the door s w Check the door S W resistance SVC Action Result Go to the 3 no Change door S W Push Go to the 3 SW Change door S W Status Result SvG Action Go to the 4 Normal Change the PCB SVC Action Go to the 5 Change the LED Lamp It s normal 40 9 6 Poor cooling in Fresh food section Checking flow Result amp SVC Action Check the sensor resistance Temperature Result 23 F 5 C 38 32 F 0 30 41 F 5 24 KQ The sensor is determined 50 F 10 19 5 the temperature 59 F 15 16 kQ For example 30kQ indicates 32 F Reset the unit and Input Test 1 Mode Push the button 1 time Open the fresh food door and check the Status SVC Action air flow Check the Fan motor Not blowing Check the damper Go to the 6 Status SVC Action N Id Check the Compressor re And sealed system 41 Checking flow Result amp SVC Action Check the Fan motor Rotate fan using your hand Stuck change the motor Cause of ice or rust inside of motor Damper checking method Inputting TEST Mode Check the damper and PCB CON4 42 Test Damper 1Mode Open Damper is normal 1 2 Not mode working Change the damper Aetion EN Change damper damper 270 270 8309 It s normal Point Resu SVC Action 0 Change th
45. ouching the Icemaker Especially Ice Detecting Sensor 3 19 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER 3 19 1 Follow Steps to Remove Step 2 Remove the lower basket Step 1 Open the freezer door Step 3 Remove the two screws from the guide rails Step 4 Lift the freezer door up to unhook it from the rail one from each side support and remove Pull both rails to full extension Step 5 First Remove the gear from the left side first by releasing the tab behind the gear place a screwdriver between the gear and the tab and pull up on the gear Second Remove the center rail Third Remove the gear from the right side by following the same steps for the left side NOTE THIS TAB MUST BE PUSHED IN TO RELEASE THE GEAR Pull the Tab from the Motor 14 3 19 2 Follow Steps to Reinstall Step 1 Reinstall the right side gear into the clip Cl al al nl n a d Step 2 Insert the rail into the right side gear Gears do not Step 3 Insert the rail into the left side gear and insert the need to be perpendicular to each other gear into the clip Step 4 The rail system will align itself by pushing the rails Step 5 Reinstall the freezer door by inserting the rail tabs all the way into the freezer section into the guide rail Pull the rails back out to full extensio
46. riate code to indicate the detected failure This code will continue to flash until the unit is disconnected from the power source Inverter Error Codes The number of A Inv Compressor current and voltage error current Compressor current and voltage error voltage error 20990 Stroke Trip rave Piston stroke overrun detected Piston is locked 2 min 30 sec 5 Trip A Inv Current Trip Current overload detected 2mim30sc 6 IPM Fault ree High current detected due to IPM failure Inv rror 61 Bridge Diodes converts 115V AC Alternating current to 115V DC Direct current The Voltage Multiplying circuit then increases the 115V DC to 230V DC Then the IPM Intelligent Power Module converts the 230V DC to 230V AC The converted AC power can be regulated to any required voltage and frequency E Inverter FC75LANE A I There are two PCB located behind the PCB cover E One is the main PCB and the other is the driver PCB the linear compressor IPM Voltage Check o ensure proper diagnosis make sure that the unit has been plugged in for at least 10 min To determine if the compressor is receiving the proper voltage check the PCB output voltage during operation e Normal operating voltage will be between 80V and 180V AC Note Higher voltage readings may occur under heavy load conditions 62 Insulation check Check for infinite Ohms
47. s switched ON and OFF in conjunction with the compressor 2 The cooling fan Motor has high and standard speeds When room temper rapture more high then 38 speed is high 3 The Failure sensing method is the same as in the fan motor of the freezing fan motor refer to failure diagnosis function table for failure display 14 1 9 Ice Compartment Fan 1 The Icing Fan is controlled by the the sensor on the top of the ice compartment 2 The Failure sensing method is the same as in the fan motor of the freezer refer to failure diagnosis function table for failure display 14 1 10 Refrigeration room Fan Motor 1 The refrigeration room fan is switched ON and OFF in conjunction with the refrigeration room temperature 2 The Failure sensing method is the same as in the fan motor of the freezing fan motor refer to failure diagnosis function table for failure display 72 14 1 11 PLUS The purpose of this function is to intensify the cooling speed of freezer and to increase the amount of Whenever selection switch is pressed selection release the Icon will turn ON or OFF If there is a power outage and the refrigerator is powered on again Ice PLUS will be canceled To activate this function press the Ice PLUS key and the Icon will turn ON This function will remain activated for 24 hrs The first one hour the compressor Freezer Fan and Icing Fan will be ON The next 23 hours the Ice room will be
48. sor resistance value according to 1 s compressor winding value estimation method and estimate the 2 s compressor operation voltage to decide whether it is defective or not Before replacement of compressor replace PCB and conduct the replacement of compressor during compressor replacement IPM fault Replace sub PCB since there is high chance that it is caused by sub PCB s part defect 20 5 CIRCUIT DIAGRAM 5 1 LMX28988 LG Electronics PART PLUG TYPE AND COMP EARTHPART FUSE ON CIRCUIT DIAGRAM ARE SUBJECT TO CHANGE IN DIFFERENT LOCALITIES AND MODEL TYPE POWER CORD NEUTRAL WHT 2 te er CON1 LVE FUSE BL N PILOT VALVE BL N TN EISINNN N AlaN3ssv LE COMPRESSOR EARTH PART BL 3 CAPACITOR PART ga HOSS3udWOO 18 355 NIYIN PWB ASSEMBLY PANTRY DISPLAY CAPDUCT REFRIGERATOR MOTOR STEPPING MOTOR 101 AUGER MOTER wd sa ev go v PWB ASSEMBLY DISPENSER CON PWB ASSEMBLY DISPLAY CON102 103 RT SENSOR elis anb gN se Pk ek t PHOTO TR HEATER ICE MAKER IR LED HEATER RO WH BL RD YL ww 3 2 1 8 8 7 e s 4 s 2 1 PWB PCB ASSEMBL
49. ston Trip If stroke is under 5mm even if the current is more than 14Arms Take it as piston lock and restart after 2730 of Comp OFF Check the current and stroke for every 416 7us and if the condition fits more than three times at Comp ON the Trip occurs IPM fault Trip It occurs if FO signal received from IPM is LOW For every 416 7us check whether FO signal is LOW The trip occurs if it is found three times during the five periods 83ms 4 2 4 Compressor problems diagnosis When there is a problem or failure with the operation you are kindly recommended to check it as follows 1 Check to normality by measurement of resistance Measure the resistance between poles of the hermetic terminal as shown picture with a multi tester measurement several minutes after power off P Power Line C Common Line Case 1 1 If the measured values lie in the normal resistance range as in the table below 9 Compressor is normal Case 1 2 If the measured values are above several M Q or a infinity Wire is disconnected in the shell Case 1 3 If the measured values are excessively of small number 9 There is short somewhere in the shell m Normal resistance range measured at ambient temperature 23 C FC75LANE 6 8 x According to ambient temperature or operation situation the values could show a little deviation 19 2 Check to normality by measurement of Voltage Measure the resista
50. temperature on display Icemaker needs below O F to drop ices to ice bin 13 2 3 Fill Park Position Once the normal harvest mode has been completed the water solenoid will be activated 13 3 Trouble Shooting Ice amp Water system Issues 13 3 1 Icemaker not making ice or not making enough ice Environmental Diagnosis Icemaker can t make ices itself Basically water temperature and time are needed Water If no Water then no Temperature The compartment where the icemaker is located has to be at least 1 F so that icemaker dumps ices to the bin Time At least 80 minutes must be passed to make one series of ices after water comes into icemaker x Test Mode should not be carried out before checking below Not making ice Water Is saddle valve turned on Check saddle valve Is the icemaker fill tube frozen Check the fill tube heater s electrical resistance Are water valve housings are connected properly Check all the water valve connection Water line kinked or damaged Is water filter too old Is Icemaker s tray filled with water or Ice Temperature Does cold air come out from air vent normally Check if Icing fan is working Check if multi duct is blocked Are the amp F room cold enough Measure the temp and Check gas leakage Is measured temperature below 10 F in the icemaker atthe compartment Does icemaker compartment door close t
51. time Betwee 7 50 hours 2 For initial power on or for restoring power defrosting starts when the compressor running time reaches 4 hours 3 Defrosting stops if the sensor temperature reaches 46 4 F 8 C or more If the sensor doesn t reach 46 4 F 8 C in 1 hours the defrost mode is malfunctioning Refer to the defect diagnosis function 8 1 15 4 Defrosting won t function if its sensor is defective wires are cut or short circuited 14 1 14 Defect Diagnosis Function 1 Automatic diagnosis makes servicing the refrigerator easy 2 When a defect occurs the buttons will not operate but the tones such as ding will sound 3 When the defect CODE removes the sign it returns to normal operation RESET 4 The defect CODE shows on the Refrigerator and Freezer Display ICE PLUS o ove ID 19 d amp Display check function If simultaneously pressing Ultra Ice button and freezing temperature adjustment button for a second display LCD graphics on If releasing the button the LCD graphic displays the previous status You can check the error code Within 3 hour Period from initial error 14 1 15 Auto pantry 1 The temperature control will automatically start upon the selected Auto Pantry temperature control 2 You can adjust the Pantry control with three different temperature ranges by pressing the Temp Selector button 74 15 EXPLODED VIEW 8 REPLACEMENT PARTS LIST CASE PARTS LMX28988 CAUTIO
52. tton for seconds LOCK is activated with Lock Icon on 3 The LOCK button is the only control feature that remains active x In selecting Ex In selecting in the locked state The buzzer sound other control buttons PEL LOCK again and the dispenser are deactivated 4 To release from the locked state press and hold the LOCK button again for 3 seconds 5 f you don t hold the Alarm Lock button more than 3 seconds Alarm function will be changed and alarm for opened door will be on off same as alarm icon indicating 14 1 3 Lock function dispenser and display button lock 1 When the refrigerator is first turned on the buttons are not locked LOCK is deactivated with no light on 2 To lock the display the dispenser and the control panel press 14 1 4 Filter condition display function 1 There is a replacement indicator light for the filter Classification In initial Power On Blinking cartridge on the dispenser SOSTIENE Filler RESET 2 Water filter needs replacement once six months or of using water filter 7 CHANGE 9 Filter Status FILTER 3 When the Water Filter Icon blinks you must exchange Display the filter 4 After replacing the filter press and hold the Light Filter button for more than 3 seconds After then water Filter icon turn off with reset status x71 14 1 5 Plus selection 1 Please select plus function for quick freezing 2 When you press the ice p
53. with wrap Put in foods after they have cooled down Don t open the door too often and close it firmly Wipe moisture with a dry cloth It will disappear in low temperature and humidity Fill up the gap Adjust the Leveling Screw and position the refrigerator in a firm place the objects Fix the Drip Tray firmly in the original position Place the cover in its original position Clean the door gasket Position in a firm place and level the Leveling Screw Make sure food stored in shelves does not prevent the door from closing Clean the inside of the unit Wrap foods that have a strong odor New products smell of plastic but this will go away after 1 2 weeks Check Components of the defrosting circuit Perform sealed system repair Replace the Thermistor 12 3 REFRIGERATION CYCLE v Troubleshooting Chart PARTIAL LEAKAGE COMPLETE LEAKAGE J9V V11l PARTIAL CLOG r G G I 00 lt f MOISTURE CLOG COMP RESSION NO COMP RESSION NOISSSYdNOO JAILLO333Gd 12 3 1 Cleaning STATE OF THE UNIT Freezer compartment and Refrigerator don t cool normally Freezer compartment and Refrigerator don t cool normally Freezer compartment and Refrigerator don t cool normally Freezer compartment and Refrigerator don t cool Cooling operation stops periodically Freezer and Refrigerator don t cool No compressing op
54. your storage needs REMOVABLE ICE STORAGE BIN The ice storage bin can be removed to fill ice buckets coolers or pitchers LED INTERIOR LAMPS Two separate LED arrays light the freezer and refrigerator interiors CAN STORAGE BIN FIXED DOOR BINS Ice Bin Compartment Door 3 DISASSEMBLY 3 1 REMOVING AND REPLACING REFRIGERATOR DOORS e Removing Refrigerator Door CAUTION Before you begin unplug the refrigerator Remove food and bins from doors Left Door FIG 2 1 Disconnect water supply tube by pushing back on the disconnect ring 3 FIG 1 2 Open door Loosen top hinge cover screw 1 Use flat tip screwdriver to pry back hooks on front underside of cover 2 Lift up cover Disconnect door switch wire harness and remove the cover Pull out the tube Disconnect all 3 wiring harnesses 4 Remove the grounding screw 5 Rotate hinge lever 6 counterclockwise Lift top hinge 7 free of hinge lever latch 8 CAUTION When lifting hinge free from the latch be careful that door does not fall forward 7 Lift door from middle hinge pin and remove door 8 Place the door with the insides facing up on a not scratch surface Right Door FIG 3 1 Open the door remove 1 screw on the top of the hinge cover Loosen top hinge cover screw 1 Lift up cover 2 2 Disconnect door switch wire harness and remove the cover 3 Rotate hinge lever
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