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LCD TV SERVICE MANUAL

1. COT ATIF ASH TIHHWV TIANVd COT ATIF ASE 2100412935 OLLSINRHOS JHL HO NAVN TOSIAASV SHL NI SINSNOdINOO TVOLLIJO AHL WOH CASA S LAVd 6 SIAN LVANNVA A INO LVHL TVILNASSA 144245 SI 41 SCAVZVH NOOHS TVLIA ANY FATA NOLLVIOVY X WOW NOLLOALOYd YO LNV LYOdWI 4 Tv ID8dS SHLVYOdYOONI OLLHIAHHOS SIH L HO XUV TORN AQ AHL tora CL9T TZTI GIL TOALNO Gu9OT TT GI AL E Iwasa vas amp nsi DS amp nst 9TZ TT COT HONDAHOI IO LLNIO O m mom m om m m m m m m m m m m m m m m m m m m m m m m m m om m m m m m m m m m m 0DX1 00X1 00XI 09XI 709X1 200XI 100X1 100X1 000XL 000X1OX TX DX L8 X 8D X 4680 XE TAOX IIDXL GOT 9H 7069589 lt LGE Internal Use Only Copyright O 2009 LG Electronics Inc All right reserved Only for training and service purposes JJH 8900499987 ouawanos JO NAVIN TOSINAS RI NI SINSNOdINOD AHL CASA SLAVE 4 STANLVANNVIN LVHL TVILNASSH or zivsooe 14190 avasw 1300 195935 SI AI ONIDIAYAS IVOINLOTI INTIA NOLLVIGVY X WOX
2. i 1 92 22 61 O 10113 oldunu AbT ATI TI OOZA VIAS zoora ATS ATS ISWCISAS Tamod SPE OCOOCM A 4 ASPTIVAS ASTTIVAS ACTA Dim ISWCISAS ovat pr SEE 10011 ASCTIVAS ACER ASTTIVNS ANDAAIN ADTI 9 POG9S89SXVA LGE Internal Use Only Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LG Electronics Inc Jan 2009 P NO MFL60021513 Printed in Korea
3. y rias NT aso TOT GH Pws S68 x 7 AST TIVNS TADINI 0801 V2 14 IST ACE ISNT AEE Wr9 TVIWHS 1 GOT 9H v0695895XVH LGE Internal Use Only Copyright O 2009 LG Electronics Inc All right reserved Only for training and service purposes LE 9199 TD e z069 1 anto o Dr an n aroo 9162 62 9060 i I arab amoo AS I DI 5900499397 1 NI SLNSNOdWWOO TVOLLID AHL 0851 H8 SLAVd 4 SAUNLVANNVIW LVHL IVILNSSSH 133935 SI HI ONIOIAWHS NAHM SCUVZVH 320HS TVOTWLO TI ANY FATA A AONAN TACA na Sui adul 00651 Ist ola cuaa NOLLVIQV3 X WOU NOLLOR LLO3Id 30 INVLYOJIAI SH2 LLVHH IVIOHdS 581 4 WV 3D VIG OL
4. No power LED indicator off Check 24V 12V 5 2V of Power B D Check Output of Pass Fail Check LEDAssy Pass 1001 1003 1007 Check P307 Connector Pass Check LED status On Display Unit Pass Check Panel Link Cable Or Module Pass Check Inverter Connector Or Inverter Pass Check Output of IC802 Pass TROUBLESHOOTING No Raster B Process A PROCESS Check short of Main B D or Change Power B D Check short of IC1001 1003 101007 Change 1002 01003 Change LEDAssy Repeat A PROCESS Check LVDS Cable Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes Fail gt Change Panel Link Cable Fail Or Module Change Inverter Connector Fail Or Inverter gt Change 802 Fail Change Module Fail 14 Re soldering Change defect part of IC1001 1 1003 IC 1007 LGE Internal Use Only Raster on PC Signal Check Input source Cable and Jack Check the Input Output Re soldering or Of J104 Fail Change the defect part Check the Input Output gt Re soldering or Of IC100 Fail Change the defect part Check RGB EDID Data Check the Input
5. Only for training and service purposes unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prevent electrostatic charge buildup or exposure of the assembly 3 Use only a grounded tip soldering iron to solder or unsolder ES devices 4 Use only an anti static type solder removal device Some solder removal devices not classified as anti static can generate electrical charges sufficient to damage ES devices 5 Do not use freon propelled chemicals These can generate electrical charges sufficient to damage ES devices 6 Do not remove a replacement ES device from its protective package until immediately before you are ready to install it Most replacement ES devices are packaged with leads electrically shorted together by conductive foam aluminum foil or comparable conductive material 7 Immediately before removing the protective material from the leads of a replacement ES device touch the protective material to the chassis or circuit assembly into which the device will be installed CAUTION Be sure no power is applied to the chassis or circuit and observe all other safety precautions 8 Minimize bodily motions when handling unpackaged replacement ES devices Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity suffici
6. EMC CE IEC No Item Specification Measurement Remark Screen Size 42 wide Color Display Module Resolution 1366 768 Aspect Ratio 16 9 LCD Module 42 TFT WXGA LCD om Operating Environment Temp 0 40 deg Humidity 0 85 Storage Environment Temp 20 60 deg Humidity 0 85 96 Input Voltage AC100 240V 50 60Hz lt 200 W 42 HD LDC Module Maker LGD HD 983 x 576 x 46 0 227 x 0 681 18 EEFL Unit mm Coating 3H Copyright O 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 5 Chroma amp Brightness Optical 5 1 LCD Module the Color Coordinates check condition 50cm from the surface Full White Pattern Picture mode Vivid No Item Min Typ Max Unit Maker Remark 1 Luminance 400 500 cd m W O PC mode Vlew angle R L U D 178 178 degree LGD Color Coordinates White Wx Typ 0 279 Typ LGD 42 HD Wy 0 03 0 292 0 03 LC420WXE SBA1 RED Xr 0 637 Yr 0 335 Green Xg 0 290 Yg 0 611 Blue Xb 0 145 Yb 0 062 Contrast ratio 800 1 1200 1 5 Luminance Variation 1 3 6 Component Video Input Y PB Pr No Specification Remark Resolution H freq kHz V freq Hz Pixel Cl
7. G North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com LCD TV CHASSIS LP91A MODEL 42LH20R 42LH20R MA CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CONTENTS CONTENTS ui 2 PRODUCT SAFETY aia 3 SPECIFICA HON catan 6 ADJUSTMENT 5 9 TROUBLE SHOOTING rimas 14 BLOCK DIAGRAM cuina 17 EXPLODED VIEW consi 18 SVG SHEET Copyright 2009 LG Electronics Inc All right reserved De LGE Internal Use Only Only for training and service purposes SAFETY PRECAUTIONS IMPORTANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety related characteristics These parts are identified by in the Schematic Diagram and Exploded View lt is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock Fire or other Hazards Do not modify the original design without permission of manufacturer General Guidance An isolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC power line Use a transformer of adequate power rating as this protects the technician
8. U with long nose pliers to insure metal to metal contact then solder each connection Power Output Transistor Device Removal Replacement 1 Heat and remove all solder from around the transistor leads 2 Remove the heat sink mounting screw if so equipped 3 Carefully remove the transistor from the heat sink of the circuit board 4 Insert new transistor in the circuit board 5 Solder each transistor lead and clip off excess lead 6 Replace heat sink Diode Removal Replacement 1 Remove defective diode by clipping its leads as close as possible to diode body 2 Bend the two remaining leads perpendicular y to the circuit board 3 Observing diode polarity wrap each lead of the new diode around the corresponding lead on the circuit board 4 Securely crimp each connection and solder it 5 Inspect on the circuit board copper side the solder joints of the two original leads If they are not shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 1 Clip each fuse or resistor lead at top of the circuit board hollow stake 2 Securely crimp the leads of replacement component around notch at stake top 3 Solder the connections CAUTION Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures Copyright 2009 LG Electronics Inc All right reserved Only for trai
9. using A Y CH key on R C 9 Adjust R G B Gain using lt VOL key R C 10 Adjust three modes all Cool Medium Warm Fix the one of R G B gain and change the others 11 When adjustment is completed Enter COPY ALL 12 Exit adjustment mode using EXIT key on R C LGE Internal Use Only CASE First adjust the coordinate far away from the target value x y 1 X y gt target i Decrease the R 2 x y lt target i First decrease the B gain ii Decrease the one of the others 3 x gt target y lt target i First decrease B so make y a little more than the target ii Adjust x value by decreasing the R 4 x target y gt target i First decrease B so make x a little more than the target ii Adjust x value by decreasing the G 4 Standard color coordinate and temperature when using the CA100 or CA210 equipment Coordinate Mode x y Temp uvA Cool 0 276 0 002 0 283 0 002 11 000K 0 000 Medium 0 285 0 002 0 293 0 002 9 300K 0 000 Warm 0 313 0 002 0 329 0 002 6 500K 0 003 To check the Coordinates of White Balance you have to measure at the below conditions Picture Mode User 1 Dynamic Contrast Off Dynamic Colour Off If you miss the upper condition the coordinates of W B can be lower than the spec Copyright 2009 LG Electronics Inc All right reserved 13 LGE Internal Use Only Only for training and service purposes
10. ANY FATA NOLLVIQV FX WOU NOLLOS IO Id LNV LIOdIAI SAYA LV Ad TV ID8dS SALVYOdYOONI INV39VIG OLLHINHHOS AO HAVIA AHL CITAS aras WT Nossa NaN DS 8084 SK Od ot vas ansa Na NINAS O T NV2 fl 450 TOTAS ACTS 1100 3l ma CIO oos aro s 8800 1 5 ISW WALI 12 2060 54 e AIOOIHIN GOT 9H 70695895 LGE Internal Use Only Copyright O 2009 LG Electronics Inc All right reserved Only for training and service purposes UH 91 71 8007 3190 MEN EF IXY ESC 4 ESIAL ESC gt ESIN Od d 2 ILTAW AS LSIN ASA LSN Qinesjoqd MS ASA MS sisay NIOLLdO 5140517579 91 IDs ad Ivas Odd 2108 odd Odd 1349395 OLLHINHHOS AHL 3O XIV IN TOSINASV HHL NI SINHNOdIAOO TVOLLIAO ASN AG 51 4 S
11. ESTI 3097 3C gi fin aay Ag AOT 9H v0695895XVH LGE Internal Use Only Copyright O 2009 LG Electronics Inc All right reserved Only for training and service purposes SA na 91 71 8007 319 nan avisa Isard 5140517579 91 orn ipte ls L al 35010 PLS Oda ATE 1349395 OLLHINHHOS AHL 40 XIV IN TOSINAS AHL NI SINHSNOdIAOO TVOLLIAO GASN AG 51 4 SAYA LVANNVIA AINO LVHL TVLLNASSA SI dl NAHM SCIVZVH TVODLLOSTH ANY FATA NOLLVIO VW YX WOU NOLLOS IO Id 1 4 SAYA LV Ad TV ID8dS SALVYOdYOONI INV39VIG OLLHINHHOS SIHL 30 HHL SOTO i srola cuaae SW Odd 21415504 se oso p se 2 01 95912
12. NOLLOSLIONd LNVLYOANI STAN LVAA IVIOHdS SALVYOdYOONI WV 31D VIG OLLSINHHOS SIH L HO NAVIA TONA JHL LOO HIS 2 TOVOESTVST 2080 SV TIdOIN _ 140 WANAL OS LN cg Ag 141 A91 40001 41001 41001 602 08 LAsla MANA AS 46027 4 1 00611 AcOcH LAV L T 00SNL AYNODYAW G97 9H vO69S89SXV gt LGE Internal Use Only Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes __ 56 1 eov 91 71 3007 AVISO 140 HLOH dS 101140 9104 98211142 1no TINO CLOdNI ELOdNI CLOdNI ND 20 HLOdNI LLOdNI YLAdNI PINOCPCENT 1110 m AZI Y X 5140517579 91 2100412935 OLLSINRHOS JHL HO NAVN TOSIAASV SHL NI SINSNOdINOO TVOLLIJO AHL ASN H8 SLAVA 81424845 ANO LVHL TVLLNASSA 144245 SI 41 NAHM SCAVZVH TVALI ANY FATA NOLLVIQV X WOW NOLLOALOYd 30d 1 4 SAUALV AA TVIDHAS SHLVYOdYOONI OLLHIAHHOS SIH L HO XUV TOMAR AHL SM 501 OGS 801 yar oL aet qnot ud TOOL d LN 00921
13. Output gt Re soldering or Of IC800 Fail Change the defect part Pass Repeat A amp Process No Raster on HDMI Signal No Raster on COMMPONENT Signal Check Input source Cable And Jack Check Input source Cable And Jack heck the Input Outpu Re soldering or Of JK301 JK302 JK30 Fail Change the defect part Check The Input Outpu Re soldering or Of JK101 i Change the defect part 3 P Pass y Re soldering or nput Outpu Change the defect part Check HDMI EDID Data Re download HDCP Check the Input Output Re soldering or Pass v Of IC800 Fail Change the defect part Check the Input Output Re soldering or Of IC800 Fail Change the defect part Repeat A amp Process y Repeat A amp Process Copyright O 2009 LG Electronics Inc All right reserved 15 LGE Internal Use Only Only for training and service purposes Raster On AV Video S Video Signal Pass Check Input source Cable And Jack Check The Input Output Of JK101 JK201 Fail Check the Input Output Of IC800 Pass Repeat A amp B Process No Sound Check The Input Sourse No Signal On TV RF Signal Check Input source Cable And Jack Re soldering or Change the defe
14. copper to ensure that a hazardous condition will not exist if the jumper wire opens 2 Trace along the copper pattern from both sides of the pattern break and locate the nearest component that is directly connected to the affected copper pattern 3 Connect insulated 20 gauge jumper wire from the lead of the nearest component on one side of the pattern break to the lead of the nearest component on the other side Carefully crimp and solder the connections CAUTION Be sure the insulated jumper wire is dressed so the it does not touch components or sharp edges LGE Internal Use Only SPECIFICATION NOTE Specifications and others are subject to change without notice for improvement 1 Application range This spec sheet is applied to LCD TV used LP91A chassis 2 Specification Each part is tested as below without special appointment 1 Temperature 25 5 C 77 9 F CST 40 5 C 2 Relative Humidity 65 10 3 Power Voltage Standard input voltage 100 240V 50 60 Standard Voltage of each products is marked by models 4 Specification and performance of each parts are followed each drawing and specification by part number in accordance with BOM 5 The receiver must be operated for about 5 minutes prior to the adjustment 4 Electrical specification 4 1 General Specification 3 Test method 1 Performance LGE TV test method followed 2 Demanded other specification Safety CE IEC specification
15. is wrong hdmi edid data could not be downloaded well 1 Press the ADJ key 2 Move to the EDID D L and Press the right direction 3 Press the right direction key at Start 4 After about a few seconds appear OK then compele ID y LSB B C ben Deh Ust Bd 4 3 3 RS 232C command Method 1 Command AE 00 10 Caution Don t connect HDMI and RGB D SUB cable when downloading the EDID If the cables are connected Downloading of edid could be failed LGE Internal Use Only 4 3 4 EDID data 1 Analog RGB 128bytes gt Addr 0000 0010 0020 0030 0040 0050 0060 0070 2 Addr 0000 0010 0020 0030 0040 0050 0060 0070 0080 0090 0030 0080 00 0 DODO 00 0 00 0 Addr 0000 0010 0020 0030 0040 0050 0060 0070 0080 0090 00 0 00 0 ooco 0000 00 0 OOFO Copyright 2009 LG Electronics Inc All right reserved 00 04 Only for training and service purposes 4 4 ADC Calibration 4 4 1 ADC Calibration Component Using External pattern 1 Required Equipments Remote controller for adjustment MSPG 925F MSPG 1025 MSPG 3233 Pattern Generator 2 Process 1 Change the Input to Component1 or 2 mode 2 Input the Component 480i 60Hz 100 Color Bar YPbPr signal into Component1 or 2 MSPG 925F Model 209 Pattern 65 3 Press ADJ key on R C for adjustment 4 Enter Password number Password is 0 0 0 0 5 Select 0 ADC cal
16. 5 HDTV 1080P Copyright O 2009 LG Electronics Inc All right reserved 8 LGE Internal Use Only Only for training and service purposes ADJUSTMENT INSTRUCTION 1 Application Range 2 Download steps 1 Execute ISP the main window Mstar ISP This specification sheet is applied to all of the LCD TV Execute Ool the main AVR ION MERE utility Vx x x will be opened LP91A B C D chassis 2 Click the Connect button and confirm Dialog Box MStar ISP Utility 4 4 3 6 2 Specification Aaa a 1 Because this is not a hot chassis it is not necessary to use an isolation transformer However the use of isolation transformer will help protect test instrument 2 Adjustment must be done in the correct order 3 The adjustment must be performed in the circumstance of M 25 5 of temperature and 65 10 of relative humidity if vistar there is no specific designation 4 The input voltage of the receiver must keep 100 220V 50 60Hz 5 Before adjustment execute Heat Run for 5 minutes at RF no signal Elapsed Time 12C 92 B2 USB 396 MStar ISP Utility V4 4 3 6 MES S Ez 3 mw ume owe Device Load Read Auto B F v Restore HDCP Erase Config Connect Dis Con 3 Adjustment items 3 1 PCB assembly adjustment items 1 Download the MSTAR main software Mist ar IC800 Mstar ISP Utility Semiconductor 1 Using D L Jig 2 Using USB Memory Stick El
17. 9 00 XGA Only FHD Model 9 1920 1080 66 587 59 934 138 50 WUXGA Reduced Blanking Only FHD Model 8 HDMI Input 8 1 PC Spec out but it can be shown the picture at only HDMI DVI IN 1 DVI to HDMI Cable No Resolution H freq kHz V freq Hz Pixel clock MHz Proposed Remark 1 640 x 480 31 469 59 94 25 17 VESA VGA 2 800 x 600 37 879 60 317 40 00 VESA SVGA 3 1024 x 768 48 363 60 004 65 00 VESA XGA 4 1280 x 768 47 776 59 87 79 5 VESA WXGA 5 1360 x 768 47 72 59 799 84 62 VESA WXGA 6 1366 x 768 47 7 60 00 84 62 WXGA 7 1280 x 1024 63 595 60 00 108 875 SXGA 8 1920 x 1080 66 647 59 988 138 625 WUXGA 8 2 DTV Mode No Specification Remark Resolution H freq kHz V freq Hz Pixel Clock MHz 1 720 x 480 15 73 59 94 13 500 SDTV DVD 4801 5251 Spec out 2 720 x 480 15 75 60 00 13 514 SDTV DVD 4801 5251 but display 3 720 x 576 15 625 50 00 13 500 SDTV DVD 5761 6251 50Hz 4 720 x 480 31 47 59 94 27 SDTV 480P 5 720 x 480 31 5 60 00 27 027 SDTV 480P 6 720 x 576 31 25 50 00 27 SDTV 576P 7 1280 x 720 44 96 59 94 74 176 HDTV 720P 8 1280 x 720 45 60 00 74 25 HDTV 720P 9 1280 x 720 37 5 50 00 74 25 HDTV 720P 10 1920 x 1080 28 125 50 00 74 25 HDTV 10801 11 1920 x 1080 33 72 59 94 74 176 HDTV 10801 12 1920 x 1080 33 75 60 00 74 25 HDTV 10801 13 1920 x 1080 56 25 50 00 148 5 HDTV 1080P 14 1920 x 1080 67 432 59 94 148 350 HDTV 1080P 15 1920 x 1080 67 5 60 00 148 5 HDTV 1080P 16 1920 x 1080 27 24 00 74 25 HDTV 1080P 17 1920 x 1080 33 75 30 00 74 2
18. AYA LVANNVIA AINO TVLLNASSA SI dl ONIOIAWHS NAHM SCIVZVH ANY FATA NOLLVIGWY X WOU NOLLOS IO Id LNV LIOdIAI TV ID8dS SALVYOdYOONI IV39VIG OLLHINSHOS 30 TOMAR AHL ISTWL XX ISIWL lt 1 ISGIAL lt ISIINL lt XE ISCINL lt 0 ISCINL 18401 Od DO vas wo inr a rri ELO IMZDOHZLVO COL 3 XM SCN lt XSE CSCINL lt 0 SINL lt lt IXA SONL lt OXY SINL w d AYNOYAW 021 9H vO69S89SXVA LGE Internal Use Only Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes A TASA 91 71 8007 5140517579 91 LOCC IBI LIS8s 41845 divus C6 x 98 ALIAS 11 01 00 00 00 1 00 1 500 000 1 100 100 4 000 1 00 0 TIXI HAIK Lf X DX BOX E GIOXL OX D HOXL XE 080
19. H T 24446 125 2 V1VQ lt vas 19S 4 LGE Internal Use Only 17 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes EXPLODED VIEW IMPORTANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety related characteristics These parts are identified by in the Schematic Diagram and EXPLODED VIEW It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X RADIATION Shock Fire or other Hazards Do not modify the original design without permission of manufacturer Set Stand Copyright 200916 Electronics Inc All right reserved 18 LGE Internal Use Only Only for training and service purposes Cer li 91 71 8007 4 1 9 0 AVLSN OHCILA S TLNANOdWOD TLLOdNI 5140517579 91 134995 OLL3W3HOS 30 JO8NASV 3HL NI SLNANOdWOO IHL 303 aasn 39 S1uvd 03139345 SAYNLVANNVW AINO 1
20. LSIAHHOS SIHL dO NAVIA TOINA JHL 0 wad AS I 9H 7069589 lt LGE Internal Use Only Copyright O 2009 LG Electronics Inc All right reserved Only for training and service purposes 6 6 sos XII 91 71 8007 5140517579 91 ASCTIVAS D Il mos NOTE ASINO 8 0 0A ASCACI Bul DT NC 10 60 107 11 1001 TATAHI 81 0A sort A8 T lt ILTAW PMS xx ISA E 13 23041 8 0 0 ICD AG TOOTSIE AC ISAC ESILTINN AS xx SALVIS TENVd 1349395 NPON 0914650 ITAVNA 240 OLLANAHOS JHL 3O XV IN TOSWASY AHL NI SINHNOdIAOO AHL 08601 AG S LUVd SAYA LVANNVIA NINO TVLLNASSA SI dl NAHM SCIVZVH ANY FATA NOLLVIO VW YX WOU NOLLOS IO Id 1 SAYA LV Ad TV ID8dS SALVYOdYOONI INV39VIG OLLHINHHOS 30 HAVIA AHL 1 gpvco PNININIG OC Eds WC aT EEETINYS
21. TVLLN3SS3 SI 4 ONIOIAY3S N3HM SQHVZVH 90HS 1VOIH10373 ANY 38714 NOILVIQVH X 4 NOILO31OHd HOW LNV LHOdWI SIUNLV33 TVIDIAS S31VHOdHOONI AVEDVIO OLL IN3HOS SIH L 30 TOSWASV 3HL 4 Lad So Tg ANITALAIN 0 ON x ony 1019 anor IOV LNOoIaal LO HIC ANDE wid if IDOY INN NIT ALAW onTOIHM HE 1 NOT INN HLOH 3 MaS 8 ONDIdS OlIAI lt DITOR HdA L MOVd MOVLLNO LNW LLNHNOdINOO 10 9 00 1 He AIOOIHIN AOT 9H 7069589 lt LGE Internal Use Only Copyright O 2009 LG Electronics Inc All right reserved Only for training and service purposes 6 ALI 91 71 8007 nan 12011 ISA AV ACIS OTET SA Od vas 91811 105791841 EIOHIANCOOFZL VO 0770 INDIOS Od 5140517579 91 199295 OLLANAHOS JHL 40 NAVN TOSWASY AHL NI SINHNOdIAOO TVOLLIAO AHL 0351136 51 4 SAYA LVANNVIA AINO LVHL TVLLNASSA SI Al NAHM SCIVZVH TVODLLOSTH
22. adjustment remote control 3 Adjustment method The input methods are same as other chassis Use IN START Key on the Adjust Remocon Refer to Job Expression of each main chassis ass y for Option value White Balance Adjustment Purpose Adjust the color temperature to reduce the deviation of the module color temperature Principle To adjust the white balance without the saturation Fix the one of R G B gain to 192 default data and decrease the others Adjustment mode Three modes Cool Medium Warm Required Equipment 1 Remote controller for adjustment 2 Color Analyzer CA100 or CA 210 or same product LCD TV ch 9 should be used in the calibrated ch by CS 1000 3 Auto W B adjustment instrument only for Auto adjustment Copyright O 2009 LG Electronics Inc All right reserved Only for training and service purposes 12 5 2 Adjustment of White Balance For automatic adjustment COLOR ANALYZER 9 Internal Pattern of Mstar C RGB 12 serial communication P LP91A D Support RS 232C 8 2 DDC Communication White Balance Mode 1 Enter the adjustment mode of DDC Set command delay time 50ms Enter the DDC adjustment mode at the same time heat run mode when pushing the power on by power only key Maintain the DDC adjustment mode with same condition of Heat run gt Maintain after AC off on in status of Hea
23. apsed Time I2C 82 B2 USB 3sekHz 2 Input Tool Option Area option EAR AZ ES 3 Download the EDID 1 0 EDID datas are automatically download when adjusting the Tool Option2 4 ADC Calibration RGB Component ick the Config button an ange spee pee 4 Check SW Version 3 Click the Config butt d Ch d 2 Speed setting 350Khz 400Khz 3 2 SET assembly adjustment items MStar ISP Utility 4 4 3 6 1 Input Area option gt 2 Adjustment of White Balance Auto amp Manual Device Load Read Auto B P V Restore HDCP Gpnnect Dis Con 3 Input Tool Option Area option Eoi patas p NN 4 Intelligent Sensor Inspection Guide 220 E ie Td p Cem saon 5 Preset CH information PIN prno 6 Factoring Option Data input po V Reverse High USE SPI E a la ISP Slave Address 0x92 y Serial Debug Slave Address 0582 y 4 PCB assembly adjustment method SE 4 1 Mstar Main S W program download i 4 1 1 Using D L Jig 1 Preliminary steps 4 Read and write bin file 1 Connect the download jig to D sub RGB jack Click 1 Read tab and then load download LH20 LH30 file XXXX bin by clicking Read MStar ISP Utility V4 4 3 6 SW ISP H6_Mstar LH70_FRC 20080925_dvb bin Filexxx bin Checksum Unused Bytes Batch File bini 05 ESP Elapsed Time 2 92 B2 USB 386KHz Copyright 2009 LG E
24. ct part Check The Input Output Of TU500 Re soldering or Check the Input Output Of IC800 Pass Repeat A amp Process Pass Check The Input Output Change The Source Input Of IC600 Pass Re soldering or Change the defect part Check The Speaker seal Check The Speaker Wire Fail Change the defect part Fail Fail Fail Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes Change Speaker 16 Fail Fail Re soldering or Change the defect part Re soldering or Change the defect part LGE Internal Use Only BLOCK DIAGRAM SuJAWOOS H 3dIs 1 3915 Ino dS 100L d 1N AMA IWOH aS Q LO 181610 AS 5154 lt lt vas 19s ans NL 6 NIVA NL 1NOY 1 LNW XH XL H3 1VOS NIVIN SWIAWOOSINOY LNOT LNW SWIAWOOS LLAV 1NOA LNW 1NO LNW NIA LAV ddAL NIA LAV gt NIH NIT ANLE SWIAWOOS H 1 amp 9 22221114 441270711 747947 ZANOD ddAZ 0 L4 gt O1992 NOydA33 e ddAZ 0 L 1d dd A LANOD SA SH 8 9 H Od a 5 125 ei amp giN8 1 jeues
25. en the following servicing precautions and any of the safety precautions on page 3 of this publication always follow the safety precautions Remember Safety First General Servicing Precautions 1 Always unplug the receiver AC power cord from the AC power source before a Removing or reinstalling any component circuit board module or any other receiver assembly b Disconnecting or reconnecting any receiver electrical plug or other electrical connection c Connecting a test substitute in parallel with an electrolytic capacitor in the receiver CAUTION A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard 2 Test high voltage only by measuring it with an appropriate high voltage meter or other voltage measuring device DVM FETVOM etc equipped with a suitable high voltage probe Do not test high voltage by drawing an arc 3 Do not spray chemicals on or near this receiver or any of its assemblies 4 Unless specified otherwise in this service manual clean electrical contacts only by applying the following mixture to the contacts with a pipe cleaner cotton tipped stick or comparable non abrasive applicator 10 by volume Acetone and 90 by volume isopropyl alcohol 90 99 strength CAUTION This is a flammable mixture Unless specified otherwise in this service manual lubrication of contacts in not required 5 Do not defeat any plug socket B voltage in
26. ent to damage an ES device General Soldering Guidelines 1 Use a grounded tip low wattage soldering iron and appropriate tip size and shape that will maintain tip temperature within the range or 500 F to 600 F 2 Use an appropriate gauge of RMA resin core solder composed of 60 parts tin 40 parts lead 3 Keep the soldering iron tip clean and well tinned 4 Thoroughly clean the surfaces to be soldered Use a mall wire bristle 0 5 inch or 1 25cm brush with a metal handle Do not use freon propelled spray on cleaners 5 Use the following unsoldering technique a Allow the soldering iron tip to reach normal temperature 500 F to 600 F b Heat the component lead until the solder melts c Quickly draw the melted solder with an anti static suction type solder removal device or with solder braid CAUTION Work quickly to avoid overheating the circuit board printed foil 6 Use the following soldering technique a Allow the soldering iron tip to reach a normal temperature 500 F to 600 F b First hold the soldering iron tip and solder the strand against the component lead until the solder melts c Quickly move the soldering iron tip to the junction of the component lead and the printed circuit foil and hold it there only until the solder flows onto and around both the component lead and the foil CAUTION Work quickly to avoid overheating the circuit board printed foil d Closely inspect the solder area and remo
27. from accidents resulting in personal injury from electrical shocks It will also protect the receiver and it s components from being damaged by accidental shorts of the circuitry that may be inadvertently introduced during the service operation If any fuse or Fusible Resistor in this TV receiver is blown replace it with the specified When replacing a high wattage resistor Oxide Metal Film Resistor over 1W keep the resistor 10mm away from PCB Keep wires away from high voltage or high temperature parts Before returning the receiver to the customer always perform an AC leakage current check on the exposed metallic parts of the cabinet such as antennas terminals etc to be sure the set is safe to operate without damage of electrical shock Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed metallic parts such as antenna terminals phone jacks etc If the exposed metallic part has a return path to the chassis the measured resistance should be between 1MQ and 5 2MQ When the exposed metal has no return path to the chassis the reading must be infinite An other abnormality exists that must be corrected before the receiver is returned to the customer Copyr
28. ibration Component by using A V CH and press ENTER i 6 ADC adjustment is executed automatically 7 When ADC adjustment is finished this OSD appear 4 4 2 ADC Calibration RGB Using External pattern 1 Required Equipments Remote controller for adjustment MSPG 925F MSPG 1025 MSPG 3233 Pattern Generator 2 Process 1 Change the Input to RGB mode 2 Input the PC 1024x768 60Hz Horizontal Color Bar signal into RGB MSPG 925F Model 60 Pattern 65 3 Press ADJ key on R C for adjustment 4 Enter Password number Password is 0 0 O 0 5 Select 0 ADC calibration RGB by using A CH and press 6 ADC adjustment is executed automatically 7 When ADC adjustment is finished this OSD appear 211 LGE Internal Use Only 4 5 Check SW Version 1 Method 1 Push In star key on Adjust remote controller 2 SW Version check Check SW VER V3 xx LH70 LP91A S W Ver 3 XX UTT 97 LPL L42FHD 00 HDCP 0 SHOP Mode auto home ADC CAL RGB Component SD OK Component SD OK Tool Option1 Tool Option2 Area Option OPTION1 OPTION2 OPTIONS OPTION4 System Control Audio Prescale Threshold Power Off History Panel Control Davinci Auto Test 5 PCB assembly adjustment method 5 1 Input Area Option 1 Profile Must be changed the Area option value because being different of each Country s Language and signal Condition 2 Equipment
29. ight 2009 LG Electronics Inc All right reserved Only for training and service purposes Leakage Current Hot Check See below Figure Plug the AC cord directly into the AC outlet Do not use a line Isolation Transformer during this check Connect 1 5K 10watt resistor in parallel with a 0 15uF capacitor between a known good earth ground Water Pipe Conduit etc and the exposed metallic parts Measure the AC voltage across the resistor using AC voltmeter with 1000 ohms volt or more sensitivity Reverse plug the AC cord into the AC outlet and repeat AC voltage measurements for each exposed metallic part Any voltage measured must not exceed 0 75 volt RMS which is corresponds to 0 5mA In case any measurement is out of the limits specified there is possibility of shock hazard and the set must be checked and repaired before it is returned to the customer Leakage Current Hot Check circuit AC Volt meter Good Earth Ground such as WATER PIPE CONDUIT etc 0 15uF exposed METALLIC PARTS a ud 1 5 Kohm 10W To Instrument s When 25A is impressed between Earth and 2nd Ground for 1 second Resistance must be less than 0 1 Q Base on Adjustment standard LGE Internal Use Only SERVICING PRECAUTIONS CAUTION Before servicing receivers covered by this service manual and its supplements and addenda read and follow the SAFETY PRECAUTIONS on page 3 of this publication NOTE If unforeseen circumstances create conflict betwe
30. lectronics Inc All right reserved 9 LGE Internal Use Only Only for training and service purposes 5 Click 2 Auto tab and set as below 6 Click 3 Run 7 After downloading you can see the 4 Pass message MStar ISP Utility V4 4 3 6 92 ws j mw Device Load Read 5 Restore HDCP Config Connect Dis Con Sre D SWVISP HE_Mstar LH70_FRC 20080925_dvb bin 2008 09 25 556 24 ReConnect Blank Blank Message Blanking 5 Restore Data Multi Flashes 9 Erase Device 6 Al Chip File Area Erase Area Fest 57 Partial Erase Elapsed Time 10 36 12 92 B2 Program Message Programming Program OK Venty Message Verifying Verity End time 22 11 56 13 Type SPI 3 Pass 4 Flash Status 00 USB 396KHz 4 1 2 Using the Memory Stick USB download Service Mode 1 Insert the USB memory stick to the ISB port 2 Automatically detect the SW Version S W download process is executed automatically 3 Show the message Copy the file from the Memory 4 After Finished the Download Automatically DC Off gt On 5 Check The update SW Version 4 2 Input tool option Adjust tool option refer to the BOM Tool Option Input PCBA Check Process Area Option Input Set Assembly Process After Input Tool Option and AC off Before PCBA check you have to change the Tool option and have to AC off
31. ning and service purposes Circuit Board Foil Repair Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that bonds the foil to the circuit board causing the foil to separate from or lift off the board The following guidelines and procedures should be followed whenever this condition is encountered At IC Connections To repair a defective copper pattern at IC connections use the following procedure to install a jumper wire on the copper pattern side of the circuit board Use this technique only on IC connections 1 Carefully remove the damaged copper pattern with a sharp knife Remove only as much copper as absolutely necessary 2 carefully scratch away the solder resist and acrylic coating if used from the end of the remaining copper pattern 3 Bend a small U in one end of a small gauge jumper wire and carefully crimp it around the IC pin Solder the IC connection 4 Route the jumper wire along the path of the out away copper pattern and let it overlap the previously scraped end of the good copper pattern Solder the overlapped area and clip off any excess jumper wire At Other Connections Use the following technique to repair the defective copper pattern at connections other than IC Pins This technique involves the installation of a jumper wire on the component side of the circuit board 1 Remove the defective copper pattern with a sharp knife Remove at least 1 4 inch of
32. ock MHz 1 720 480 15 73 59 94 13 500 SDTV DVD 480 5251 2 720 480 15 75 60 00 13 514 SDTV DVD 480l 5251 3 720 576 15 625 50 00 13 500 SDTV DVD 5761 6251 50Hz 4 720 480 31 47 59 94 27 000 SDTV 480P 5 720 480 31 50 60 00 27 027 SDTV 480P 6 720 576 31 25 50 00 27 000 SDTV 576P 50Hz 7 1280 720 44 96 59 94 74 176 HDTV 720P 8 1280 720 45 00 60 00 74 250 HDTV 720P 9 1280 720 37 50 50 00 74 25 HDTV 720P 50Hz 10 1920 1080 28 125 50 00 74 250 HDTV 10801 50Hz 11 1920 1080 33 72 59 94 74 176 HDTV 10801 12 1920 1080 33 75 60 00 74 25 HDTV 10801 13 1920 1080 56 25 50 148 5 HDTV 1080P 14 1920 1080 67 432 59 94 148 350 HDTV 1080P 15 1920 1080 67 5 60 00 148 5 HDTV 1080P Copyright O 2009 LG Electronics Inc All right reserved 7 LGE Internal Use Only Only for training and service purposes 7 7 1 Analog PC RGB DTV NOT SUPPORT Specification Proposed Bemark Resolution H freq kHz V freq Hz Pixel Clock MHz 1 640 350 31 468 70 09 25 17 EGA 2 720 400 31 469 70 09 28 32 DOS 3 640 480 31 469 59 94 25 17 VESA VGA 4 800 600 37 879 60 317 40 VESA SVGA 5 1024 768 48 363 60 004 65 VESA XGA 6 1280 768 47 776 59 87 79 5 VESA WXGA 7 1360 768 47 72 59 799 84 75 VESA WXGA 8 1280 1024 63 668 59 895 10
33. on Plug out and in If missing this process set can operate abnormally 1 Profile Must be changed the option value because being different with some setting value depend on module maker inch and market 2 Equipment adjustment remote control Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes 10 3 Adjustment method The input methods are same as other chassis Use IN START Key on the Adjust Remocon If not changed the option the input menu can differ the model spec Refer to Job Expression of each main chassis ass y for Option value Caution Don t Press IN STOP key after completing the function inspection 4 3 EDID D L method Recommend that don t connect HDMI and RGB D SUB cable when downloading the EDID If not possible recommend that connect the MSPG equipment There are two methods of downloading the edid data 4 3 1 1st Method EDID datas are automatically downloaded when adjusting the Tool Option2 Automatically downloaded when pushing the enter key after adjusting the tool option2 It takes about 2seconds T Home Use XA 2177 vin Home Use ADC CAL q Component 0 Component 80 0 X Component HD Mor yea OO 1 a Ares Option x Option 1 4 3 2 2nd Method Caution Must be checked that the tool option is right or not If tool option
34. t run pattern display 2 Release the DDC adjustment mode Release the adjust mode after AC off on or std by off on in status of finishing the Hear run mode Release the Adjust mode when receiving the aging off command F3 00 00 from adjustment equipment Need to transmit the aging off command to TV set after finishing the adjustment Check DDC adjust mode release by exit key and release DDC adjust mode 3 Enter the adjust mode of white balance Enter the white balance adjustment mode with aging command F3 00 FF Luminance min value is 150cd in the Cool Medium Warm mode For LCD 5 3 Adjustment of White Balance for Manual adjustment 1 Color analyzer CA100 CA210 should be used in the calibrated ch by CS 1000 2 Operate the zero calibration of the CA100 or CA 210 then stick sensor to the module when adjusting 8 For manual adjustment it is also possible by the following sequence 1 Select white pattern of heat run by pressing POWER ON key on remote control for adjustment then operate heat run longer than 15 minutes If not executed this step the condition for W B may be different 2 Push Exit key 3 Change to the AV mode by remote control 4 Input external pattern 8596 white pattern 5 Push the ADJ key gt Enter 0000 Password 6 Select 3 W B ADJUST 7 Enter the W B ADJUST Mode 8 Stick the sensor to the center of the screen and select each items Red Green Blue Gain and Offset
35. terlocks with which receivers covered by this service manual might be equipped 6 Do not apply AC power to this instrument and or any of its electrical assemblies unless all solid state device heat sinks are correctly installed 7 Always connect the test receiver ground lead to the receiver chassis ground before connecting the test receiver positive lead Always remove the test receiver ground lead last 8 Use with this receiver only the test fixtures specified in this service manual CAUTION Do not connect the test fixture ground strap to any heat sink in this receiver Electrostatically Sensitive ES Devices Some semiconductor solid state devices can be damaged easily by static electricity Such components commonly are called Electrostatically Sensitive ES Devices Examples of typical ES devices are integrated circuits and some field effect transistors and semiconductor chip components The following techniques should be used to help reduce the incidence of component damage caused by static by static electricity 1 Immediately before handling any semiconductor component or semiconductor equipped assembly drain off any electrostatic charge on your body by touching a known earth ground Alternatively obtain and wear a commercially available discharging wrist strap device which should be removed to prevent potential shock reasons prior to applying power to the Copyright 2009 LG Electronics Inc All right reserved 4
36. ve any excess or splashed solder with a small wire bristle brush LGE Internal Use Only IC Remove Replacement Some chassis circuit boards have slotted holes oblong through which the IC leads are inserted and then bent flat against the circuit foil When holes are the slotted type the following technique should be used to remove and replace the IC When working with boards using the familiar round hole use the standard technique as outlined in paragraphs 5 and 6 above Removal 1 Desolder and straighten each IC lead in one operation by gently prying up on the lead with the soldering iron tip as the solder melts 2 Draw away the melted solder with an anti static suction type solder removal device or with solder braid before removing the IC Replacement 1 Carefully insert the replacement IC in the circuit board 2 Carefully bend each IC lead against the circuit foil pad and solder it 3 Clean the soldered areas with a small wire bristle brush It is not necessary to reapply acrylic coating to the areas Small Signal Discrete Transistor Removal Replacement 1 Remove the defective transistor by clipping its leads as close as possible to the component body 2 Bend into a U shape the end of each of three leads remaining on the circuit board 3 Bend into a U shape the replacement transistor leads 4 Connect the replacement transistor leads to the corresponding leads extending from the circuit board and crimp the

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