LG 32LJ51 Series Service Manual Download Page 36 | Manualshive

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Standard Repair Process Detail Technical Manual

Measure DC Voltage applying to LED backlight from Main B/D

Error Symptom

A. Video Error, No Video/Normal Audio

Established date

A2

Content

Main Board to LED back light Voltage

Revised date

Copyright © 2017 LG Electronics. Inc. All rights reserved.

Only for training and service purposes.

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Summary of Contents for 32LJ51 Series

Page 1: ... LD76H MODEL 32LJ51 32LJ51 ZA ZC CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL LED TV SERVICE MANUAL CONFIDENTIAL Copyright 2017 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 2: ...Inc All rights reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 BLOCK DIAGRAM 10 EXPLODED VIEW 12 DISASSEMBLY GUIDE 13 TROUBLE SHOOTING GUIDE APPENDIX ...

Page 3: ...he 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 ...

Page 4: ...charge on your body by touching a known earth ground Alter natively obtain and wear a commercially available discharg ing wrist strap device which should be removed to prevent potential shock reasons prior to applying power to the 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 electrostati...

Page 5: ...oints 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...

Page 6: ...nia Bulgaria Croatia Czech Denmark Estonia Finland France Germany Greece Hungary Ireland Italy Kazakhstan Latvia Lithania Luxemburg Macedonia Morocco Netherlands Norway Poland Portugal Rumania Russia Serbia Slovakia Slovenia Spain Sweden Switzerland Turkey UK Ukraine DTV MPEG2 4 DVB T2 9 countries UK Denmark Sweden Finland Norway Ireland Ukraine Kazakhstan Mongolia DTV MPEG2 4 DVB C 39 countries A...

Page 7: ...VB T Guard Interval Bitrate_Mbit s 1 4 1 8 1 16 1 32 Modulation Code Rate QPSK 1 2 2 3 3 4 5 6 7 8 16 QAM 1 2 2 3 3 4 5 6 7 8 64 QAM 1 2 2 3 3 4 5 6 7 8 DVB T2 Guard Interval Bitrate_Mbit s 1 4 1 8 1 16 1 32 1 128 19 128 19 256 Modulation Code Rate QPSK 1 2 2 5 2 3 3 4 5 6 16 QAM 1 2 2 5 2 3 3 4 5 6 64 QAM 1 2 2 5 2 3 3 4 5 6 256 QAM 1 2 2 5 2 3 3 4 5 6 DVB C Symbolrate 4 0 Msymbols s to 7 2 Msymb...

Page 8: ...6 HDTV 720P 10 1920 1080 28 125 50 00 74 25 HDTV 1080I 11 1920 1080 33 75 60 00 74 25 HDTV 1080I 12 1920 1080 33 72 59 94 74 176 HDTV 1080I 13 1920 1080 56 25 50 00 148 50 HDTV 1080P 14 1920 1080 67 50 60 00 148 50 HDTV 1080P 15 1920 1080 67 432 59 94 148 352 HDTV 1080P 16 1920 1080 27 00 24 00 74 25 HDTV 1080P 17 1920 1080 26 97 23 94 74 176 HDTV 1080P 18 1920 1080 33 75 30 00 74 25 HDTV 1080P 19...

Page 9: ...576P DVB 6 1280 720 37 50 50 00 74 25 HDTV 720P DVB 7 1280 720 45 00 60 00 74 25 HDTV 720P 8 1280 720 44 96 59 94 74 176 HDTV 720P 9 1920 1080 28 12 50 00 74 25 HDTV 1080I DVB 10 1920 1080 33 75 60 00 74 25 HDTV 1080I 11 1920 1080 33 72 59 94 74 176 HDTV 1080I 12 1920 1080 56 25 50 00 148 50 HDTV 1080P DVB 13 1920 1080 67 50 60 00 148 50 HDTV 1080P 14 1920 1080 67 43 59 94 148 35 HDTV 1080P 15 192...

Page 10: ...UD_LRCH AUD_LRCK AUD_SCK Audio AMP IC5600 Connector P5601 HDMI1 JK800 USB JK700 DM DP USB1_OCP CTL DC DC OCP IC400 5V_USB NAND FLASH IC102 PCM_A 0 7 Buffer IC1902 TS_DATA 0 7 PCM_DATA 0 7 EPHY_TP TN RP RN LAN JK2100 Only UK COMPONENT JK2601 PCM_A 8 14 X tal TU_SCL SDA Tuner TU3703 IF_N IF_P IP_S IM_S QM_S QP_S IF_AGC_S IF_AGC LNB_OUT CI SLOT P1900 REAR SIDE TU_CVBS SIF DEMOD_SCL SDA LNB IC2701 LNB...

Page 11: ...SPK_L AMP_SCL SDA HDMI1 JK800 USB JK700 DM DP USB1_OCP CTL 5V_USB PCM_A 0 7 TS_DATA 0 7 PCM_DATA 0 7 COMPONENT JK2601 PCM_A 8 14 CI SLOT P1900 REAR SIDE HDMI2 JK801 SPDIF Jack SPDIF_OUT TU_SCL SDA R R Tuner TU3702 H NIM IF_N IF_P IF_AGC TU_CVBS SIF Buffer IC1902 DC DC OCP IC400 Audio AMP IC5600 Connector P5601 AUD_LRCH AUD_LRCK AUD_SCK One KEY LED_R IR I2C_Sensor Serial Flash IC1300 System EEPROM ...

Page 12: ...ical and mechanical parts in this chassis have special safety related characteristics These parts are identified by in the EXPLODED VIEW It 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 IMPORTANT SAFETY NOTICE ...

Page 13: ...cs Inc All rights reserved Only for training and service purposes DISASSEMBLY GUIDE 1 3 3 2 2 2 1 Unlock 1 1ea 2 3ea 3 2ea Screw to separate Back cover Rear Top using screw driver 2 Unlock Pull the upward with using snap Push A ...

Page 14: ...t LG Electronics Inc All rights reserved Only for training and service purposes 3 3 3 3 3 3 3 3 Separate Connectors 3 from Main and Module SPK 4 5 4 4 4 Unlock 4 10ea Screw to separate 5 Main PCB using screw driver ...

Page 15: ...ght LG Electronics Inc All rights reserved Only for training and service purposes 6 6 5 Separate 6 Speaker 2ea 8 7 7 7 7 8 9 9 6 Unlock 7 4ea Screw to separate 8 Vesa Supporter 9 Vesa Stand Supporter using driver ...

Page 16: ... 16 Copyright LG Electronics Inc All rights reserved Only for training and service purposes 7 Completed ...

Page 17: ...TROUBLE SHOOTING GUIDE Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 18: ...n off while viewing power auto on off 8 8 C Audio error No audio Normal video 9 9 Wrecked audio discontinuation noise 10 10 D Function error Remote control Local switch checking 11 11 External device recognition error 12 12 E Noise Circuit noise mechanical noise 13 13 F Exterior error Exterior defect 14 First of all Check whether there is SVC Bulletin in GSCS System for these model Contents of Sta...

Page 19: ...value before replacing the Main Board Replace Main Board Re enter White Balance value Precaution A4 A1 A2 A3 A6 First of all Check whether all of cables between board is inserted properly or not Main B D Adaptor LVDS Cable Speaker Cable IR B D Cable Normal Audio On Y N Normal Voltage Normal Voltage Y N Y N Error Symptom A Video Error Established date 1 14 Content No video Normal audio Revised date...

Page 20: ... D or Repair parts Replace Adaptor Normal Voltage Y N Error Symptom A Video Error Established date 2 14 Content No video No audio Revised date Standard Repair Process A13 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 21: ...g Diagnostics Setting on OSD Setting Customer Support red button on remote control Signal Test Signal strength Normal over 50 Signal quality Normal over 50 Y Contact with signal distributor or broadcaster Cable or Air N N Y N A6 End Normal Signal Normal Picture Normal Picture Normal Picture SVC Bulletin End End Normal Picture Error Symptom A Video Error Established date 3 14 Content Tuning fail Pi...

Page 22: ...heck satellite setting Check LNB frequency Check satellite Check Satellite connection DiSEqC motor etc Contact with signal distributor or broadcaster Cable or Air N Check Tuner soldering Replace Main B D Normal Picture Normal Picture Normal Setting SVC Bulletin Normal Signal End End Error Symptom A Video Error Established date 4 14 Content Tuning fail Picture broken freezing Revised date Standard ...

Page 23: ...ble Replace Main B D N A7 N Y Replace module Request repair for external device cable Check Test pattern A10 A8 A9 End Color error Color error External device Cable Normal External Input Component HDMI error Error Symptom A Video Error Established date 5 14 Content Color error Revised date Standard Repair Process Copyright 2017 LG Electronics Inc All rights reserved Only for training and service p...

Page 24: ...Box etc N Y Replace Main B D Check screen condition by input External Input Component AV HDMI Request repair for external device Check S W Version Y N S W Upgrade Y N Y N Replace Main B D Replace Module A7 A8 A9 Check Test pattern N End Screen normal Screen normal Screen normal Screen normal Screen normal End End Check Version Normal Screen External Input error Error Symptom A Video Error Establis...

Page 25: ...ace Main B D N Y Check ST BY 3 5V N Replace Adaptor or Replace Main B D Y A11 A16 Stand By Red Power LED On Normal Voltage Normal Operati on Error Symptom B Power Error Established date 7 14 Content No power Revised date Standard Repair Process End Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 26: ...OWEROFF_RESREC Power off by Reservated Record POWEROFF_RECEND Power off by End of Recording POWEROFF_SWDOWN Power off by S W Download POWEROFF_UNKNOWN Power off by unknown status except listed case Abnormal POWEROFF_ABNORMAL1 Power off by abnormal status except CPU trouble POWEROFF_CPUABNORMAL Power off by CPU Abnormal Please refer to the all cases which can be displayed on power off mode Adaptor ...

Page 27: ...r SPK Cable Replace Speaker or Main B D Connec tion Error Symptom C Audio Error Established date 9 14 Content No audio Normal video Revised date Standard Repair Process A15 Normal Audio End Y N Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 28: ...rnal device Replace Main B D N A13 End Signal Normal Normal Voltage Normal Audio Wrecked Audio Discontinuation Noise for all audio Wrecked Audio Discontinuation Noise only for D TV Wrecked Audio Discontinuation Noise only for Analog Wrecked Audio Discontinuation Noise only for External Input N Replace Main B D Error Symptom C Audio Error Established date 10 14 Content Wrecked audio Discontinuation...

Page 29: ...ck 3 5V On Main B D A16 N N Check Voltage 19V of Adaptor A13 Check IR Output signal N Y Replace IR B D N A16 Replace Main B D Y A16 End Normal Operating Normal Voltage Normal Signal Normal Operating Normal Operating End Y Error Symptom D Function Error Established date 11 14 Content Remote control Local switch checking Revised date Standard Repair Process Copyright 2017 LG Electronics Inc All righ...

Page 30: ...ith technical information Signal Input Technical information External Input and Component Recognition error HDMI Recognition error Error Symptom D Function Error Established date 12 14 Content External device recognition error Revised date Standard Repair Process Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 31: ... For models without any fix information provide the description or Mechanical noise is a natural phenomenon and apply the 1st level description When the customer does not agree apply the process by stage Describe the basis of the description in Part related to nose in the Owner s Manual Circuit noise Mechanical noise Error Symptom E Noise Established date 13 14 Content Circuit noise Mechanical noi...

Page 32: ...Replace stand Standard Repair Process Module damage Cabinet damage Remote Control damage Stand damage Error Symptom F Exterior Defect Established date 14 14 Content Exterior defect Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 33: ...able LVDS reconnection condition A8 A9 9 Adjustment Test pattern ADJ Key A10 10 11 A Video error_Vertical Horizontal bar residual image light spot Connection diagram A8 12 Check Link Cable LVDS reconnection condition A8 A9 13 Adjustment Test pattern ADJ Key A10 14 Appendix Defected Type caused by T Con Inverter Module Exchange T Con Board 1 A 1 5 15 Exchange T Con Board 2 A 2 5 16 Exchange LED dri...

Page 34: ...WER OFF MODE checking method A14 24 C Audio error_No audio Normal video Checking method in Setting when there is no audio A15 25 D Function error_ No response in remote control key error Remote control operation checking method A16 Contents of Standard Repair Process Detail Technical Manual First of all Check whether there is SVC Bulletin in GSCS System for these model Copyright 2017 LG Electronic...

Page 35: ...On disjoint back case check lighting Error Symptom A Video Error No Video Normal Audio Established date A1 Content Check Back Light On with Naked eye Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 36: ...age applying to LED backlight from Main B D Error Symptom A Video Error No Video Normal Audio Established date A2 Content Main Board to LED back light Voltage Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 37: ...e of Color Temp Cool Medium Warm re enter the value after replacing the MAIN BOARD Standard Repair Process Detail Technical Manual Error Symptom A Video Error No Video Normal Audio Established date A3 Content Check White Balance value Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 38: ...ltage 12V Error Symptom A Video Error No Video Normal Audio Established date A4 Content Power Voltage Measuring Method Revised date HD Model 27 30 pin FHD Model 48 51 pin Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 39: ...or 10dB 15dB 20dB etc Standard Repair Process Detail Technical Manual Error Symptom A Video Error Video lag stop Established date A5 Content Tuner Input Signal Strength Checking Method Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 40: ...control for adjustment Press the IN START with the remote control for adjustment Error Symptom A Video Error No Video Normal Audio Established date A6 Content Version Checking Method Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 41: ...heck the screen condition by signal Jack spec depending on Model Error Symptom A Video Error Vertical Horizontal bar Residual Image Light spot Established date A7 Content Connection diagram Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 42: ...d Repair Process Detail Technical Manual Error Symptom A Video Error Color Error Established date A8 A9 Content Check and replace Link Cable LVDS and contact condition Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 43: ...fective pixel 2 Residual image 3 MODULE error ADD BAR SCAN BAR 4 Video error Classification of MODULE or Main B D Error Symptom A Video Error Color Error Established date A10 Content Adjustment Test Pattern ADJ Key Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 44: ...t CNT Broken Solder defect CNT Broken Solder defect CNT Broken Solder defect CNT Broken Abnormal Power Section Solder defect Short Crack Abnormal Power Section Solder defect Short Crack Appendix Exchange T Con Board 1 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 45: ... Abnormal Power Section Solder defect Short Crack Fuse Open Abnormal power section Noise GRADATION GRADATION Abnormal Display Appendix Exchange T Con Board 2 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 46: ...e Module 1 Crosstalk Crosstalk Press damage Press damage Un repairable Cases In this case please exchange the module Press damage Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 47: ... Vertical Block Source TAB IC Defect Horizontal Block Gate TAB IC Defect Horizontal line Gate TAB IC Defect Gate TAB IC Defect Horizontal Block Gate TAB IC Defect Appendix Exchange the Module 2 Un repairable Cases In this case please exchange the module Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 48: ...ition Red Front LED control Setting Option Standby Light On Off Error Symptom B Power Error No Power Established date A11 Content Check front Display LED Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 49: ...al Error Symptom B Power Error No Power Established date A12 A13 Content Checking Method When Power is ON Revised date Check Voltage 19V of Adaptor Power Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 50: ...djustment item 3 Standard Repair Process Detail Technical Manual Error Symptom B Power Error Off when on off whiling viewing Established date A14 Content Power off Mode checking method Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 51: ...cess Detail Technical Manual Error Symptom C Audio Error No Audio Normal Video Established date A15 Content Checking method in Setting when there is no audio Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 52: ...n ON condition it is normal when the Analog Tester needle moves slowly and defective when it does not move at all Standard Repair Process Detail Technical Manual P4600 Sub Ass y Main Ass y Error Symptom D Function Error No Response in remote control Key error Established date A16 Content Remote control operation checking method Revised date Copyright 2017 LG Electronics Inc All rights reserved Onl...

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