LG 43LH51 Series Service Manual
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LG 43LH51 Series Service Manual

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LED TV
SERVICE MANUAL
CHASSIS : LJ67A
MODEL : 43LH51**
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL69464702 (1601-REV00)
49LH51**
Internal Use Only
43LH51**-S*
49LH51**-S*

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Summary of Contents for LG 43LH51 Series

  • Page 1 Internal Use Only LED TV SERVICE MANUAL CHASSIS : LJ67A MODEL : 43LH51** 43LH51**-S* MODEL : 49LH51** 49LH51**-S* CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL69464702 (1601-REV00)
  • Page 2 SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION ..............9 BLOCK DIAGRAM ................... 15 EXPLODED VIEW .................. 16 DISASSEMBLY ..................17 TROUBLESHOOTING ............... APPENDIX - 2 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 3: Safety Precautions

    An other abnormality exists that must be corrected before the receiver is returned to the customer. - 3 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 4: Servicing Precautions

    - 4 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 5 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. - 5 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 6: Application Range

    Temp : 0 ~ 40 deg Humidity : ~ 80 % Storage Environment Temp : -20 ~ 60 deg Humidity : ~ 85 % - 6 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 7: Component Input

    47.71 60.01 85.50 VESA (WXGA) 1280*1024(FHD Only) 63.98 60.02 108.00 VESA (SXGA) 1920*1080(FHD Only) 67.50 60.00 148.5 HDTV 1080P - 7 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 8 Max Vertical Freq - 62 Hz Min Horiz. Freq - 30 kHz Max Horiz. Freq - 83 kHz Pixel Clock - 160 MHz - 8 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Adjustment Instruction

    (5) Click “Auto” tab and set as below. (6) Click “Run”. (7) After downloading, check “OK” message. filexxx.bin (7)...OK - 9 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 10: Adjustment Preparation

    ▪ AUO, INX, Sharp, CSOT, BOE Module.( In the case of , the color temperature spec of cool mode is 13000K) Cool Medium Warm spec target - 10 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 11 ON, OFF. Default is inner (ON). By selecting OFF, you can adjust using RF signal in 206 Gray pattern. - 11 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 12 JIG model. ▪ Push the “IN STOP KEY” after completing the function inspection. - 12 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 13 Physical Address (0x1E) HDMI 1 3F / 1B HDMI 2 3F / 0B - HDMI1/2 (128) - HDMI1 (256) - 13 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 14 NEUTRAL. 2) 2 Poles - Hi-pot Test = Accessible Metal and LIVE & NEUTRAL. (4) LEAKAGE CURRENT: At 0.5mArms - 14 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15: Block Diagram

    BLOCK DIAGRAM - 15 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 16: Exploded View

    Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. - 16 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 (4) Put ‘long nose’ into the hole SCREW : 5 ~ 7Kgf.cm t< 3.0mm SCREW : 5 ~ 7Kgf.cm - 17 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 19: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 20 Remote control & Local switch checking D. Function error External device recognition error E. Noise Circuit noise, mechanical noise F. Exterior error Exterior defect LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 21 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 22 Revised date ☞A13 No video / Check voltage 19V Normal Replace Main No audio of Adaptor Voltage B/D or Repair parts Replace Adaptor LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 23 1. Reconnection 2. Install Booster Replace S/W Upgrade Normal Contact with signal distributor Main B/D Picture or broadcaster (Cable or Air) Normal Picture LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 24 Contact with signal Replace satellite setting S/W Upgrade distributor (match with installed ANT) or broadcaster (Cable or Air) Normal Normal Picture Picture LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 25 Check external Compon device/ Check Test pattern device and Replace Main B/D ent, Cable cable HDMI Normal error Request repair for external device/cable LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 26 (Component/AV/ error and HDMI by connecting HDMI) Jig, pattern Generator, Set-top Box etc. S/W Upgrade Request repair for external device Normal Screen LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 27 Check Adaptor/ Power cord was inserted properly Power LED On ※ ☞A16 Normal Check ST-BY 3.5V Voltage Replace Adaptor or Replace Main B/D LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 28 Power off by unknown status except listed case "POWEROFF_ABNORMAL1" Power off by abnormal status except CPU trouble Abnormal "POWEROFF_CPUABNORMAL" Power off by CPU Abnormal LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 29 No audio Connection Replace Speaker Connec from Main  Screen normal or Main B/D tion Speaker Cable Insert wafer SPK Cable Normal Audio LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 30 Request repair to external Audio cable/ANT provider (In case of External Input Check and fix external device signal error) Check and fix external device LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 31 Baterry of R/C in room If R/C operate, Explain the customer Normal cause is interference Operating from light in room. Replace R/C LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 32 - Fix information information Recognition error - S/W Version Fix in Check and fix accordance HDMI external device/cable with technical Recognition error information LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 33 “Part related to nose” in the Owner’s Manual. shown in the solution manual (For models without any fix information, provide the description) LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 34 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote Controller Replace remote controller damage Stand Replace stand damage LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 35 Exchange LED driver Board (PSU) A-3/5 Defected Type caused by T-Con/ Inverter/ Module Exchange Module itself (1) A-4/5 Exchange Module itself (2) A-5/5 LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 36 Checking method in menu when there is no audio D. Function error_ No response in remote Remote controller operation checking method controller, key error LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 37 A. Video Error, No Video/Normal Audio Established date Content Check Back Light On with Naked eye Revised date Power On -> disjoint back case -> check lighting LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 38 Established date Content Main Board to LED back light Voltage Revised date Measure DC Voltage applying to LED backlight from Main B/D LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 39 3. After recording the R, G, B (GAIN, Cut) value of Color Temp (Cool/Medium/Warm), re-enter the value after replacing the MAIN BOARD LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 40 Power Voltage Measuring Method Revised date HD Model : 27 ~ 30 pin FHD Model : 48 ~ 51 pin Check LVDS 12V LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 41 MENU  Press red key Remote controller  signal test  Select channel When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 42 LCD-TV Version Checking Method Revised date Checking SW version method for remote controller for adjustment Press the IN-START with the remote controller for adjustment LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 43 Revised date As the part connecting to the external input, check the screen condition by signal * Jack spec. : depending on Model LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 44 Content Check and replace Link Cable(LVDS) and contact condition Revised date 1. Check and replace LVDS Cable 2. Check LVDS connection condition LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 45 You can view 6 types of patterns using the ADJ Key Checking item : 1. Defective pixel 2. Residual image 3. MODULE error (ADD-BAR,SCAN BAR..) 4.Video error (Classification of MODULE or Main-B/D) LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 46 Abnormal Power Section Solder defect, CNT Broken Solder defect, CNT Broken T-Con Defect, CNT Broken Abnormal Power Section Solder defect, Short/Crack Solder defect, Short/Crack LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 47 Abnormal Power Section Abnormal Power Section Solder defect, Short/Crack Abnormal Display Fuse Open, Abnormal power section Solder defect, Short/Crack Noise GRADATION GRADATION LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 48 Appendix : Exchange the Module (1) Press damage Press damage Press damage Un-repairable Cases In this case please exchange the module. Crosstalk Crosstalk LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 49 Gate TAB IC Defect Un-repairable Cases In this case please exchange the module. Horizontal Block Gate TAB IC Defect Gate TAB IC Defect LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 50 Content Check front Display LED Revised date ST-BY condition: Red Front LED control : Menu  Option  Standby Light  On/Off LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 51 B. Power Error, No Power Established date A12/ Content Checking Method When Power is ON Revised date Check Voltage 19V of Adaptor Power LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 52 Power off Mode checking method Revised date 1. Press the IN-START button of the remote controller for adjustment 2. Check the entry into adjustment item 3 LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 53 C. Audio Error, No Audio/Normal Video Established date Content Checking method in menu when there is no audio Revised date Check Connection from Main B/D to Speaker LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 54 4. When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog Tester needle moves slowly, and defective when it does not move at all. LGE Internal Use Only Copyright 2016 LG Electronics Inc. All rights reserved. Only for training and service purposes...

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