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LG 32LJ51-ZA Series Service Manual
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LG 32LJ51-ZA Series Service Manual

Chassis : ld76h
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LED TV
SERVICE MANUAL
CHASSIS : LD76H
MODEL : 32LJ51**
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL69739903 (1704-REV00)
Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
CONFIDENTIAL
32LJ51**-ZA/ZC

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Summary of Contents for LG 32LJ51-ZA Series

  • Page 1 LED TV SERVICE MANUAL CHASSIS : LD76H MODEL : 32LJ51** 32LJ51**-ZA/ZC CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL69739903 (1704-REV00) Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 2 SERVICING PRECAUTIONS ..............4 SPECIFICATION ..................6 BLOCK DIAGRAM ................. 10 EXPLODED VIEW .................. 12 DISASSEMBLY GUIDE................13 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 3: Safety Precautions

    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. - 3 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 4: Servicing Precautions

    - 4 - Copyright © LG Electronics. Inc. All rights reserved. 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. Only for training and service purposes.

  • Page 6: Specification

    TELSAT-W2A, HOTBIRD 6/8/9, EUTELSAT-SESAT, ASTRA 1L/H/M/KR, ASTRA 3A/3B, BADR 4/6, ASTRA 2D, EUROBIRD 3, EUTELSAT-W7, HEL- LASSAT 2, EXPRESS AM1, TURKSAT 2A/3A, INTERSAT10 - 6 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 7 Component & AV Component & AV’s audio input is used by common port USB (1EA) EMF, Xvid HD, For SVC (download) JPEG, MP3, DivX HD - 7 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 8 27.00 24.00 74.25 HDTV 1080P 1920*1080 26.97 23.94 74.176 HDTV 1080P 1920*1080 33.75 30.00 74.25 HDTV 1080P 1920*1080 33.71 29.97 74.176 HDTV 1080P - 8 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 9 V-freq (Hz) Pixel clock (MHz) Proposed 3D input proposed mode 1920*1080 33.75 74.25 HDTV 1080P Side by Side, Top & Bottom, JPS, MPO(Photo) - 9 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 10: Block Diagram

    BLOCK DIAGRAM 1.EU/CIS : T2/C/S2 : LJ51_V/U: LD76H - 10 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 11 2. EU : T/C : LJ51_0/B : LD76H - 11 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 12: 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. - 12 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 13: Disassembly Guide

    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”). - 13 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 14 3. Separate Connectors “3” from Main and Module & SPK 4. Unlock “4”(10ea) Screw to separate “5”(Main PCB) using screw driver - 14 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 15 5. Separate “6” Speaker (2ea) 6. Unlock “7”(4ea) Screw to separate “8”(Vesa Supporter), “9”(Vesa &Stand Supporter) using driver - 15 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 16 7. Completed - 16 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 17: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 18 Wrecked audio/discontinuation/noise Remote control & Local switch checking D. Function error External device recognition error E. Noise Circuit noise, mechanical noise F. Exterior error Exterior defect Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 19 ☞A3 & A6 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 20 No video / No audio Revised date ☞A13 No video / Check voltage 19V Normal Replace Main No audio of Adaptor Voltage B/D or Repair parts Replace Adaptor Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 21 Tuner soldering Picture 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 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 22 (DiSEqC, motor, etc…) Contact with signal S/W Upgrade Replace satellite setting distributor (match with installed ANT) or broadcaster (Cable or Air) Normal Normal Picture Picture Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 23 External ☞A10 Input Check external device/ Check Test pattern Component, device and Replace Main B/D Cable HDMI cable Normal error Request repair for external device/cable Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 24 Main B/D (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 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 25 Stand-By : Red 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 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 26 "POWEROFF_UNKNOWN" Power off by unknown status except listed case Power off by abnormal status except CPU trouble "POWEROFF_ABNORMAL1" Abnormal Power off by CPU Abnormal "POWEROFF_CPUABNORMAL" Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 27 Check user No audio Connection Replace Speaker Connec Screen normal from Main  or Main B/D tion Speaker Cable Insert wafer SPK Cable Normal Audio Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 28 Normal 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 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 29 When turn off light 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 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 30 Input - Fix information information Recognition error - S/W Version Fix in Check and fix accordance HDMI external device/cable with technical Recognition error information Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 31 ※ Describe the basis of the description in shown in the solution manual “Part related to nose” in the Owner’s Manual. (For models without any fix information, provide the description) Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 32 Revised date Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote Control Replace remote control damage Stand Replace stand damage Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 33 A-2/5 <Appendix> 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 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 34 Checking method in Setting when there is no C. Audio error_No audio/Normal video audio D. Function error_ No response in remote Remote control operation checking method control, key error Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 35 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 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 36 A. Video Error, No Video/Normal Audio Established date Content Main Board to LED back light Voltage Revised date Measure DC Voltage applying to LED backlight from Main B/D Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 37 2. Enter into White Balance of item 11 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 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 38 Content Power Voltage Measuring Method Revised date HD Model : 27 ~ 30 pin FHD Model : 48 ~ 51 pin Check LVDS Voltage 12V Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 39 Tuner Input Signal Strength Checking Method Revised date Setting  Programmes  signal test  Select channel When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 40 Established date Content Version Checking Method Revised date Checking SW version method for remote control for adjustment Press the IN-START with the remote control for adjustment Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 41 Connection diagram Revised date As the part connecting to the external input, check the screen condition by signal * Jack spec. : depending on Model Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 42 A. Video Error, Color Error Established date Content Check and replace Link Cable(LVDS) and contact condition Revised date 1. Check and replace LVDS Cable 2. Check LVDS connection condition Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 43 You can view 10 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) Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 44 T-Con Defect, CNT Broken 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 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 45 Appendix : Exchange T-Con Board (2) Abnormal Power Section Abnormal Power Section Solder defect, Short/Crack Abnormal Display Fuse Open, Abnormal power section Solder defect, Short/Crack Noise GRADATION GRADATION Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 46 Appendix : Exchange the Module (1) Press damage Press damage Press damage Un-repairable Cases In this case please exchange the module. Crosstalk Crosstalk Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 47 Gate TAB IC Defect Gate TAB IC Defect Un-repairable Cases In this case please exchange the module. Horizontal Block Gate TAB IC Defect Gate TAB IC Defect Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 48 B. Power Error, No Power Established date Content Check front Display LED Revised date ST-BY condition: Red Front LED control : Setting  Option  Standby Light  On/Off Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 49 Error Symptom B. Power Error, No Power Established date A12/ 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 Power off Mode checking method Revised date 1. Press the IN-START button of the remote control for adjustment 2. Check the entry into adjustment item 3 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 51 C. Audio Error, No Audio/Normal Video Established date Content Checking method in Setting when there is no audio Revised date Check Connection from Main B/D to Speaker Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 52 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. Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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