LG 43UU340C Service Manual
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LG 43UU340C Service Manual

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LED TV
SERVICE MANUAL
CHASSIS : UA8BS
MODEL : 43UU340C
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL70879701(1807-REV00)
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means),
publication, modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you
have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual.
The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service
Manual.
Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
CONFIDENTIAL
43UU340C-UB

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Summary of Contents for LG 43UU340C

  • Page 1 Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service Manual.
  • Page 2 SPECIFICATION ..................6 SOFTWARE UPDATE ................9 BLOCK DIAGRAM ................. 10 EXPLODED VIEW .................. 11 DISASSEMBLY GUIDE ................12 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: Application Range

    Support TV Link Monitor Rear(1EA), Not support RS232C Command External Speaker 8Ω, Stereo, Max 1Watt Rear(1EA) Service Only PTC / CPU Debugging Rear(1EA) Rear(1EA) : LAN - 6 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 7 UDTV 2160P 3840*2160 56.25 25.00 297.00 UDTV 2160P 3840*2160 67.5 30.00 297.00 UDTV 2160P 4096*2160 53.95 23.97 296.70 UDTV 2160P 4096*2160 UDTV 2160P - 7 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 8 296.70 UDTV 2160P 4096*2160 67.5 30.00 UDTV 2160P 4096*2160 112.5 50.00 UDTV 2160P 4096*2160 134.86 59.94 593.40 UDTV 2160P 4096*2160 60.00 UDTV 2160P - 8 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 9: Auto Download

    (4) After download is completed, reboot is performed. (5) Check the SW version to see if it has been updated and check the Tool option. - 9 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 10: Block Diagram

    BLOCK DIAGRAM - 10 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 11: 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. - 11 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 12 Please do not assembled press curved portion (b) * Press direction (down from the outer surface) Please do assembled press Latch Zone (a) - 12 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 13 *SCREW TORQUE : SCREW : 5 ~ 7Kgf .cm SCREW : 5 ~ 7Kgf .cm SCREW : 5 ~ 7Kgf .cm Hook Latch - 13 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 14 Grip for disassembling B/C Bottom view of Back Cover - caution : Hook can be separated on the top position, don’t pull it hard for upward - 14 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 15: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 E. Noise Circuit noise, mechanical noise F. Exterior error Exterior defect First of all, Check whether there is SVC Bulletin in GSCS System for these model. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 17 Page Remarks MPI IR out error G. Commercial function error First of all, Check whether there is SVC Bulletin in GSCS System for these model. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 18 ☞A4 & A2 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 ☞A18 Check various Check and No Video/ voltages of Power Normal replace No audio Board (13.2V…) voltage? MAIN B/D Replace Power Board and repair parts Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 20 1. Reconnection 2. Install Booster S/W Upgrade Contact with signal distributor Normal or broadcaster (Cable or Air) Picture? Normal Picture? Replace Main B/D Close Close Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 21 /Cable device and error normal cable Request repair for external device/cable Check external External device device and Replace Main/T-con B/D HDMI /Cable cable error normal Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 22 Replace screen? Screen (Check normal operation of Main /T-con External Input, Component, normal? RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 23 Measure voltage of each output of Power B/D Normal? Normal Replace Main B/D voltage? Normal Close Check ST-BY 3.5V voltage? ☞A18 Replace Power B/D Replace Power Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 24 "POWEROFF_UNKNOWN" 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 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 25 13.2V of Power Screen normal voltage Speaker off Board Cancel OFF Replace Power Board and repair parts Check Replace MAIN Board Disconnection Speaker disconnection Replace Speaker Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 26 (In case of Connect and check Normal External Input other external audio? signal error) device Check and fix external device Check and fix external device Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 27 Replace Main B/D (Power B/D don’t have problem) If R/C operate, Normal Close operating? Explain the customer cause is interference from light in room. Replace R/C Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 28 Replace MR13 Close Down load the Firmware * If you conduct the loop at 3times, change the M4. * INSTART MENU14.RF Remocon Test3. Firmware download Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 29 INSTART menu Voltage? 1pin Main B/D ☞A24 Close Check & Repair Wifi cable connection ☞A4 Wi-Fi Mac value is “NG”? Close Change the Wifi assy Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 30 4.Camera operating error ☞A4 ☞A25 Check the Camera Ver. Reconnect the Normal Replace is “NULL”? INSTART menu operation? Camera module Main B/D Close Change the Camera module Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 31 Recognition error - S/W Version HDMI/ Check and fix DVI, Optical Replace Main B/D Fix in external device/cable Recognition error accordance with technical information Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 32 “Part related to nose” in the Owner’s then proceed as shown in the solution manual Manual. (For models without any fix information, provide the description) Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 33 Revised date 16/16 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote Replace remote control control damage Stand Replace stand dent Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 34 Not working Replace MAIN Board MPI Connection Data Format Remote Controller as Guide data Format Change Remote or Recommend Change cable using External IR for STB Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 35 Defected Type caused by T-Con/ Exchange Power Board (PSU) A-3/5 Inverter/ Module Exchange Module (1) A-4/5 Exchange Module (2) A-5/5 Continue to the next page Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 36 Voltage and speaker checking method when there is no audio Remote control operation checking method D. Function error Motion Remote operation checking method E. Commercial Function error Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 37 Check LCD back light with naked eye Content date After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 38 2. Enter into White Balance. 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 39 TUNER input signal strength checking method Content date <ALL MODELS>  Advanced Channels Channel Tuning Manual Tuning When the signal is strong, use the attenuator (-10dB, - 15dB, -20dB etc.) Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 40 Revised Version checking method Content date 1. Checking method for remote control for adjustment Version Press the IN-START with the remote control for adjustment Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 41 1. Check the signal strength or check whether the screen is normal when the external device is connected. 2. After measuring each voltage from power supply, finally replace the MAIN BOARD. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 42 Revised Content connection diagram (1) date As the part connecting to the external input, check the screen condition by signal Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 43 A. Video error_Color error symptom date Revised Content Check Link Cable(VX1/EPI) reconnection condition date Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 44 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!) Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 45 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 A - 1/5 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 46 Abnormal Power Section Abnormal Power Section Solder defect, Short/Crack Abnormal Display Fuse Open, Abnormal power section Solder defect, Short/Crack Noise GRADATION GRADATION A - 2/5 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 47 Appendix : Exchange Power Board (PSU) No Light Dim Light Dim Light Dim Light No picture/Sound Ok A - 3/5 Copyright © 2018 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 Crosstalk Crosstalk Un-repairable Cases In this case please exchange the module. A - 4/5 Copyright © 2018 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 A - 5/5 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 50 Established B. Power error _No power symptom date Revised Content Check front Power Indicator date ST-BY condition: On or Off Power ON condition: Turn Off Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 51 B. Power error _No power symptom date Revised Check power input voltage and ST-BY 3.5V Content date 49inch 43inch 55inch 65inch Check the DC 13.2V. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 52 POWER OFF MODE checking method date Entry method 1. Press the IN-START button of the remote control for adjustment 2. Check the entry into adjustment item 3 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 53 1. Press the Setting button on the remote control 2. Select the Sound function of the Menu 3. Select the Sound Out 4. Select TV Speaker Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 54 3.Connect the tester RX1 to the speaker terminal and if you hear the Chik Chik sound when you touch the GND and output terminal, the speaker is normal. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 55 2.Check the standby 3.5V on the terminal 4 pin (③) 3.AS checking the Pre-Amp(IR LED light) , the power is in ON condition, an Analog Tester needle should move slowly, otherwise, it’s defective. A22/A23 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 56 Revised IR OUT Error Content date 1) Check the Cable Connection.(IR Out supported by MPI Connection) 2) Check the “Suitable Data Format” of remote controller. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

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