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LG 43LT340C0DB Service Manual
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LG 43LT340C0DB Service Manual

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LED TV
SERVICE MANUAL
CHASSIS : LT9KB
MODEL : 43LT340C0DB
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71468401 (1907-REV00)
Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes.
CONFIDENTIAL

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  • Page 1 LED TV SERVICE MANUAL CHASSIS : LT9KB MODEL : 43LT340C0DB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL71468401 (1907-REV00) Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 2 SPECIFICATION ..................6 SOFTWARE UPDATE ................9 BLOCK DIAGRAM ................. 11 EXPLODED VIEW .................. 12 DISASSEMBLY GUIDE ................14 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

    Temp : 0 ~ 40 deg Humidity : ~ 80 % Storage Environment Temp : -20 ~ 60 deg Humidity : ~ 85 % - 6 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 7 47.712 60.015 85.50 VESA (WXGA) 1280*1024 63.981 60.020 108.0 VESA (SXGA) 1920*1080 66.587 59.934 138.5 HDTV 1080P 1920*1080 67.50 60.00 138.5 HDTV 1080P - 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 26.973 23.976 74.175 HDTV 1080P 1920*1080 33.75 30.00 74.25 HDTV 1080P 1920*1080 33.716 29.976 74.175 HDTV 1080P - 8 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 9: User Mode

    * If the software version on the USB device is equal to or lower than the version currently installed on the TV, it cannot be updated in User Mode (4) TV is updating. - 9 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 10 - The target files should be located in “LG_DTV” folder. (* Clone files should be copied to the root folder of the USB ) - The downloadable items differ depending upon model. - 10 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 11: Block Diagram

    BLOCK DIAGRAM - 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 EXPLODED VIEW (MODULE) IMPORTANT NOTICE MRC use only * MRC : Module Repair Center - 13 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 14: Disassembly Guide

    DISASSEMBLY GUIDE - 14 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 15 - 15 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 - 16 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 17 - 17 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 18 (Step 3) Disassemble the Case Top (Step 4) Remove the EMI Tape on the S-PCB and Separate the S-PCB *EMI Tape : 2ea - 18 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 (Step 8) Disassemble the DPS, and the Reflector * Rotate the DPS to remove (2 EA) * Be careful not to tear the Reflector sheet. - 19 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 20 2) Press the LED Array on the surface of Cover Bottom. 3) Connect the CNT to the LED Array. * LED Array Total 3ea - 20 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 21: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 22 Main PCB Main processor DDR Memory NAND Memory Power Audio AMP from PSU PANEL Local key Audio <SIZE: 174x183> Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 23 Interconnection Main PCB PANEL FFC Cable Local Key+IR ASSY SPEAKER Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 24 Circuit noise, mechanical noise F. Exterior error Exterior defect G.Commercial Feature IR OUT First of all, Check whether there is SVC Bulletin in GSCS System for these model. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 25 ☞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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 26 ☞A18 Check and Check voltage of No Video/ Normal replace Power Board ( 13V…) No audio voltage? MAIN B/D Replace Power Board and repair parts Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 27 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 28 Comp/AV/RGB normal error 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 29 Replace screen? Screen (Check normal operation of Main /T-con External Input, Comp/AV, normal? RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 30 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 31 "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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 32 13V 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 33 (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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 34 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 35 - Fix information information? signal Recognition error - S/W Version HDMI/ Check and fix Replace Main B/D Fix in external device/cable Recognition error accordance with technical information Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 36 “Part related to nose” in the Owner’s (For models without any fix information, Manual. provide the description) Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 37 Revised date 13/14 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote Replace remote control control damage Stand Replace stand dent Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 38 IR OUT Check Suitable Check Same Not working Replace MAIN Board RS-232 Connection Remote Controller Data Format as Guide data Format Change Remote Change cable Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 39 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 40 Voltage and speaker checking method when there is no audio D. Function error Remote control operation checking method IR OUT G. Commercial - Cable connection - Recommended data format Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 41 Content date <ALL MODELS> After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 42 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. (Cool/Medium/Warm), re-enter the value after replacing the MAIN BOARD. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 43 TUNER input signal strength checking method Content date <ALL MODELS> Menu/Setting  Channel  Manual Tuning When the signal is strong, use the attenuator (-10dB, - 15dB, -20dB etc.) Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 44 Version checking method Content date <ALL MODELS> 1. Checking method for remote control for adjustment Version Press the IN-START with the remote control for adjustment Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 45 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 46 Content Connection diagram (1) date * Interface Jack depends on model As the part connecting to the external input, check the screen condition by signal Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 47 Revised Content Check Link Cable(FFC) reconnection condition date <ALL MODELS> Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 48 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 49 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 50 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 51 Appendix : Exchange Power Board (PSU) No Light Dim Light Dim Light Dim Light No picture/Sound Ok A - 3/5 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 52 Appendix : Exchange the Module (1) Press damage Press damage Press damage Un-repairable Cases In this case please exchange the module. Crosstalk Crosstalk A - 4/5 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 53 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 54 Standard Repair Process Detail Technical Manual Error Established B. Power error _No power symptom date Revised Content Check front Power Indicator date <ALL MODELS> Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 55 Standard Repair Process Detail Technical Manual Error Established B. Power error _No power symptom date Revised Check power input voltage and ST-BY 3.5V Content date Check the DC 13V Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 56 POWER OFF MODE checking method date <ALL MODELS> Entry method 1. Press the IN-START button of the remote control for adjustment 2. Check the entry into adjustment item 3 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 57 1. Press the Setting/Menu button on the remote control 2. Select the Audio function of the Menu 3. Select the Sound Out 4. Select TV Speaker Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 58 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 59 2.Check the standby 3.5V 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. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 60 G. Commercial Feature symptom date Revised IR OUT Error Content date 1) Check the Cable Connection. 2) Check the “Suitable Data Format” of remote controller. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

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