LG 40WT95UF Service Manual
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LG 40WT95UF Service Manual

LG 40WT95UF Service Manual

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LED MONITOR
SERVICE MANUAL
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL05789204 (2503-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 © 2025 LG Electronics Inc. All rights reserved. Only training and service purposes.
LM59A
40WT95UF
40WT95UF-WY

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Summary of Contents for LG 40WT95UF

  • 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: Table Of Contents

    SPECIFICATION ..................4 BLOCK DIAGRAM ................. 12 EXPLODED VIEW .................. 13 TROUBLE SHOOTING GUIDE ............... 14 DISASSEMBLE GUIDE ............APPENDIX1 SOFTWARE UPDATE GUIDE ..........APPENDIX2 - 2 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 3: Safety Precautions

    (including any expanded or moulded plastic packaging materials) and recycle or dispose of such packaging responsibly. Do not dispose any expanded plastic packaging in the household bin. - 3 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 4: General Specification

    5 / 7 / 9 Faster / Fast / Normal Uniformity Curved Multi EDID DisplayHDR 600 CTS1.2 Flicker Free Color Weakness Reader Mode VESA ClearMR - 4 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 5 USB3.2 Gen2 Bottom 5V/0.9A (Peripheral) (Downstream) USB-B (Upstream) USB-C USB3.2 Gen2 Rear 5V/0.9A (Downstream) USB3.2 Gen2 Bottom 5V/3A USB-C USB3.2 Gen2 Rear (Upstream) *w/o MFDP - 5 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 6 Auto Pivot Auto Pivot Category Item Support Applied Type Remark Sensor Option Application of RGB sensor TEMP Webcam Gyro *BLS : Backlight Sensor Presence Sensor - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 7 Normal(Fan Mode) Front 20dB(Fan Mode) Distance : 100 cm Brightness of OSD menu : 100 level Back 26dB(Fan Mode) Dimming(No Signal) Front 18dB Back 20dB - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 8 5120 x 191.145 85.029 H(Pixels) 1052.060 5504 5120 2160 V(Lines) 2248 2160 5120 x 226.579 100.035 H(Pixels) 1247.090 5504 5120 2160 V(Lines) 2265 2160 - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 5120 x 191.148 85.030 H(Pixels) 1009.260 5280 5120 2160 V(Lines) 2248 2160 5120 x 226.580 100.035 H(Pixels) 1196.340 5280 5120 2160 V(Lines) 2265 2160 - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 5120 x 191.148 85.030 H(Pixels) 1009.260 5280 5120 2160 V(Lines) 2248 2160 5120 x 226.580 100.035 H(Pixels) 1196.340 5280 5120 2160 V(Lines) 2265 2160 - 10 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 11 (Preset Mode) Frequency(kHz) Frequency(Hz) 480P 31.5 0x01 720P 45.0 0x04 1080P 67.5 0x10 1080P 135.0 0x3F 2160P 135.0 0x61 2160P 255.0 0x76 2160P 135.0 0x7E - 11 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 12: Block Diagram

    BLOCK DIAGRAM - 12 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 13: 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. - 13 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 14: Trouble Shooting Guide

    Check IC802 output Change IC802 voltage level (3.3V) Check IC809 output Change IC809 voltage level (0.95V) Check IC808 output voltage level (0.95V) Change IC100 - 14 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 15 Check if the FFC cable is damaged Check IC801 output voltage Change IC801 or poor connection (P601) level (3.3V) Damage: Replace the cable Change LCD Module Poor connection : Reconnection - 15 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 16 Check if the input signal is supported Check if the HDMI cable is damaged or Change Cable Poor Connection. Change Connector Check if JK102/JK103 is damaged Change Scaler(IC100) - 16 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 Check if the input signal is supported Check if the DP cable is damaged or Change Cable Poor Connection. Change Connector Check if JK100 is damaged Change Scaler(IC100) - 17 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 Check if the input signal is supported Check if the TBT/USB-C cable is damaged or Change Cable Poor Connection. Change Connector Check if JK1100 is damaged Change Scaler(IC100) - 18 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 19: Disassemble Guide

    DISASSEMBLE GUIDE...

  • Page 20: Disassembly Process

    Disassembly process * Tools Tool Description Tool Size (if applicable) Screw driver Plastic Jig * Disassemble Process ③ Insert Hera Jig at Upper Center point and ① Put the Set on the Jig ② loosen the screw disassemble Back Cover Assy (from the start point to the left and right direction) ④...
  • Page 21 Disassembly process ⑥ Remove M3 screw 4EA by screw driver to get Main PCB ⑦ Remove M3 screw 5EA by screw driver to get PSU RGB PCB (Screw 1EA) LCD module Main PCB (Screw 4EA) PSU (Screw 5EA) USB PCB Assy (Latch 2EA) Joystick PCB Assy (Latch 2EA)

  • Page 22: Software Update Guide

    SOFTWARE UPDATE GUIDE...
  • Page 23 ▶ Download Jig Connection Connect the jig to the monitor and PC LG common JIG Mstar JIG To monitor HDMI port To PC USB port To monitor HDMI port To PC USB port 2. Unzip and install the driver files below...
  • Page 24 Use tool version 5.1.6 or higher ▶ Scaler F/W Update Guide 2. After selecting the “Connect” button, 1. After selecting the “Config” button, check the settings below. check the connection completion message Connection complete message 4. After selecting the “Auto” button (1) and checking the checkbox 3.

  • Page 25: Service Menu

    Service menu ▶ How to enter service menu Step1. Turn monitor off and wait 5sec. item Description CLEAR ETI Reset elapsed time. -CLEAR ETI. Item is hidden. Move focus as left side. -Keep pushing Left(or right) key over 5sec to run CELAR ETI. NVRAM Reset below data.
  • Page 26 Power History Message Description Power on/off by connecting/disconnecting AC power Power on/off using joystick key Reset Power on/off by General > Reset to Initial Settings Signal Power on by getting signal Cable Detect Power on by detecting cable connection while monitor is in DPM IR Power (Remote controller models only) Power on using remote controller power button IR Input...

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