LG UltraFine 27MD5KA Service Manual
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LG UltraFine 27MD5KA Service Manual

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UltraFine 5K MONITOR
SERVICE MANUAL
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO :
MFL69169559 (1803-REV01)
Copyright © 2016 - 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
LM6FB
27MD5KA
CONFIDENTIAL
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Summary of Contents for LG UltraFine 27MD5KA

  • Page 1 SERVICE MANUAL CHASSIS : LM6FB MODEL : 27MD5KA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL69169559 (1803-REV01) Copyright © 2016 - 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 2: Table Of Contents

    TROUBLE SHOOTING GUIDE ..............6 BLOCK DIAGRAM ................. 14 EXPLODED VIEW .................. 15 DISASSEMBLY ..................16 CHECK GUIDE ................ APPENDIX TRAINING MANUAL ..............APPENDIX - 2 - Copyright © LG Electronics Inc. All rights reserved. Only 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 training and service purposes.

  • Page 4: Specification

    Length :1.8m, Shape : USB-C , Color: Black, Pin 24 Sumitomo (Thunderbolt) Power Input: AC100~240V 50~60Hz, 2.5A Max Output: DC 20V 10A, 200W PSU - 4 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 5 2560 2560 x 1440 V(Lines) 1481 1440 H(Pixels) 938.36 177.72 5280 5120 5120 x 2880 (1) V(Lines) 2962 2880 * (1) : Preferred timing. - 5 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 6: Trouble Shooting Guide

    Check Thunderbolt3 Cable for Damage or Open Connector Check JK101 for proper Replace Connector connection or Damage Check connection for Check IC200 Thunderbolt3 in Source Check IC500 - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 7 Replace IC1104 & Voltage Level (3.3V) Recheck Replace IC203 Flash Check L305 Output Memory Voltage Level (0.9V) Check X200 Clock Replace X200 25MHz Replace IC200 - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 8 Voltage Level (1.1V) Recheck Check IC1103 Output Replace IC1103 & Voltage Level (1.5V) Recheck Check X500 Clock Replace X500 14.318MHz Replace IC501 Flash Memory - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 P501 (#9, #10 / #36, #37 ) Repair Main B/D Check MCX Cable for Damage or Replace Cable Open Conductors Replace T-Con Board or Module - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 5. No Charging, No Display Cable Connection To Macbook Pro Display ? Charging ? Q102 Short? Swap Q102 R118 Short Swap R118 - 10 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 11 Cable Connection To Macbook Pro Display ? Charging ? Swap TBT cable Display ? Swap Main B'd The unstable jack can make this issue. - 11 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 12 10V? Swap Module Almost Image Retention (Image Sticking) is from LCD Module. Before swapping LCD module, check the voltage (L504) is normal or not. - 12 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 13 Update macOS version version Cable Connection Display Push TBT cable to Jack Blinking? strongly Swap direction of TBT Cable Swap Main B'd Record swap parts - 13 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 14: Block Diagram

    BLOCK DIAGRAM - 14 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 15: 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. Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 16: Disassembly

    7) Unscrew the 7EA screw to detach Rear shield from LCM. 4) Disassemble the bottom of Cabinet by hand SCRE *Caution : Handle with care from scratch - 16 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 Push board top bottom area to lift the board from NUT. * Reference : LCM, Chassis Frame status iii) Push USB jack to lift the board from NUT. Power PCBA M ain PCBA - 17 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 18: Check Guide

    CHECK GUIDE Copyright ⓒ 2016 - 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 19 0.Connect PC and Monitor Thunderbolt3 Cable P/N : EAD63988301 1. Execute “DDCCI_TestApp.exe” Copyright ⓒ 2016 - 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 20 2. Connection to monitor ③Click Initialize ①Select ‘Secondary Display’ ②Check ‘DDCCI’ ④Click Get Aging ①②③④⑤⑥⑦⑧⑨⑩⑪⑫⑬⑭⑮ Copyright ⓒ 2016 - 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 21 Set : 100, Get : 100 ③ Click ‘Get Brightness’ ④ Click ‘Get Brightness’ Aging :0 ② Set #1~7 for aging pattern ① Click ‘Get Aging’ Copyright ⓒ 2016 - 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 22 4. Check Audio Before Check speaker, change the playback device as below. Play MP3 player and check sound and speaker Copyright ⓒ 2016 - 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 23 5. Check USB HUB Check the below 3 items USB Audio ALS (Ambient Light Sensor,조도센서) USB Hub Device Unknown USB device is no problem Copyright ⓒ 2016 - 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 24: Training Manual

    TRAINING MANUAL Copyright ⓒ 2016 - 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 25 ▶ Update the FW by LG Screen Manager • LG Screen Manager is an application that provides ScreenSplit and monitor software update features. • You can download and install the latest version from the LGE website (www.lg.com). - [LG Screen Manager] 1. Select the ‘Monitor Update’ menu 2.
  • Page 26 Main Board Check Guide After Repair P/N : EAD63932601 P/N : EAD63809902 (USB C to C Cable) (USB A to C Cable) Copyright ⓒ 2016 - 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 27 So, please replace the thunderbolt cable when swapping Check PCBA. Replace Q102 Q102 0 ohm Detail Check Replace Contents R118 R118 0 ohm Copyright ⓒ 2016 - 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

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