LG UltraFine 27MD5KA Service Manual Download Page 6 | Manualshive

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LG Electronics Inc. All rights reserved.

Only training and service purposes.

TROUBLE SHOOTING GUIDE

1. No Video – Thunderbolt3

Check connection for

Thunderbolt3 in Source

Check input signal format

Is it supported?

Check JK101 for proper

connection or Damage

Replace Connector

Y

N

Y

Check Thunderbolt3 Cable for

Damage or Open Connector

Y

Check IC200

N

Check IC500

Y

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Summary of Contents for UltraFine 27MD5KA

Page 1: ...ICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL SERVICE MANUAL Copyright 2016 2018 LG Electronics Inc All rights reserved Only training and service purposes CONFIDENTIAL MFL69169559 1803 REV01 LM6FB 27MD5KA UltraFine 5K MONITOR ...

Page 2: ... All rights reserved Only training and service purposes CONTENTS 2 SAFETY PRECAUTIONS 3 SPECIFICATION 4 TROUBLE SHOOTING GUIDE 6 BLOCK DIAGRAM 14 EXPLODED VIEW 15 DISASSEMBLY 16 CHECK GUIDE APPENDIX TRAINING MANUAL APPENDIX CONTENTS ...

Page 3: ...l shock Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed metallic parts such as antenna terminals phone jacks etc If the exposed meta...

Page 4: ...hunderbolt3 Power Delivery USB Audio Speaker Mic Webcam Ambient Light Sensor HDCP2 2 7 Input Thunderbolt3 Thunderbolt3 input USB C Type USB USB3 0 2 0 communication In TBT3 Jack USB down USB3 0 Downstream x 3 Audio USB data format Audio Camera Full HD Web Camera Module LGIT Microphone 1xDigital MEMS Mic LGIT ALS Ambient Light Sensor LGIT 8 Power Code Length 1 80 Shape Wall out Color Black Weight 0...

Page 5: ...orch F Resolution 1 H Pixels 593 82 142 2 4176 4096 8 32 40 4096 x 2304 V Lines 60 2370 2304 1 8 57 2 H Pixels 522 61 133 32 3920 3840 8 32 40 3840 x 2160 V Lines 60 2222 2160 1 8 53 3 H Pixels 364 47 111 12 3280 3200 8 32 40 3200 x 1800 V Lines 60 1852 1800 1 8 43 4 H Pixels 234 59 88 86 2640 2560 8 32 40 2560 x 1440 V Lines 60 1481 1440 1 8 32 5 H Pixels 938 36 177 72 5280 5120 16 64 80 5120 x 2...

Page 6: ...s TROUBLE SHOOTING GUIDE 1 No Video Thunderbolt3 Check connection for Thunderbolt3 in Source Check input signal format Is it supported Check JK101 for proper connection or Damage Replace Connector Y N Y Check Thunderbolt3 Cable for Damage or Open Connector Y Check IC200 N Check IC500 Y ...

Page 7: ... Video Thunderbolt3_Check IC200 Replace X200 N Check C1102 Voltage Level 20V Check Power connector OK Replace PSU Y N Y Check IC1104 Output Voltage Level 3 3V Replace IC1104 Recheck Y N Check X200 Clock 25MHz Replace IC203 Flash Memory Y Check L305 Output Voltage Level 0 9V Y N Replace IC200 ...

Page 8: ...X500 N Check C1102 Voltage Level 20V Check Power connector OK Replace PSU Y N Y Check IC1101 Output Voltage Level 3 3V Replace IC1101 Recheck Y N Check X500 Clock 14 318MHz Replace IC501 Flash Memory Y Check IC1103 Output Voltage Level 1 5V Replace IC1103 Recheck Y N Check IC1102 Output Voltage Level 1 1V Replace IC1102 Recheck N Y ...

Page 9: ...IC800 Replace LED Driver IC Y N N Check Panel Power 10V L1107 Check IC1100 Output 10V Replace IC1100 Recheck Y N Check Panel eDP AUX P501 9 10 36 37 Check IC500 Repair Main B D Y N Check MCX Cable for Damage or Open Conductors Check LED Driver Output P800 3 4 Replace T Con Board or Module Y Check IC500 Replace Main SOC N Check WLED_ENABLE High Y ...

Page 10: ...yright LG Electronics Inc All rights reserved Only training and service purposes 5 No Charging No Display Display Cable Connection To Macbook Pro Charging Swap R118 No No Yes No Swap Q102 Q102 Short R118 Short ...

Page 11: ...onics Inc All rights reserved Only training and service purposes 6 Charging but No Display Display Cable Connection To Macbook Pro Charging No Yes No Swap Main B d Display Swap TBT cable The unstable jack can make this issue ...

Page 12: ...vice purposes 7 Image Retention Image Retention Yes Yes Swap Module Almost Image Retention Image Sticking is from LCD Module Before swapping LCD module check the voltage L504 is normal or not Power On Off Image sticking Check L504 voltage Voltage L504 is 10V Swap Main B d No ...

Page 13: ...rved Only training and service purposes 8 Display Blinking Cable Connection Record swap parts macOs is the latest version Swap direction of TBT Cable Display Blinking Push TBTcable to Jack strongly No Update macOS version No 1st 2nd Swap Main B d 3rd ...

Page 14: ...Ie Down1 USB I2S Flash 8Mb Audio Amplifier I2S Container ID USB C Hub Down1 Down2 Down3 Down4 Upstream Flash 8Mb VBUS VBUS VBUS USB C USB C USB C Down2 USB I2C I2C I2S0 I2S1 MIC EQ Fan 80x80 1500 Thermal Sensor MM3286 ALS BLU LGD 4CH 145mA 500nit typ TCON LGD 27 eDP 5120x2880 BLU Driver I2S Speaker I2C I2C ISP MIPI to USB CIL PWM Hsync FW Update SPI SPI I2C eDP eDP eDP HBR2 4lane x 2 GPIO BLC EN L...

Page 15: ...characteristics These parts are identified by in the 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 IMPORTANT SAFETY NOTICE 900 300 200 140 830 580 530 545 540 130 120 700 AM1 400 220 ...

Page 16: ...semble the bottom of Cabinet by hand Caution Handle with care from scratch 5 Disassemble the bottom of Back cover by hand Caution Handle with care from scratch and latch broken Pull back cover softly to disassemble the latch i Bottom disassemble ii Left Right side disas semble iii Top disassemble 6 Disassemble LED Harness eDP cable Camera Harness and Tape 7 Unscrew the 7EA screw to detach Rear shi...

Page 17: ...ding i Push board right bottom area to lift the board from NUT ii Push board top bottom area to lift the board from NUT iii Push USB jack to lift the board from NUT 9 Disassemble Vertically Board from Rear shield to prevent USB jack bending and Check the USB jack Deformation and bending or not Reference LCM Chassis Frame status Board NUT NUT NUT USB Jack LCM Power PCBA Main PCBA ...

Page 18: ...CHECK GUIDE Copyright ⓒ 2016 2018 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 19: ...1 Execute DDCCI_TestApp exe 0 Connect PC and Monitor Thunderbolt3 Cable P N EAD63988301 Copyright ⓒ 2016 2018 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 20: ... Select Secondary Display Check DDCCI Click Initialize 2 Connection to monitor Click Get Aging Copyright ⓒ 2016 2018 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 21: ...ging mode Click Get Aging Aging 0 Set 1 7 for aging pattern Click Get Brightness Click Get Brightness 1 100 Set 100 Get 100 Copyright ⓒ 2016 2018 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 22: ...eck 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: ... 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 Copyright ⓒ 2016 2018 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 25: ...can download and install the latest version from the LGE website www lg com LG Screen Manager 1 FW update method 1 Select the Monitor Update menu 2 Select the FW image Zip file 3 Progress the update 4 Complete the Update Press the Restart button Copyright ⓒ 2016 2018 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 26: ...63932601 USB C to C Cable Cable Window PC picture voice Interface USB A to C Cable USB C to C Cable Testing is possible by installing pattern program in Windows PC Since it is Thunderbolt3 exclusive model no other input is available For repair result check up Thunderbolt3 Host equipment is needed Picture and Sound Camera Function can be checked tru Mac PC Since it is USB C type model no other inpu...

Page 27: ...e reason that no TBT responses Detail Contents PCB P N EAX67089601 Title No TBT3 Thunderbolt 3 Connection Domestic Overseas consultant customer Product Monitor Product MD5K Model 27MD5KA Troubleshooting Operation Installation Issue Function Detail issue Unable to Charging function and No display Check Q102 0 ohm Replace Q102 Check R118 0 ohm Replace R118 No Only PCB P N EAX67089601 Yes No Check Th...

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