LG Ultrafine 5k 27MD5KA-B: Difference between revisions

LG Ultrafine 5k 27MD5KA-B
Manufacturer	LG
Code name
Release date	2017-04-20
Device type	Television/Monitor

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Latest revision as of 11:17, 2 March 2024

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Guides

Explanatory Guides

Repair Guides

	Affects part	Type	Difficulty
LG Ultrafine 5k 27MD5KA-B Display completely unresponsive repair	Logic Board	Soldering	3. Hard
LG Ultrafine 5k 27MD5KA-B Display completely unresponsive test mode fails repair	PSU	Part replacement	1. Easy
LG Ultrafine 5k 27MD5KA-B Randomly going to sleep or doesnt wake up repair	Logic Board	Soldering	3. Hard

Create a Guide

Device pictures

Display model

PCB pictures

Please consider contributing pictures to this section!

Reference measurements (also schematics if available)

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More Information/External Sources

This model seems to have a prone-to-dying Texas Instruments USB-C PD + Thunderbolt multiplexer controller "TPS65983" as ive seen two (suspecting 3) models with it being the cause of the display not working. Issue can stem from other places as well, like power supply (fuses etc).

How to use test mode:

Location of the button, make sure power is plugged in while testing. 1. power plug 2. test mode button
What the display should show if test mode works

External references and other people having issues:

People complaining about loose main port: https://maker.pro/forums/threads/lg-ultrafine-27md5ka-b-provides-power-to-laptop-but-does-not-get-detected-by-computer-no-video.292861/

Cable issues: https://discussions.apple.com/thread/252555535

Francis (fronke_ on discord): These are my own observations, but a quick google shows others having similar issues.

I have had 3 identical models in for "not starting".

Display 1: Test mode works, fixed by replacing TPS65983.

Display 2: Test mode works, replacing TPS65983 has not fixed it.

Display 3: Test mode does not work, fuse "F100" faulty, not fixed yet (as of Jan 30, 2023, currently no updates).

Display 2 Update (2024-01-23): Ended up replacing the entire motherboard, display now works normally. The motherboards seem hard to come by.

@@ Line 12: / Line 12: @@
 ==Device pictures==
 <gallery showthumbnails="1">
-File:Example device pictures.jpg
+File:300px-Model.png|Display model
 </gallery>
@@ Line 26: / Line 26: @@
 ==More Information/External Sources==
-You can manually link to external sources for additional information that might not fit here but are useful such as BIOS image dumps, firmware, etc!
+This model ''seems'' to have a prone-to-dying '''Texas Instruments USB-C PD + Thunderbolt multiplexer controller "TPS65983"''' as ive seen two (suspecting 3) models with it being the cause of the display not working. Issue can stem from other places as well, like power supply (fuses etc).
+=== How to use test mode: ===
+<gallery>
+File:225px-Testmode.png|'''Location of the button, make sure power is plugged in while testing. 1. power plug 2. test mode button'''
+File:225px-Testmode2.png|'''What the display should show if test mode works'''
+</gallery>
+=== External references and other people having issues: ===
+People complaining about loose main port: https://maker.pro/forums/threads/lg-ultrafine-27md5ka-b-provides-power-to-laptop-but-does-not-get-detected-by-computer-no-video.292861/
+Cable issues: https://discussions.apple.com/thread/252555535
+Francis (fronke_ on discord): These are my own observations, but a quick google shows others having similar issues.
+I have had 3 identical models in for "not starting".
+Display 1: Test mode works, fixed by replacing TPS65983.
+Display 2: Test mode works, replacing TPS65983 has not fixed it.
+Display 3: Test mode does not work, fuse "F100" faulty, not fixed yet (as of Jan 30, 2023, currently no updates).
+'''Display 2''' '''Update''' (2024-01-23): Ended up replacing the entire motherboard, display now works normally. The motherboards seem hard to come by.