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| LG Ultrafine 5k 27MD5KA-B | |
|---|---|
| Manufacturer | LG |
| Code name | |
| Release date | 2017-04-20 |
| Device type | Television/Monitor |
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| 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 |
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Device pictures
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Display model
PCB pictures
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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:
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Location of the button, make sure power is plugged in while testing. 1. power plug 2. test mode button
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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.