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| LG Ultrafine 5k 27MD5KA-B Display completely unresponsive repair | |
|---|---|
| Device | LG Ultrafine 5k 27MD5KA-B |
| Affects part(s) | Logic Board |
| Needs equipment | |
| Difficulty | ◉◉◉◌ Hard |
| Type | Soldering |
Problem description
Display is 100% unresponsive, does not charge connected device.
Symptoms
- Display is 100% unresponsive.
- Does not charge connected device.
- Test mode works (see LG Ultrafine 5k 27MD5KA-B and scroll down to "How to use test mode".)
Solution
- Test different thunderbolt 3 cables for connecting the device to the display's main thunderbolt port. The cable that came with the monitor is the best candidate.
- Test unplugging device for 10 minutes from power then plug it back in.
- Disassemble the monitor and unscrew the main board and inspect the TPS65983BA chip located on the same side as the USB-C ports, if there are any visible indications of damage a replacement might be necessary. The chip can be replaced with an (almost) identical TPS65983BA (TPS65983BAZBHR) Datasheet, I bought them on Mouser. It is the same BGA layout as CD3215 chips commonly found in more modern MacBook, seemingly called both "BGA MicroStar Junior (96)" and "NFBGA (96)". The chips should come pre-balled (mine from Mouser did) so it's a quite easy repair if you have worked with BGA before. It is not sure if the replacement chip will exhibit the same behavior after some time, this has not been documented.