820-00840 - Crashing after a while

[rvanpruissen]

* Crashes shortly after booting: black or garbled screen and no response
* Everything seems fine till then
* Logging looks normal
* Removed a small bit of liquid damage between two of the unpopulated pads for U5450, looks clean otherwise.

 

[2informaticos]

Disconnect internal LCD and test it with external monitor.
Also remove its SSD and test with USB macOS.

Check what happens starting in SMC bypass, or safe mode.