820-4924 graphic issues?

[Thomas]

I'm not sure where to start with this one. No liquid damage, and it is very clean.

The issue is when it boots to OS the screen gets distorted but shows fine during boot up. If I plug in an external monitor the external monitor displays fine and also makes the internal display fine. Once the external monitor is disconnected the issue comes back on the internal LCD. I checked the thunderbolts ports and they are very clean. I also tested the board in a perfect working MacBook and the problem persists. Is this a CPU issue?

I made a video to show the problem.

https://drive.google.com/file/d/1voSTjVO6Z2y2OGFJNzVoLTWf84gINCgB/view?usp=sharing

Any input is greatly appreciated.

-Thomas

 

[2informaticos]

Try known good compatible LCD assembly.
Could be some communication issue between CPU and LCD panel.

 

[Gurmon]

This is mostly fixed with a replacement lcd panel. With the price of replacement panels these days it renders repair virtually uneconomical.