820-2915-B, GPU Replaced but red screen in the background

[2informaticos]

Correct background on iGPU?

What about external video?
It is always driven by AMD GPU.

 

[yobad]

It had always red screen, iGPU and AMD
I repaired it, I resoldered the lcd connector pins with a fresh solder.
The red screen was appearing suddenly, even on booting screen.
I didn't try in on extra screen

 

[2informaticos]

Redish background on both iGPU and AMD GPU pointed to such issue as you've found...