iPhone 6 flickering color lines on the screen and heating motherboard

I’ve posted another topic for water damaged phone here, and i removed the cause of the issue, so it was solved.

The home button connector was oxidized i cleaned it up and it was fine, the phone was working after that, the board was all clean.

I recharged the phone with QC anker adapter, because i don’t have the original one. (Maybe a PMU gone bad because of that?)

On the other day when i turned the phone on, the display slowly began to smolder like candle and then turn off, interesting is that the backlight was still working.

I tried different LCD from another iPhone and it gave me the same problem, but now the screen was flickering with random colored lines and it goes off after a minute.

The CPU is getting very hot, and the elements around it.

Now the screen i tested has backlight flickering problem, before i placed it on the bad board it was okay.