Chosen Solution
I have an iPhone XS Max which has a super strange image issue. The phone has been opened, and I found that image does not work when an iPhone XS Max screen is used on it. However, if an iPhone X screen is used on it, image works. I also noticed image is super sensitive when the X screen is working with it, meaning if the screen is moved slightly it starts glitching and not working. Does anyone know what this problem may be?
What type of screens are you using OLED or LCD? You need to try it with a known good OLED screen. The LCD screens have a different architecture and can cause trouble due to the backlight circuit running directly off VDD_MAIN.
