Chosen Solution
I dropped my phone and NOT ONLY vertical ‘ghost’ lines appeared : I was going to order a new screen + digitizer, however I noticed something else. After a minute of use or so, the screen starts to get eaten away by gray-ish horizontal lines (imgur video). This happens more frequently everytime ( 1.30 minute, then 1 minute, then every 30 seconds.) I could not tell if my iPhone is overheating because I can’t stress it enough (touchpad unresponsive for some areas). If I had to guess, I would lean towards defective hardware.
I don’t think that is a software issue but you can try this trick to be sure at 99%, record a video using the iOS screen recording, then watch the video on another device, if you still seeing gray lines then it’s a software issue otherwise it’s a hardware one.
Tried it, and the lines are not being recorded (brilliant idea btw, haven’t thought of that). Could my problem come from something else than the screen ? Or is there a way to know if this is the screen in particular ? I already tried to deconnect / reconnect, check connections on the 4 “pins” but nothing changed.
