Stripes on the screen, that dissapear sometimes.
There are mostly white but other coloured stripes as well on the screen, that come and go based on what's displayed.
The phone hasn't taken any major damage recently nor suffered a serious fall. The stripes appeard out of nowhere and I don't think the LCD is faulty/damaged.
P.S. It's my friends phone, that I'm trying to fix, not mine. I'm not a k-pop fan.