Droped my Fairphone 3 and the screen tourned colored and fuzzy. This is most likely a contact probelm between display module and main board.
I removed the display modul. then rebuilt the phone. after reassembly the display worked but the touch screen didn’t. I repeated the process of disassembly and assembly. This time cleaning the connector with a paper cloth first. also, tighten the screws near the connector first.!
Phone is now working again.