My FP5 screen has a flicker that I cannot seem to fix. It first appeared out of the blue a few weeks ago (I picked up the phone in the morning with the issue after it had been fine the night before).
I have disassembled it twice, checked connectors etc., which usually did the trick with my FP3, but the issue persists.
Check by pressing on the sides if your display is fully attached to the phone.
Another idea dismantle the display and reattach. Maybe a connector is a bit loose.
