I just changed the display assembly on FPU1 after dropping it about 10 m.
After dropping it, the touchscreen worked ok except for the lower left hand corner.
I ordered the new display unit and installed it this afternoon, and now the middle (and lower left hand) of the touchscreen doesn’t work. On the touchsreen test (✏ How to test your touchscreen for abberant behaviour (is it a hardware or software failure?)), it shows a black square in the middle. Occasionally, I can touch something in the “dead zone” and it registers, but it’s random (and rare).
I’ve dissasembled and put it back together 5 times now, and no luck -except for about 30 second when it worked properly, then it stopped again.
I figure something is misaligned (or I was very unluck to get a faulty display unit).
Thanks for the help!