Hi! In 2017 or so I bought a 7" official RPi touch screen, and it has served me well, except that touch stopped working. Note that I use
config.txt – for what I use it for, I prefer the display to lie more horizontal. So when I speak of “the bottom pixel row”, I really mean the bottom row as the manufacturer of the display intended it. For those who use
lcd_rotate=2, please think “top” instead of “bottom”, “left” instead of “right”, and so on.
What happens on my touch display is that touch only works in the bottom-most row of pixels. Anywhere else on the screen, my touching, tapping, holding is ignored; but in that bottom-most row, it works fine. As if scanning the Y coordinates had stopped working, but the scan along the X-axis still worked fine.
I re-seated the small FPC connector on the display controller board but did not dismount the board from the screen, as I understand the wide FPC connector on its back to be related to display only, not touch detection.
What else should I do before declaring the display (or at least its touch function) unsalvageable?
Grateful for any and all advice,