I have 2x 7inch touchscreens laying here. (Original raspberry touchscreens) I always had one connected to a raspberry. The other one was backup. After I connected the backup one to the raspberry, my SD card went corrupt.
Now I tried everything to get one of the two touchscreens working with a fresh install of raspbian. Both don't work. Tried updating raspbian etc. Nothing has worked. The DSI boards don't have a light so I can't see if they are broken.
The raspberry does not recognize them with:
dmesg | grep -i ft5406
So I think it might be the touchscreens that are broken.
Is there anyway to trouble shoot this?