Touchscreen doesn't work

Spinbot
Hi all,
I have a number of boards which are working well, but I have two old 64mb
ones that won't work with a touchscreen anymore.  I have tried multiple
screens (both N35 and T35) but they all exhibit the same problem.
If I plug in a USB mouse, it moves the cursor, but it always jumps back to
the middle bottom of the screen.  It's like the screen is being pressed
there, but it's not.
Any ideas?

Andreas Watterott
Have you checked the LCD connector?
Maybe you can also try to read the analog inputs (AIN4-AIN7) from the touch
panel and check the values?

Regards,
Andreas