Just got an ipaq 5XX0 series touchscreen from FixYourPDA and it is inverted (vertically). I checked and the leads that goes up and down the screen are inverted.

I made it work doing a mod in the Ribon of the touchscreen, inverting what was wrong, worked fine.

Seller said that in ipaqs the part does work, so I guess the I paq has something on the Software part that can accept both ways. But not the prontos, the matrix has to be in the correct sequence. Or.... this part is from a model that uses the screen upsidedown.