Touchscreen stopped responding

[logen]

I don't use the touchscreen much, but it suddenly stopped being detected. I suspected a software issue as it broke upon doing one thing, and fixed upon undoing that thing.

However, now on a fresh flash the touch screen is still not detected. I suspect a wire or two needs to be reseated.

Before I tear the thing apart, are there any quality dissasembly/reassembly videos? Anyone else have this issue or solutions?

Mostly, I'm afraid of cracking the screen or some such while working on it. I seem to remember ED mentioning there was some risk when reseating the screen.

Thanks all!

EDIT:

Remembered this video:

 

[levi]

I think there's more risk of cracking the LCD panel when assembling a Pandora than there is when assembling a Pyra; perhaps you're remembering EDs original Pandora assembly video?

 

[logen]

It very well could be, I ended up taking it apart. It was easy, but no success in fixing touch ><.

 

[levi]

From my memory, touch comes in a different cable from a different layer of the screen, which both go into the display PCB which are then combined to become the video cable which goes through the hinge. I would recommend removing them, checking for corrosion (unlikely) or dirt of both those cables, then reseating them. There's probably a touchscreen decoder chip somewhere though I couldn't say if that's on the display board or the main board.

 

[logen]

Thanks for the ideas, but I did pull both cables on the display board. I'll probably give it a try again someday when I'm motivated to work on it.

But from what I saw, the touch screen plugs into the board, there's a push on cable that I'm not entirely sure what it does, and then the ribbon cable that goes to the main board. I tried reseating all of these to no effect.

I also reseated the ribbon cable on the main board, which may be where the problem is. That one is a bit tricky, took me a few attempts to get the screen to work after fiddling with it.

EDIT:

I believe ED said that the push on cable is the LCD, so yea, everything must combine and go through that ribbon cable.

 

[logen]

Finally got around to taking it apart again. Still no touch ><.

What should I be looking for to see if the touch screen is even somewhat noticed by Linux? I reseat all connectors and still nothing.

Short of assuming the touch screen to be dead I'm out of ideas of what to try next.