Interesting, however some things are not clear to me:
1. What was the initial problem with the USB port?
2. The touchscreen actually have two halves and two connectors, one on top and one on the bottom of the device.
What could be the relation between the USB port with the top touchscreen connector?
If your dead zone where on the bottom then I would understand due to close proximity or something. But the one on top?
The other day I went in and reseated the top connector but skipped the bottom one since my dead zone is located on the top part, but according to your experience it seems like the bottom connector has something to do with the top of the touchscreen also.
I'll try to reseat the bottom connector and see if that helps.
Thanks for sharing your experience.
Will post once I do that.
Cheers