Ok, I just read the Whole msg: you've reflowed around the ribbon cable.
Did you do a continuity check from the digitizer input pins on the uP to the solder pads?
It's not a software issue. Either the input pins to the uP are bad or you have an open trace (via?) To the display connector.
If your ohmmeter has less than 3v at the leads, try measuring the resistance during touch, at the input pins to the uP with the VNA OFF.
If I remember correctly, there is a forum post with firmware to test the touchscreen.
