touch screen is not responding. not the digitizer.
I have a 3g 8gb iphone and the touch screen is unresponsive. to check if it was the digitizer I switched the unresponsive touch screen with a working one and that one didn't work in that phone either. I switched out the logic board for a working one and the touch screen works fine. I'm assuming that leaves the logic board from the as the problem. I don't believe there's been water damage as the 2 stickers on the logic board are white. I've searched the internet for hours for similar problems and have found nothing. could the touch screen ic chip be bad? if so can it be changed out with little difficulty?
noticed your question and just want to say I had very same issue. Most people talk about digitizer issues but this has nothing to do with it.
I did the same as you (replace by another screen) and it did not work either. The phone works well and eventually it will become unresponsive. Home/Power/Volu
jut wondering if it could be on the the 3 connectors for the screen... cold soldering or something... grrrrrr