Chosen Solution
I replaced the digitizer on my iPad mini 2 but I’m having a problem. There is a strip, approximately 1” across the top, that is not responding to touch. The screen is fine and everything else is working but nothing happens when I touch within this strip. Is there a problem with the digitizer or did I do something wrong?
Most likely it is a faulty digitizer (probably a weak solder joint on the flex). I would try re-seating the digitizer connector to the motherboard, just to make sure it’s not loose. If you still have issues, get a replacement digitizer. If a replacement digitizer has the same problem, you should look at the digitizer socket on the board.