Chosen Solution
I just got my IPhone X screen replaced after I cracked it, but did not realise that the top part of the screen is unresponsive. The rest of the screen is working fine, but I feel like it has to do with something very simple. Anyone know?
I would perform a soft reset - tap volume up, tap volume down, then long press power button until you see the apple symbol, if that does not work, i would open the device, make sure the connectors are seated properly. If they are, It is in my opinion you have a defective display and it would require replacement. If your replacement display has the same issues, there are a number of iPhone X models that do have touch screen issues but typically you will see a green line running vertically along the display if that’s the case. My guess is defective display but i would try those troubleshooting steps first.
