Chosen Solution
I have replaced many digitizers for many iPads. From second generations on to airs to minis, that being said I can say that it is not my first rodeo. My problem is with the iPad Air 1. When I replace the digitizer the “a” works only on the landscape keyboard if you press with your thumb on the screen and finger behind the device. It is only the “a” in landscape mode not portrait, I have tested for dead spots by moving icons and there is none. I have tried other digitizers from different companies with the same results. The “a” worked before digitizer replacement. I am at a loss to get a remedy for the problem, any help would be greatly appreciated. Thanks.
If you have tried other digitizers, then the issue will be upstream. Check the connectors (maybe some more glass :>) and look for debris or damaged pins. If that looks good, then you could probe the connector to see if the readings match a known-good device (or a reference source like ZXW). Eventually, you may have to move towards the touch circuit itself, which is covered by a shield IIRC.
