Chosen Solution

Weird thing. After I slightly droped my iPad (on it’s back) I started noticing unpleasant behaviour - a vertical “strip” of digitizer periodically turns off with no impact from outside. I simply hold it and slightly touch the screen, and 1 time it works flawlessly, 1 time doesn’t at all But if I do a hard reset (home + power buttons) the issue is seemingly gone. For some time… I opened it up and reconnected the digitizer connector, but it seems to get worse Does that signal the screen is broken (visually it’s absolutely ok) or do digitizers die instantly? Can’t get whether it’s time to get a replacement or is it software/connector related. And is there a cure aside from replacement (heating it, for instance)? OS restore is unlikely to happen as I’ve got Jailbreak and plenty of tweaks I’ll not be able to reinstall (Cydia is down).

The digitizer itself could have been damaged from the impact even though there is no visible damage. I would try another digitizer/glass and see if this resolves your problem.

I got it working finally. I turned out to be not as simple! After I did a Lightning replacement some time ago I didn’t notice the right placement for a coaxial cable laying in the bottom of assembly. I stuffed it under the speakers and THAT WAS WRONG MOVE, as they lifted a bit. So when I glued the screen it had a stress on the bottom. I didn’t even notice it as it was laying flush. But after a drop something interrupted there and it touch started glitching. I suspect it needs a replacement anyway, but for now it works.

A little note (I think if we’ll find the solution it would be helpful for others so excuse my tediousness :P) To check the screen I try to type a text. It’s getting harder as a half of the screen glitches now, and what I found - quite often when the key does not print a character I HEAR THE SOUND OF THE KEY PRESSED! So it actually registers the touch. Also, sometimes touch gets a little hysteria like I use second finger somewhere. So now I suspect like it thinks like there’s a phantom touch! WTF? How to diagnose this? What could be the cause? PS. I use http://spark.attrakt.se/ for the tests. JB and tweaks are disabled