crwdns2934241:0crwdne2934241:0 Alisha C
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This sounds like you are on the right track. It sounds weird, but in my recollection, it's normal for the screen to totally freak out without a touch screen connected. I think that started in the iPad 5 or 6? But it's possible the digitizer was damaged during reassembly, or even just that a cable is pinched.
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open