iPhone 5 screen acting erratic after screen replacement

I have seen this question asked a few times and a few answers offered to fix the problem but i haven't seen a confirmed fix. I bought a screen off ebay (£20), yes probably low quality but i have ordered from them before to fix other iPhones and i haven't had this problem. If i'm trying to think of things i've done wrong, i didn't clean the digitiser back plate when reinstalling, possibly leaving fingerprints on it. I also didn't cover the black tab, next to the digitiser ribbon, with any electrical insulation tape, as i have seen something about a grounding issue? I have done a settings reset without confronting these issues and the problem still persists. If these issues i have described aren't known to fix the issue, i will probably put it down to a faulty part and try and have it replaced.

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