Hi Richie,
I had this problem a few times now.
The best way to deal this problem is to try your digitizer without completely closing your iPad.
For example, try it horizontaly. Is it working fine? If no, then is the parts or the motherboard.
If its working fine but start having trouble as you install it then it may be the parts or the way you handle the flex cable.
Try to see from which point does it start to jump around. Usually, you'll be able to figure out if its the digizer that make a metal to metal contact somewhere or if its the flex cable that didnt like his day.
I had a pretty much even situation between bad digitizer, miss hsndling the flex cable and none covered metal parts.
I hope that it will help you.
Max One
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