iPad Air 2 serious touch screen and battery problems
I have recently received an iPad Air 2 that a friend wants me to fix. When she got the iPad, brand new a couple of years back, she did not use it more than once and it was left in the box. She wanted to use the tablet again as her previous one broke.
As I was given the tablet to set up, I tried to power it on for the first time in two years. Nothing happened. I tired charging it for an hour, still nothing. But then, it miraculously came on and charged to full. Everything worked fine, until it just randomly shut off (he battery meter was still on 100%) and didn't want to come on again. Plugging it in, using different chargers, reseting it with the home/power button, nothing worked.
So she sent the iPad to a repair shop (not Apple certified as the Apple Store in our city could not do anything for her). Some way they got it to power on and charge it (they opened it up, I don't now what they did).
But when they sent it back, the touch screen did not work anymore! They told her that they need to replace the whole display now!! But she said no, and then gave the tablet back to mee to see if I can figure out what is wrong.
After I got it back, though, I found out that it still does not want to charge. The battery meter is also erratic. It stayed on 100% for two weeks (the tablet was never turned off), then when I finally decided to plug it in, it said charging 96%, the after I plugged it out again, it went back up to 100%. So naturally I restarted the iPad. Now suddenly it was on 16%!! I plugged it in once again -> 11%, plugged it out ->13% and so on.
I thought it was the software, so I did a complete restore and update with iTunes to IOS12. That did also not fix anything. I also opened the tablet up to see if the display cables for the touch screen was damaged (as the touch screen still does not work), but apart for the display cable connector cover that's missing (the repair shop did not put it back) everything looks fine. I also reseated the display cables.
I just want to know what the problem(s) might be so that I can know if I can replace the problematic parts, but I do not want to buy parts unnecessarily.
Is is possibly a faulty mother board(which may account for both problems), or is it possibly two separate problems.