Got iphone 7 from customer with battery draining fast, so I changed U2 (U4001) The phone stopped charging. I tried changing several IC's from different suppliers, with some it failed to even start. After trying some of my collegues to repair it they damaged one of the ic's Pin and now after placing new IC the phone charges when off. And when Turned on it shows only PHONE CHARGED on the screen when you connect cable, and it disappears immediately after. Strangely phone is recognised by Itunes, and i was able to backup the phone.
Can someone suggest me what to do.
