iPhone 7 Plus won’t turn on after battery replacement
Plug it in and hold down volume up/down button(I don't remember) and lock button. Keep holding till the Apple logo shows. If Apple logo doesn't show, plug it in and let it stay for a while. If still doesn't boot, go to the repair shop where you got the battery replaced
well it switched on before and then it didn’t come back on when I unplugged the screen as it was fuzzy
Apple has changed the way you change them to stop people putting non apple parts in, it’s a software thing.
apple changed the iOS software to stop people changing iPhone screens and other components, you need to know what to keep/how to set it up if you want to put a new one in.
so the only thing you can do is take it to Apple to have it fixed or get your old screen back and battery and have someone that knows what they are doing fix it.
I know what I’m doing and not changing the screen yet so if I can’t get the battery to work I’ll just put my old one in
ok, I know there’s a device now you need to replace the battery’s.
And a part in the screen I believe to keep it working.
The above comment is referring to Apple locked the Chip they put on the screen camera and charging port to the specific logic board and only repair shops have the tech because it’s very specialist equipment.
I don’t think it applies to batteries though
actually yes for the batteries you need a special device to copy information from the old to the new it has something where it knows as well.