iPhone charging but battery percent doesn't increase?

I work at a repair shop. lately i did a screen change on an iphone 5s. Now this same phone is having problems charging.

I don't mean:

-the lightning symbol doesn't come on (it does every time the cable gets plugged in)

- that the cable is not recognised as an accessory (I have received no such message and have tried multiple cables)

- there is NO resetting or looping of the phone (it keeps working in an entirely normal way until the battery runs flat)

-there is no overheating

The percentage number just won't go up!

I have a current-reader and can see the current is not going through. I have found a workaround that seems to jump the battery into life, which involves opening the screen out of its housing, then once in a while when i plug the phone in and leave it for a while the phone starts to get a normal charge, but that's hardly a long-term fix. I have also tried to turn off the 4g network and it makes no noticeable difference.

so what is it? battery? dock connector? the screen? signs seem to be pointing to the screen but that just baffles me more.

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