Does not seem to charge, but does not power off?

Hello!

I've got an Ipad air, and I needed to replace the charging port, and the screen aswell.

Now the thing is, after that, everything works fine: It connects to the PC, speakers, headphone jack, all the buttons, WiFi etc. Except for charging. It is just stuck on 3-4%. Even though I charged it for about an hour. Yet it does not quickly turn off, even though an Ipad would with that percentage right?

I do not have the screen attached yet, so I can still easily reach the logic board. Do you guys have any clue what the problem might be? And even better, maybe a way I could fix the issue?

Thanks in advance,

Stijn Nijhuis