Ipad does not charge after a screen replacement

I did a screen replacement for a client and the part used are platinum rated. I followed the guide and I kept track of every screw and connector.

The device work flawlessly except from the fact that it does not charge anymore. It says sometime that it is charging, but it does not if you start analizing battery usage and a couple of minute after it realize that it doesn’t truly charge and start displaying the ‘‘none charging state’’ on the top right.

I don’t know what to do nor how to solve that problem.