Turns off when display is put to place

I have just replaced the battery on my iPad Mini 4 LTE.

I tried to start it up with all cables connected before I put the display in place. It started up and login screen showed up.

When putting the display in place and pressing it down it shut down and will not start. Only apple logo flashing. Unable to do hard reset.

Opened it up again and I can start it up as long as the display is not put in place. Slowly putting it down everything works until I finaly drops it in place - iPad turns off and I need to open it again. Does not seem to be cable damage. I can wiggle them without iPad turning off.

Are there any “switches” or similar that may be responsible for this?