New FP2 Display remains black


I had to change my display on FP2 (the old one is broken).
Additionally I have added thw two new camera modules.

However, when I want to activate the phone the display remains black.
The charging LED is working, also sometimes the vibra when pressing the power button or volume down.

If I connect the old display then at least it has power supply (though there is no clear graphic as it is broken). It seems like the new display has no power.
Did I forget something?

Or is the new display also broken?

Thank you,

2 posts were merged into an existing topic: New Display is not working