New Display has no function

Hello everyone,

i have problem since today after i repaired my steam deck. The old display should be replaced with the 512GB variant and I ordered a new one (i.e. the original part) from ifixit.

Unfortunately, after I repaired the Steam Deck, the display remained dark. Of course, I did some research on the internet and tried everything: Efiboot, Restoreboot and simply charging etc.

Unfortunately the display didn't work.

However, I noticed that the backlighting of the display seemed to work and the fan was running.

So I connected the deck to my monitor etc. and lo and behold it boots up normally and the monitor shows an image. I quickly tried all the buttons etc., these also work without any problems.

I therefore assume that something on the display is defective, I have exchanged the display cable again, no success.

So the old display is connected again, this now unfortunately also shows the same error and refuses to function.

What do you think is the problem?

Reconnecting the cables of the display and the motherboard several times didn't help either. Can you possibly help me?

Thanks :)

greeting

Felix