Black-ish screen after lcd change

Hi!

I just changed the screen of an Sony Xperia Z5 Compact.

I bought the screen on ebay.

When the screen was changed, the phone startet up an vibrates as it should, but the screen is black. It's not totaly black, because it sends out a super dim light, so it gets a bit brighter, but still its about just black.

I tried to use another moatherboard i bought some time ago, but that did not work either.

So I think it is the screen. But the new screen does not look damaged, and the cabel dose not look damaged either.

I also think the touch works fine, cause i can manage to click buttons to make the phone vibrate, but i don't see what I am doing.

Has anyone had a similar problem? I bought another screen, but if you know something else it could be, then i'm happy to hear it!:)

Thanks!