maybe somebody could help or knows a solution…
Fortunately I got one of the new replacement-screens. Today I tried to replace the old, cracked one by using the manual of ifixit. Everything run perfect, the phone started to boot like before, everything seems to work perfect. But there is no response by touching the display. I repeated everything a second time, checked every connection but still the same. I also made a test in the factory mode to exclude an unlikely software-problem.
I took a look at the ZIF-Connection-Cable which should be connected to the motherboard right form the headset-plugin. It seems that this cable makes his kink at a different position then the ZIF-cable of the old display. Could this be a problem? Could this kink, which was there since I got the screen, be the reason for a functionless touch-screen. And ist there a possibility/manual to replace the cable of the old display to the new one?
I mad a photo of the cable.
Update: Now, I replaced the old display and it works, so there is definitively no problem with the mainboard.
I am really sad, because of waiting months for this new but functionless display, would be glad if anybody could help.