Dear all,
I have a wierd issue with an iPhone 5s. First it showed searching in the top left corner, I figured it out thet this was a baseband problem because of a drop. So I decided to change the logic board. After the change I tried to turn it on but it didn't work with the new logic board. Although iTunes detects the phone and says "There is a problem with this iPhone it needs to be updated or restored" After the restore the same issue happens. I tried another srcreen but still nothing. Than I put back the original logic board and the same issue happened with that, iTunes detects and says it needs to be restored but the screen is black. I tried multiple computers, mutiple charging cables, multiple LCDs and multiple batteries.
Do you have any idea what can be wrong?