After replacing the powerbutton that had broken down, my screen started to behave strangely (non-responsive).
So I replaced the screen, but that did not help. The touch is unreliable.
So I checked the digitizer cable and re-connected it. It remains unreliable. I have to press it real hard in order for it to function a couple of minutes, than apparently it slightly disconnects again and the touch doesn't work.
Press it again, it is okay again for some time.
I am beginning to believe that my original screen was okay after all, there is something with that connection that gives the failures.
Any advise?