Hi Mleo,
I have problems understanding what you write too...
Just kidding. It's OK, English isn't my native language also, but I think we will manage it somehow...
As I wrote in my previous post, we changed screens and his phone works perfectly with mine screen, so proximity sensor on his motherboard is OK. It's some problem with his replacement screen (size of holes for sensor, or this somewhat different color on this part of screen).
We have yesterday tried this solution from video many times, for sure 10 times, and it didn't work. So I'm somewhat skeptical how that for someone it works and for us it doesn't...
I suspect that this blue color on part of the screen where sensor is located causes our problems. Can someone confirm/verify what color this part should be: violet or blue? Perhaps I can in some days disassemble his and mine screen and post photos here.