I swapped screens between two good and working XS 256, to my surprise screen 1 works on both XSs, while screen 2 only on one XS.
I have reseated the connector several time with no luck: both screens work on iPhone A, both iPhones work with screen 1, but iPhone B only works with screen 2.
So I assume that both screens are ok and both logics too. But that combination is not.
How come?
I cleaned the contacts and repeated the swap several time.
The reason of this swap is that one screen is cracked (incidentally it’s the screen that works on both phones) and I want to avoid the hassle of reinstalling and configuring everything (emails, bank accounts and several one time passwords etc…).