My screen backlight comes on instead of displaying an image (sometimes
I bought a iPhone 6s with a broken screen and I changed it with a good quality new one . I factory reset it and restored it through my computer . When I click the lock button it sometimes does display the screen properly and the touchscreen works when testing it , but when I lock it again and try to unlock it the backlight only turns on and the screen displays no image .
I have tried another two screens for the 6s which work with no issues on other 6s phone I have repaired but the same problem occurs. This has never happened to me before and I'm not sure what to do now , I hope you guys can help out here, thanks .
Is this a good question?