Screen replacement not working.
I have replaced plenty of iphone screens and I am stuck.
I have a iphone 4s front screen to replace and at this point I have tried 4 (new) screens but all stay black screen but as soon as I put the old screen in, it fires up straight away, I have even taken other broken screens and they work too.
I use a tester ribbon cable so I don't need to take the phone apart, which I thought that could be the problem at first, until I tested the other broken screens which work..
all 4 of the new screens have been from different suppliers and doubt I would hit 4 dud screens in a row..
would the new screens not work as the phone isn't on ios7??? (had this problem with the 3GS once as the new screen was only compatible with a newer firmware..