Backlight issue possibly motherboard
OK i now its not the screens as i have tried several good screens which all work great on other iPhone 5's which i have since fitted onto customers iPhones no one has come back with any issues.
So it has to be something else i have reset the iPhone back to factory settings & had the battery off for a few weeks to hopefully reset it but no joy there.
This was my personal iPhone & its as if it knew it was being replaced as this happened a couple of days before my upgrade which was back in November last year.
I have never had to do any work on this iPhone so its always had the original screen on it original battery ETC in fact i have never had to open it up until this happened i thought it was going to be quite a simple backlight repair.
Any ideas or suggestions greatly appreciated.