The screen backlight not working 12 hours after a repair.
I'm a repair man for 3 years now and I repair phone every day for the past 3 years and I have never seen this before.
I have replaced iPhone 6S screen for a costumer of mine and 12 hours later she came back claiming the screen isn't working. looking at the device it looks like the backlight is not working in addition looking closely on the board I didn't see anything suspicious that could have gone wrong during this repair.
I have tried 2 other screens + her original apple screen and the problem is still there so I know that there is something wrong with the board that I cused it.
Any of you know what I did wrong in this repair so I could fix it?
Could it be a backlight IC? if so can any of you show me where it's located? I tried to look on-line for this and I didn't find anything...
Phone was turned off battery was not disconnected.
Is this a good question?