Screen is dead. Phone is on
I got two iPhone 6 and one iPhone 6 plus in for a repair.
The problem is that the screen is dead but the phone is still on. The two iPhone 6 have been repaired before (screen replacement) but the iPhone 6 plus has not been repaired.
I have tried new screens, but nothing. Disconnected the battery, and hold the power button, reattached battery and screen, still nothing. But phone is on..
What might be the problem and is it fixable?