Screen won't turn on iPhone 4
Just replaced the screen of a friend's iPhone 4 because it had a crack and didn't turn on.
I installed everything, then turned the iPhone on.
=> Nothing on the screen and touch didn't work neither.
The silent switch worked (phone vibrates) and I can hear the lock sound when locking the iPhone. Once connected to iTunes the phone can be synced too, no DFU mode or whatever it can be.
Then I tried connecting another new screen, the same problem.
Other detail: when the screen is supposed to be off and I press the lock or home button it VERY shortly blinks a white color on the full screen and then nothing.
Is there a way to fix this?
Thanks in advance!
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