I was repairing the LCD on a Iphone 4 CDMA and unplugged the LCD connector before the battery. I hooked it back up and the screen was black. The phone was on you could see the back light and you could hear it. I tried two other screens and the same except the last one the screen was a little gray. Did I do permanent damage to the logic board? I have tried the reset and it did not work.
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The iPhone is not so vulnerable.
You can try to unplug and plug the connector of battery.
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yes like stated installed two more LCDs and none of them worked. I have see on repair videos a warning about unplugging the LCD first could cause damage want to know if this is true what damage has been done.
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Is your iPhone iOS 5 If so then you will need to update to iOS 7 and the screen will work..
New screens don't work on iOS 5
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