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Just replaced the entire screen and when I turn it on it appears the backlight isn't working, so what could have caused this problem? I have tried a hard reset and restore but those haven't made any difference.
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Put the phone in DFU mode and then do the software update. Warning: it would clear everything that you may have on the phone prior to update.
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Have you tried to plug in the old screen see if it works?
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the old screen was cracked and didn't show anything, that's why I replaced it (sorry should have mentioned that)
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also to add: sprayed the iphone with an air duster on its contacts and the backlight seems to be working! I can't get bypass the passcode (bought it 2nd hand) so I can't restore it or change brightness settings
by Patrick Lee