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iPhone4S是第五代iPhone。网络制式为GSM/CDMA ,存储容量有8GB、16GB、32GB、64GB可选,机身颜色有黑色、白色可选。维修iPhone4S是容易的,需要耐心,用到的工具有螺丝刀、撬棒等。

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backlight not working after replacing the screen?

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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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

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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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