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Old 04-14-2015, 17:35   #1 (permalink)
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Join Date: Oct 2011
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Iphone 4, logo 1 sec then off

Hello all

I was testing a new screen for my iPhone 4, and after reinserting the battery the screen flashed with Apple logo for 1 sec and then the phone turned off. It is dead untill I remove battery and then it does the same.

Without battery and into the computer port, the screen does the same.

I put the motherboard into another iPhone, but the problem is the same, so I guess the problem is with the board/software.

I can put the phone into DFU mode and iTunes finds it but without serial and screen only show a logo shortly and then turns off. When trying to restore I get an error 21.

Please help.
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