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Powers up, then shuts down

Hi there guys

I have here an iPhone 5S that does something rather strange. I have recently refurbed the whole phone with new components, inc battery and screen.

The phone powers up, shows the Apple symbol for about 2 seconds then the screen goes blank, however you are able to see the lit up backlight. It stays on for about 15 seconds then shuts down, any ideas of what it could be?

Regards

Fonebitz

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Issue was it just need to be restored through DFU Mode

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Try resetting your screen cables connectors and do not have the shield cover for the screen connectors and see if it reboots.

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Done all the obvious, but still nothing

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Are you 100% sure all the screws are in the proper holes on the lcd/digitizer bracket? If one of the slightly longer screws is put in the lower right hand screw hole, you could possibly damage your board or put pressure on the board until it behaves the way you are explaining. I have seen this happen personally. I would remove the screws and that bracket. Then Id test it out.

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I powered on the phone without the Connector bracket to test it and still the same, I also did it with the bracket and correct screws (checked 3 times) and no change

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Do you still have the old battery? I have seen bad batteries (even new) cause iPhones to act crazy. Its worth a shot.

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