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Repair information, troubleshooting tips, and guides for the sixth iteration of Apple iPhone, announced on September 12, 2012. Model: A1428, A1429

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apple logo loop ...

my iphone doesn't charge when plugged on a wall charger nor with a usb cable, all it does is the apple logo flashes on and off every 3 seconds, tried replacing battery, DFU, recovery mode, tiny umbrella, changed the charger but nothing worked out. I also changed the charging port but the apple still appears. I have another iPhone 5 that functions well so I took the logic board out and installed it to the other phone, turned it on and the apple logo pops up again and flashes on and off... what else could be changed??!! logic board, LCD, battery and a charging port! please I need help, I cant sleep

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Seems to be a common problem I suspect prying damage on the motherboard did u pry on the motherboard side at all when taking battery out

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but I tried a spare function motherboard that I had and still didnt work

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Have you tryed the good battery out of the other iPhone 5 along with the good motherboard

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Probably the battery.

charge your new battery in the known good iPhone 5 with the known good logic board. Switch the 'bad' board into this phone and see if it works. if no--pry damage if yes--bad 'new' battery.

jessa

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The four screws that hold the metal cover over the group of plugs from the touch screen digitizer must be returned to their original positions or "fatal" damage will occur in the holes @ 4 o'clock and 7 o'clock (lower left and right phone on its back charging port towards you). If you look down the holes there are 5 or 6 traces that run directly underneath the screw. The screws are different in length by just a hair, but it's enough sever the traces running directly underneath. When I did it, the phone would still turn on, but was stuck in loop similar to what you're describing. use a scope and check both of those locations. if you dont have a microscope, a pair of binoculars flipped around will work.

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try "reiboot" also. Great app for breaking the loop.

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