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Repair information and guides for the iPhone 6 that was released on September 19, 2014. Model Numbers: A1549, A1586, and A1589

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Partial Boot Loop/Won't Start Up

I have an iPhone 6 that was dropped. It shut off after the drop and now when I attempt to turn it on it shows the Apple logo for about 5-10 seconds then shuts off. It doesn't continue attempting a restart like a boot loop typically would. I've attempted a new display, a new battery, disconnecting and a new proximity/front cam flex, disconnecting and a new charge port/headphone jack flex all with no change. I've also tried a soft reset, entering DFU mode, and connecting to iTunes for a hard reset but iTunes does not recognize the device (not that it says it doesn't recognize it but it won't show up as being connected). I don't see any damage to the board either. Anything else I can do?

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Did you use a geniune apple cable when attempting to connect to your computer.?

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Nothing but genuine cables

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You have tried pretty much everything we would normally recommend. At his point, you have to start suspecting a problem on the logic board. Even though it looks okay, any failure will be microscopic and most likely even underneath the IC's. A hard impact can damage the delicate solder joints underneath the IC's.

The last thing to try is to download 3uTools and try to flash the firmware.

Failing that, you should consider having your phone looked at by a repair shop that does micro-soldering repairs.

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