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Released on September 19, 2014, this 5.5" screen iPhone is the larger version of the iPhone 6.

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iPhone 6 Plus boots to apple logo then disappears leaving backlight on

I recently bought a used iPhone 6 + online. Before buying I checked to make sure it was not iCloud locked, it wasn't water damaged. The phone wasn't blacklisted, and there wasn't even a scratch anywhere. It appeared to be in percent condition. The only thing that was wrong with it was the phone not booting up.

I went ahead a purchased it, and it came. I later hooked it up to my computer and first tried restoring it. I held down the home button and the computer registered that the phone was in recovery mode. It asked me if i wanted to restore, or update. I first tried to restore. So far things seemed to be working well until iCloud finished the first step, and began restoring the phone.

I heard the computer make that noise that meant it had lost connection with my device. The iPhone that had been unresponsive with just the backlight showing, now booted up back up to the apple logo, and froze until I forced restart it.

I also tried to update it. That didn't work either.

Using a cellphone screwdriver kit, I carefully took the screen off and examined everything.

I tried unplugging various things (the screen, the battery,) and tried again to restore or update on iTunes. with them detached.

I have watched many videos, and tried the different ways you can possibly fix this situation:

1) by opening the phone in recovery mode manually by holding the volume button,

2) trying to boot in DFU mode,

3) force restarting,

It is possible it could be some internal component that is damaged. But I have no idea where to look. I've heard replacing the battery can help, the wireless antenna, the proximity sensor, even a chip!

Anyway, I would be very grateful if someone can help me troubleshoot this situation, because I would hate to have to spend a lot of money buying every single thing in there to try to fix it, when it might be something simple.

Thanks.

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try DFU restoring with nothing but a known good battery and charge port, you may have to plug in the home and power button at first to get it into dfu mode.

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I have already tried to get the iPhone into DFU mode many times, and for some reason iTunes still won't restore or update. The phone crashes before the format even starts.

I haven't tested the battery, and at the moment, I don't have another to test it with. The phone appears to boot to the Apple logo. About five seconds later it switches to just the backlight so the screen looks like it off but there is a very dim light in the background. Thirty seconds later, it completely goes black.

I have tried many Apple certified wall chargers and cords, and at one point, I even saw the red low battery logo on the screen for a few seconds.

The issues:

1) the phone crashes before it can update or restore

2) the phone won't boot past Apple logo,

3) for thirty seconds it just stays with nothing except the backlight on,

4) even in DFU or restore mode, it still crashes.

I am pretty sure the phone hasn't been jailbroken, but I've heard if it was ever jailbroken, sometimes phones will react the way mine is.

Thanks.

por

Phone is auto booting into DFU mode which gets stuck there, this is definitely a hardware issue, could be board level like U2 Tristar charging IC, but better to try replaceable parts suggested by gigabit first.

Mobile phone repair shops / and people that do micro-soldering can help you with that.

por

Thanks for the feedback I really really appreciate it.

If the issue could be the Tristar IC chip, is there anyway to test to see if it is defective with a multimeter?

Also, from what I have read, the Tristar IC chip seems to be for the charging of the phone. My phone seems to charge okay; at least it turns on when I connect a lightning cable to it.

Does the chip have something to do with the booting of the phone?

I'm just asking because I'm not entirely sure what the chip does beside regulate the current of the charge or something like that...

If the chip is defective, could that be causing my phone not to boot up past apple logo, or restore or update on iTunes? That is my main problem.

Thanks.

por

The Tristar is not just a charging chip, it controls usb communication and switching between battery and AC (power from the wall charger / charging cable).

A faulty tristar (not completely dead one) can cause issues like this.

Anyway with an issue like this after exhausting the other troubleshooting steps mentioned above, it would be a board level issue.

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So, you are pretty sure it is the Tristar IC chip that is defective?

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