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iPhone 6 turned itself off and won't turn on again or charge!

I was just playing music on the phone while leaving it on the table, I wasn’t even touching it. But the music just stopped all of a sudden and there’s even a faint *pop* sound (seems to be from the speaker, not some component exploding) when it happened. Now the phone won’t respond in any way that I’ve tried including plugging it to a computer or pressing the power+home button for 20seconds. I am quite sure that the battery was over 80% when I started using the phone to play music.

Is this phone still repairable or is it a complete brick now?

Note: I have upgraded (just last week) to the latest iOS 12.1.2 hoping that it will fix the previous issue that I had with the touch screen not responding sometimes. Apparently it didn’t help at all, but I”m wondering if the update could have screwed the phone to the state it is in now?

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Has this phone ever been repaired? If not, there are two highly likely solutions.

  1. Replace the battery. The iPhone 6 is about 4 to 5 years old. Even if the battery has been replaced before, its probably old enough to need replacing again.
  2. The charge chip (tristar I believe) needs to be replaced. This repair is not a DIY and requires micro soldering skills.

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Thank you for the response Brian.

I've brought the phone to a "non apple-authorized" repairman and he popped in another battery to test but the phone didn't improve in anyway. However I think the battery he used wasn't an Apple original so that might have contributed to the failure, though I think it should have at least worked for a good minute. Also, the original battery in my phone wasn't showing any signs of bloating.

Could you elaborate on how a failing charge chip could have rendered the entire phone a brick? I imagine that would only cause the phone to be unable to charge. And do note that my battery was at least above 50% when it died. If that indeed is the cause of failure, could I have just replaced this component on Step 21 of the teardown? iPhone 6 Teardown

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The symptom of it dying with 50% is what made me believe the battery was the issue. The symptom of it being dead/not taking a charge made me believe it was the tristar ic. Has the phone ever seen moisture in anyway?

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Could you identify which board does the tristar IC reside on so I can maybe find a replacement? Like you said the i6 has lived some years and I'm sure it's been in contact with water on some occasions. It was on the table pretty close to an air humidifier when it died (>_<) but I believe there was no direct contact with water.

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Unfortunately, I have little knowledge when it comes to board level issues. I just know their behaviors.

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From the description you gave it sounds like something failed on the board and shorted.

It could be a number of things on an iPhone 6 board that “spontaneously” fail and brick the phone.

It could be Tristar itself of course, but in this case I lean towards a failed and shorted cap that “grounded” a major power rail. Think of it a bit like a main water supply pipe bursting and the water draining out instead of reaching the intended components.


I recommend that you have it taken (or mailed in) to be examined by a third party iPhone technician to determine the exact cause and possible solutions. For someone with enough experience, these are usually pretty straightforward and you should be able to regain both your iPhone fully functional as well as your data. There are cases where the storage chip (the NAND) that holds your data may have malfunctioned and died; in which case you can fix it but not recover your data. It is less common and I would bet on other things in your specific case.


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Thank you Rany.

Do you think a situation like this can be observed without specialized tools? I don't intend to be spending (anyone that can be considered of enough experience sounds like they'll cost quite a bit) on repairing a pretty old phone though I do hope to recover the data off it.

I'm fairly experienced in DIY repairs so if you could provide some instruction I might just be able to get it working again. If repairs are not possible, do you know if I could just transplant the NAND chip over to a surrogate phone to get data off it?

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"I just need the data" is what makes all the difference. If data is important, don't try and DIY. If data is not important, you can whip out a DMM and start measuring power rails to see which one is shorted. You'll also need board view, schematics, magnifying glass, and a hot air gun, tweezers, and a set of screw drivers.

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And no you cannot just transplant the NAND. You need to transplant as well the APU and eeprom. Simply put, it's because the data is encrypted and the key is inside the APU. And the APU needs the eeprom to boot.

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