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2014年9月19日に発売されたiPhone 6の修理情報とガイドです。モデル番号 A1549、A1586、A1589。

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iPhone 6 short on pp 1v8, shows up in itunes in recovery mode

Hi, this phone suffered a major drop. Shows no signs of life but when plugging into iTunes it says that its in recovery mode and needs to be reset, but i need the data off of it. I found a short on the pp_1v8 circuit which is located almost where the phone got hit, so it makes sense, vcc_main seems fine to me, checking pp_gpu and pp_cpu i get low diode values, but checking for ground shorts on these two lines i get no beeps on the multi meter. I dont really know how to proceed, i cant find any visible bad caps that need replacement, i would change some caps in the 1v8 circuit to see if it clears the short but im worried about the gpu and cpu power lines. Any help or recommendations?

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GPU and CPU lines will be fine as they have a very low resistance. Check the big 1V8 caps either side of the NAND these are the ones that turn into wires. I know there are a lot of caps on this line but from experience it will most likely be one of the large ones.

·         Use a pair of tweezers and slightly nudge them and see if any feel loose.

·         If you haven’t got a DCPS or thermal cam use a bit of Isopropyl alcohol on the caps while the phone is powered up.

·         When you find the short don’t worry too much about replacing the cap until you get your data off. You don’t want to subject your phone to unnecessary heat. The phone will boot fine without a few of the 1V8 caps.

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Ok, did this last night, removed two caps and short is gone, still low diode value and booting in recovery mode, cant find any other shorts, Nand gets very hot when booting (which it also did before removing caps) maybe its a faulty nand ?

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If PP1V8 is partially shorted and the NAND is getting hot you are probably right. If you are competent enough you could try removing and reballing the NAND or a much safer method would be to have a data recovery service do it for you.

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You don't think this could have anything to do with the pmic?

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I used isopropyl to see where it evaporates and the nand is where it starts to bubble I think, so I really don't know how to proceed, and don't feel confident reballing the chip either so... :(

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A repairer would remove the NAND and put it in a programmer to see if it could be read, if it could it would be reballed and put back on. If it is damaged and can’t be read then your data is history. Put it in a draw with your passcode taped to it until you work out what you want to do.

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Gianluca Gatto さん、ありがとうございました！
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