ran over and now bootloping

Question

iPhone 6s Plus

2015년 9월 25일 출시. Model A1687/A1634. 수리는 이전 모델과 유사하며 스크류 드라이버 및 비집는 도구가 필요합니다. GSM 또는 CDMA / 6, 64, 또는 128GB / 은색, 금색, 스페이스 그레이 및 로즈 골드로 제공하였습니다.

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lukerockhill @mobilemedic

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Mobile Medics Ocala

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게시일: 2018년 12월 6일

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ran over and now bootloping

a customer brought in a 6s plus that was ran over by a car. they want to get it fixed to retrieve the data thats in the phone still. surprisingly the board dosent look bad and the housing wasnt even bent or anything. the issue im having is when i initially connect it to dc power it draws .01a for a second then goes to 0 and stays, until i prompt to boot. it turns on a shows the apple logo for about 3-5 seconds then cuts off again. (while it is on the boot current seems normal.) i havent tried to update or restore because i dont want to risk the data. so far all ive done is measure nand power rails and reball the nand to no avail. i also did a full visual inspection and cant find any cracked or visually damaged components. just posting to get some ideas

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Minho @refectio

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It’s a pretty risky approach to just reball the NAND without really understanding what’s wrong with the device. You could damage the chip or the logic board during the process, to the point where it becomes difficult to retrieve data.

When dealing with a dead device, spend some time to do at least some rudimentary probing. Check the main power lines and the main PMIC outputs (PPCPU/GPU, SOC, FIXED, SDRAM, NAND etc). If that looks good, then check the main BBPMU outputs.

Because the phone was crushed, it may just end up being a few bad solder balls somewhere but before applying tons of heat, try to rule out the easy stuff, like subsystem shorts.

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i checked the main power rails and did probe around a bit before just reballing the nand. i did that because i saw a dent in the back of the phone near the nand and it was tuning on just not booting up. i got it working now so all is good. ty the the input though

lukerockhill 의 2018년 12월 6일

just cba listing every point that i probed if i can even remember them all... lol

lukerockhill 의 2018년 12월 6일

also how is reballing the nand risky? its pretty straight forward. with large balls far apart and no nearby underfilled chips. the only thing on the other side of the board is the sim tray.

lukerockhill 의 2018년 12월 6일

On an iPhone logic board, underfilled parts are never really far away :>). Applying heat for anything always has risks. If you lift a pad or are not sure the chip was properly seated, then you have to rework the pad and apply heat a second time to double check.

Of course, you're skill level will have a direct correlation with success, still, it's a "best practices" point of view.

Minho 의 2018년 12월 6일

Thanks Luke!

Minho 의 2018년 12월 6일

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i checked the main power rails and did probe around a bit before just reballing the nand. i did that because i saw a dent in the back of the phone near the nand and it was tuning on just not booting up. i got it working now so all is good. ty the the input though — lukerockhill
just cba listing every point that i probed if i can even remember them all... lol — lukerockhill
also how is reballing the nand risky? its pretty straight forward. with large balls far apart and no nearby underfilled chips. the only thing on the other side of the board is the sim tray. — lukerockhill
On an iPhone logic board, underfilled parts are never really far away :>). Applying heat for anything always has risks. If you lift a pad or are not sure the chip was properly seated, then you have to rework the pad and apply heat a second time to double check.

Of course, you're skill level will have a direct correlation with success, still, it's a "best practices" point of view. — Minho

iPhone 6s Plus

ran over and now bootloping

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