iPhone 5s Turns Off by itself

Question

iPhone 5s

苹果 iPhone 5s 于2013年9月10日公布。该设备的维修与以前的型号相似，需要螺丝刀和撬棒。可使用GSM或CDMA / 16、32或64 GB。颜色有银色、金色和太空灰。

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Anon545454 @anon545454

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发帖于: 2017年3月6日

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iPhone 5s Turns Off by itself

So I have had this iPhone 5s since it first launched, and the batt died last August. Got a battery replacement mid December.

Problems:

1. The phone would mysteriously die when not in use. In 24 hours it'll for sure turn off by itself. Over night it'll shutoff. Keeping iPhone plugged in doesn't solve the problem, it'll still shutdown.

2. When around 20% batt left phone would shutoff, when plugged in will turn on again normally.

3. Changing to another batt didn't solve the problem. I bought like 5 replacement batteries, none of them fixed the problem, tried them on my other 5s as I have about 4 of them, worked perfectly fine, no random shutdowns.

Question:

Which ic chip is most probably busted? Main power IC or the U2 chip? Or is it something else??

PS.

In diagnostic there is Panic code

@benjamen50

which one? the one @ the very right?

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Wait a second what is the kernel panic code?

由 Ben 完成的 2017年3月7日

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Ben @benjamen50

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Mtwo Perform

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Power management IC no doubt. U2 Tristar Charging IC does not cause this.

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I have an iphone 5 with the same prob, so U2 of both phones busted?

由 Anon545454 完成的 2017年3月7日

It's not U2 it's PM IC.

由 Ben 完成的 2017年3月7日

If the main power ic is busted it won't even turn on right?

由 Anon545454 完成的 2017年3月7日

No because I have a iPhone 6 with this exact same issue which causes intermittent shut down issues (Already tried another battery).

由 Ben 完成的 2017年3月7日

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I have an iphone 5 with the same prob, so U2 of both phones busted? — Anon545454
No because I have a iPhone 6 with this exact same issue which causes intermittent shut down issues (Already tried another battery). — Ben

Lettucejuice @lettucejuice 声誉积分: 199 5 · Answer 1 · 2017-03-06T09:51:43-07:00

Lettucejuice @lettucejuice

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Before you go into the motherboard troubleshooting I would suggest that you charge the battery up to 100%, open up the phone, disconnect the charging port and proximity sensor and see if it still shuts off. If the problem is gone then re-connect the parts one by one until the problem re-occurs.

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Proximity already changed as it was broken, didn't solve the problem. I will try to unplug the charging port as well, thank you, will get back to you in about 9 hours.

Previously I'd thought that unplugging the proximity oughta fix it, it didn't, so I changed it, didn't fix it as well.

由 Anon545454 完成的 2017年3月6日

So far its still on, I'll see for a few days if it'll stay on like this, usually when batt gets around 70% it'll start turning off fast.

由 Anon545454 完成的 2017年3月6日

To be sure that it doesn't happen during this activity, open up a 10 hour long YouTube video and let it run for a while

由 Lettucejuice 完成的 2017年3月7日

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