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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

Update (03/07/2017)

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@benjamen50

which one? the one @ the very right?

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Contestado! Ver respuesta Yo también tengo este problema

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Wait a second what is the kernel panic code?

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

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4 comentarios:

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

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It's not U2 it's PM IC.

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

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

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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.

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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.

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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

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My iPhone switches off when I lock it or when it’s go to sleep mode and for me to use it the screen must be on all the time please help

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i would send it to the store you got it from and see if they can do anything about

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Haha I got it back in 2013, in Tokyo, I'm currently in Jakarta

sad(T ^ T)

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