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Repair information and guides for the Apple iPhone 5s that was announced on September 10, 2013. Model: A1533, A1453, A1457, A1528, A1530, A1518

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Logic board getting hot, phone rebooting and battery indicator fluctuates.

Hi folks,

I bought a 2nd hand iphone 5s with the intention of learning how to do basic repairs (screens, batteries, etc). What happens to the phone doesn't really matter as I was prepared to accept that if I break it, so be it.

I decided to go one step further as the housing was battered, so I bought a new housing and transferred all of the internals into the new one.

Everything seemed to go well apart from the fact that I have what looks like a tiny washer left over. I've no idea where it came from and no amount of googling turns up an answer.

I also started experiencing the problems mentioned in the title of the post. The Logic board is getting hotter the expected, the battery shows 1% when I start up, then displays the actual amount of charge in the battery and then randomly fluctuates. Then after 2-3 minutes, the phone reboots.

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Iphone 5s part https://imgur.com/gallery/SDb9AAA

As i said, if the device is goosed then its no problem, but as i got so close it would be nice to get it working properly because I'd quite like to give it to my daughter so any advice would be appreciated.

Thanks in advance.

Answered! View the answer I have this problem too

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For the spacer, check out the third picture on Step 33 of this guide.

Was the phone working properly prior to being worked on?

Rebooting can be caused by a damaged modular component or logic board damage. The iPhone 5S is subject to pry damage when removing the battery (with the logic board still in place). The other possibility is connector damage.

Try disconnecting everything except the battery and Lightning port and then use 3uTools to see if the phone boots and stays on without restarting. If it doesn't restart, then one of the modular components is bad. If it does restart, then it's probably a logic board issue although it could be the Lightning port or battery as well.

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2 Comments:

Hello Minho. Thank you very much for your answer.

Although I didn't do any extensive testing prior to disassembling it, I played with it for 20 mins or so without issue.

I will try your suggestions tomorrow and report back with my results.

by

My pleasure.

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Matt Porter will be eternally grateful.
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