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2020年10月13日に発表されたiPhone 12 miniはiPhone12シリーズの中で最も小型モデルです。5.4インチOLEDディスプレイ、A14 Bionicプロセッサにデュアルリアカメラを搭載しています。

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Battery Overheats and Quickly Discharges

My phone died and when charged it would not turn on after leaving it overnight. I took it apart and tested the battery ribbon cable and it read no voltage. I took the battery apart and measured at the battery terminals and it read 3.6v. I can read accross the ribbon cable and battery terminals and it looks like both sides of the ribbon cable have a positive voltage.

I bought a new battery and it powered up fine, but quickly got very warm and started to die very quickly. I plugged it in, powered it off, and left it overnight. I was not able to turn it on the next day. The new battery does now not ready anything accross the sides of the ribbon cable end. I havn't taken this battery apart yet.

Does this mean that the phone is damaging the ribbon cables (drawing too many amps) from a bridge in the phone itself. Any ideas?

Thanks

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What you are describing is probably a short circuit (or the start of one) on the logic board - Most likely on the PP_VCC_MAIN line that is continuously draining your battery. Your battery is most likely going into protection mode to prevent it from going into an over discharge condition, and it is just shutting off its output.

If you were to put a charge on it (both of your batteries) in a good device, they would probably pop back to where it should be with an output and work fine.

If you have the know-how, look up some schematics and a board-view or find the diode reading for the battery connector on the logic board, and see what values you are getting there. It could validate the issue is on the board - or, reach out to a repair shop locally that specializes in this type of repair.

Here is the 12 pro battery measurements

I would expect the 12 mini to be close to that. Let us know what you find!

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Thanks La Clinica de la Manzana for the detailed potential. Ya, I suspected some kind of short circuit. I might attempt this. It would be a learning experience, but I'm a firm beleiver of "learning on the job". I have an iphone 11. Do you know if the battery conenction is the same, so I can get the batteries in a good state and then at least have enough power to backup or transfer the phone to a new one?

Thanks for the response

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Mike S さん、ありがとうございました！
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