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Samsungの第五世代Android携帯のGalaxyスマートフォンは2014年4月11日に発売されました。指紋認識、より高度化したカメラ、より拡大したディスプレイ、防水性などを含む改良されたセルラーフォンです。4つのカラーから選べます：黒、ブルー、白、コッパー

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Questions about phone circuitry and charging of battery.

So I've had my Samsung S5 for about 3 years I think. I bought it when it was getting close to not being sold by ATT any longer.

It never worked all that well with battery daily battery life, but over the months and especially in the last couple months, I've gone through several batteries, about 6 or 7 from when I first purchased it.

I know that unused/shelved batteries do degrade even when not used, but I suspect that there is something defective in an IC or in the board circuitry that is damaging the batteries. They get super hot and over a very short time, and it's gotten unusable of late (about 30 minutes of battery lifetime and then fails at 50% charge).

Do any of you know of cell phones having circuitry issues that will cause batteries to fail so quickly, and would this start at the factory, or could it develop over time? I know that with some processors nano dendrites form inside the IC's nano transistor banks if it gets too hot or is over volted, but this isn't talked about much.

If I had the right tools and skills (I did study electronics and soldering a couple decades ago), could I chase down the failure mode and perhaps even replace a given IC or Capacitor? Are there factory cirtuitry manuals?

Update (04/06/2018)

So, when I am able to get the daughter board and other parts I will change it out. But I have a question, will the IMEI or any other number be affected by changing daughter boards and if so, are there any reasons to be concerned? And do I have to use the ATT one (it is an ATT phone)?

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Also, a tie in question, the cost of that daughter board and a battery and rear camera lens cover and case seal adds up to the value of the phone unless I buy for much less. On the one hand, I want to learn how to do this stuff and also I hate to waste the phone, on the other, if I fixed it and sold it, what would I even get for it. But about the IMEI, is the main board what that is stored in, or the daughter board?

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do you have any antivirus installed on the phone

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I did, but I recently removed almost all non included apps and I don't recall if the AV was successfully removed.

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try checking the battery under setting to see if it shows any app using alot of the battery

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On a Galaxy S5, the charging is on a separate 'daughterboard' from the rest of the phone. This daughterboard also has antenna connections, charge port, and mic built into it. You can try changing this specific board to see if your issue improves. Note that you have to get the AT&T specific version of this board.

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Thank you for that information, that hugely helps. Where would I get that daughterboard? I don't know where one gets parts.

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Directly here on iFixit actually.

Galaxy S5 (AT&T) Charging Assembly

Here is the teardown guide.

Samsung Galaxy S5 Teardown

I do have to warn you the LCD is incredibly difficult and delicate to disassemble. This is not for the timid at heart, and you will need to purchase adhesive to reassemble the LCD.

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Mark Hayward さん、ありがとうございました！
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