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Repair information and guides for the iPhone 6S released by Apple on September 25, 2015. Models: A1688, A1633

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Battery not charging (Battery, Jack and Tristar replaced)

Hi,

My iPhone 6S don't load energy so i replaced the battery, charge jack and finally Tristar IC (two times).

I plugged the charge cable and with the multimeter measured the voltage which was between 0 and 1.5 Volts.

Someone can tell my what I did wrong or what could I do to get a higher voltage between 4.8 and 5 Volts?

I read some threads of this kind of subjects and they advise me to find the "pins" voltage and measure them (I know that in iPhone 6, are the C1704 and Q1701).

What "pins" needed to be measure on iPhone 6S (If possible some schematics of this pins, would be appreciated).

Thanks in advance.

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For any charging problems, the problem usually lies with either the battery, the Lightning Port flex or the logic board. Assuming you are confident that the battery and flex are known-good, let's focus on the logic board.

The charging circuit is based on the Tristar IC recognizing that a charger is connected, the TIGRIS IC that supplies the actual juice and the PMIC that regulates the whole thing.

You may have incorrectly installed the TRISTAR so you should check your work. You don't say how much experience you have in micro-soldering so I don't want to jump to any conclusions. One way to test the TRISTAR is to measure the voltage at the battery connector (without a battery) while the phone is connected to a charger. If you see anything less than 2V, then TRISTAR needs replacement.

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Hi @refectio ,

The first time I replaced the Tristar I thought I had positioned it in a bad position, but after removing it to solder a new one I saw the solder balls clean, without none of them touching each other.

So I guess the connections was good. The first and the second time e replace the Tristar I used solder wick with heat on that place in order to absorb the best possible the solder balls. And the board looks clean.

My experience is not the greatest, I study electronic engineering, but I'm not used to nano soldering.

I already measure the Tristar voltage using the multimeter on the battery port and the Sim card slot. And the voltage was around 0v and 1.5v. Witch stills not enough.

You said to measure the voltage on the battery port. Do you mean only on the battery port?

Could you tell me the names of the connections points, to trace all the voltage from the source of power (lighting port), to all the chips that could cause this kind of problem (like Tristar, TRIGIS, PMIC, others...)? I'm order for I make an scan over the board to find the source of the problem.

Or are the connections points to many to enumerate?

Thanks for any help provided.

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