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iPhone5C charging port fault

the charging port on my iPhone 5C is faulty. The symptoms is the phone will not switch on or show any signs of life. I opened the phone, lifted the screen and I removed the battery plug. I put a voltmeter across it and this read 0V. I then connected the phone charger and switched it on then put a voltmeter across the pins in the socket that takes the battery plug and this also read 0V. From this I assumed that there is no voltage reaching the battery socket to charge the battery or switch the phone on. and this can only be that the charging port is faulty and needs replacing.

have I made the correct assessment? Is there anything else that maybe responsible for the voltage not reaching the battery socket? Phone Charger is in full working order as it charges my iPad and another iPhone.

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Thank you. I did not connect the phone charger with the battery unplugged... I thought we should only connect it with battery plugged in. Should I try what you are suggesting?

Also , is there a way of determining whether it is the charging port or the chip?

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Ok thank you. I have bought the charging port replacement. And I will fit it as soon as I get it.

But I thought maybe I can use it as a test port before doing the replacement. So which bits do I need to connect to the phone just to do the power /voltage test? Is it just the plug that goes into the socket next to the battery socket and the single long wire that fits next to the battery socket? Or do I need to connect anything else?

I thought all the other stuff is to do with speaker and headphone jack and so on....

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You can just plug in the main connection of the new charging port and plug a lightning cable into it to test. Almost all components run through this one connector. If you still don't get any signs of life then either you have a defective part, or the u2 IC chip has failed and will require a logic board specialist.

I find the most common cause for the failure of this chip is the use of cheap aftermarket lightning cables.

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Yep the non MFi certified cables dont have voltage protection meaning that any fluctuations in voltage going through the cable to the phone is not regulated and can damage the Tristar U2 charging IC if it goes too high.

The combination of a car charger and a non Mfi certified cable is the worst scenario as you know car batteries and their power fluctuate a lot due to the car battery getting recharged when the car is on.

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As the charging port was not passing the voltage to charge the battery, I bought an iPhone battery activation/charging board. I connected the battery to it and charged the battery to almost full. . I then connected the battery to the phone. And it switched on. The phone now works. I then connected the phone charger to the charging port of the phone and it started charging the battery. So now everything on the phone is working.... so why there was no voltage at the battery socket before and why there is voltage there now?

Not that I'm complaining, but Can someone explain what is happening?

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If there's 0V in the battery, then the battery is faulty.

But, as you said you're also getting 0V with cable plugged in to the phone.

Does the phone not show a Apple logo for a few seconds with cable plugged in and battery unplugged?

If not, this is either a faulty charging port, or it's more than likely Tristar/U2 IC chip damage, this chip is damaged via cheap cables etc. And would require microsoldering. :-)

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Thank you. I did not connect the phone charger with the battery unplugged... I thought we should only connect it with battery plugged in. Should I try what you are suggesting?

Also , is there a way of determining whether it is the charging port or the chip?

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Yep. Try a known good charged battery. It should turn on. If not then there is a bigger issue.

Then try charging it when it is turned on. If no charge try another charger port plug in for testing. Still no charging? Tristar u2 charging ic gone bad and needs to be replaced.

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Ok thank you. I have bought the charging port replacement. And I will fit it as soon as I get it.

But I thought maybe I can use it as a test port before doing the replacement. So which bits do I need to connect to the phone just to do the power /voltage test? Is it just the plug that goes into the socket next to the battery socket and the single long wire that fits next to the battery socket? Or do I need to connect anything else?

I thought all the other stuff is to do with speaker and headphone jack and so on....

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Well if you have a digital multi-meter this should work:

Don't have the screen or battery plugged in, only the charging port. Plug the charger to the phone. Measure the voltage from the battery connector on the logic board, positive / negative and I think should be like 4.5V (Not really sure)? If it's like 0v then I think it's probably the charging IC not allowing power going to the battery connector.

I could be wrong though you may need to have a battery installed and instead use one of those USB voltage current detector tester dongle thingies.

Either way the phone should turn on even with a faulty charging IC chip if the battery has enough charge like 3.7v-4.2v.

Having the battery externally charged by a apple battery fast charging activation test fixture or another phone works so that you can get it charged enough to get the affected phone to turn on.

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Thank you so much Ben.

One other question. Which is the positive and which is the negative battery terminal. Please advice for the battery plug and/or the socket on the board. Maybe I can also charge the battery by connecting it with wires to an external battery charger. I can use an old phone charger say a 7v. But I need to know how to connect it. I couldn't see any markings on the battery or the socket that is on the board.

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