Released September 25, 2015. Model A1688/A1633. Repair of this device is similar to previous generations, requiring screwdrivers and prying tools. Available as GSM or CDMA / 16, 64, or 128 GB / Silver, Gold, Space Gray, or Rose Gold options.

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How to check for IC Tristar fault?

I replaced the rear housing of the phone and it's now getting really hot when I turn it on. The voltmeter keeps changing when I'm measuring the poles where the battery goes in from 4V to 0.4V. I've also replaced the power button but unplugged that and got the same result. The phone turns on after taking ages to charge but shows the home screen while the CPU gets really hot. I'm now wondering if it's the IC issue but I don't know how to check it.

Answered! View the answer I have this problem too

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You may be able to find your answer here How to I test the Tristar?

Good luck

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I get to the part with the voltmeter but I don't get a constant reading and it rapidly changes.

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@refectio you're pretty amazing at this stuff. What can you suggest?

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There's some good stuff in the answer you linked. Plus, the link provided by Wires Computing is very good also. However charging problems can also be related to TIGRIS or even the PMIC.

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I would give this a try :

https://www.ebay.com/itm/Professional-Ch...

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