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Repair information and guides for the iPhone 6S Plus that was released on September 25, 2015. Model A1687, A1634

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Can the u2 ic damage prevent Touch ID?

Hi.

Can a damaged u2 ic prevent b Touch ID/home button from functioning at all?

It has completely stopped working and the screen never changed/button removed.

What are possible causes of this?

Thank you.

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Normally, you wouldn't expect Tristar to affect the TouchID function but looking through the schematic, I did notice that PP3V0_TRISTAR serves as an input (MOJAVE_EN_M) to MOJAVE MESA. Therefore, if PP3V0_TRISTAR is not present, then it will not enable MESA.

So double check your work around Tristar and probe the voltage rails to insure everything is correct.

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