Help understanding "AMUX" section of a power chip

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  • caphair
    Badcaps Legend
    • Nov 2011
    • 1249
    #1

    Help understanding "AMUX" section of a power chip

    Have a rare case of an iPhone 6 with no display.

    When I measure chest_pwr_en it's low at 1.1v should be 1.8v

    I've removed the one cap on that line and even removed "chestnut" power display ic u1501 but still the voltage stays at 1.1v

    Only other point that line goes to is to u1202 which is the main power management ic in the "AMUX" section which has to be what's pulling the voltage down from 1.8 to 1.1.

    Anyone know what this section actually does? Hope the pics are clear they're screenshots from the PDF on my phone
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