MacBook Pro A1707 820-00928-A No power not turning on or charging

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  • TimScrawn
    Member
    • Dec 2021
    • 20
    • United Kingdom
    #1

    MacBook Pro A1707 820-00928-A No power not turning on or charging

    Got a very strange one here. Got an A1707 that came in dead no power. Plugged into amp meter and get 5v and then power cycles. After removing the board from the housing, I get 5v on all 4 ports with no amp draw, but it stays at 5v. I then check all rails:

    PPBUS_G3H - 2.3v - Not shorted (1.8 megaohms)
    PP3V3_G3H - 3.3v
    PP1V8_UPC - 1.8v
    PP3V3_UPC - 3v3v
    D6902 - 3.3v on pin 1 & 3

    I then saw these readings and thought, classic ISL9239 issue

    Removed ISL and replaced with donor board. Mac powered up to 20v and drew around 300mah

    Disconnected board to put in housing and then started getting 5v again. Disconnected and reconnected with no cables and get 5v. Checked ISL voltage and seems good. PPBUS now dropped to 3v again. Removed and replaced ISL again, same thing happens. Checked Mosfets but they seem good.

    Now stuck and need help.

    Thanks
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