Macbook Pro A1398 EMC 2909 820-00138 powers on for 10sec then shuts off. No sound , no screen

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  • Joust
    New Member
    • Sep 2011
    • 5

    #1

    Macbook Pro A1398 EMC 2909 820-00138 powers on for 10sec then shuts off. No sound , no screen

    My MacBook pro charges fine. all voltages look ok with exception that I am measuring 1.78v where the schematic shows 1.85V on PPVCC. is that too low to work?
    It powers up for approximately 10sec then shuts off. Repeatable responding to the power button.
    I have tried everything i could find on searches.
    The only thing left perhaps is those three mosfets that provide that voltage.
    Is that what i should try next or does someone have a brilliant idea for me

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