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A1278 Macbook no power

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    #1

    A1278 Macbook no power

    Hi folks,

    I've been troubleshooting a new board I got. It's a 820-2327-A A1278 M97 with no power. So far I tracked down the problem to somewhere around R6911/R6912.

    Pin number 1 on R6911 reads 16.5V however the other side (pin 2) reads nothing. SMC_BC_ACOK_RC is at 3.3V. I can't figure how that voltage disappears.
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    #2
    Re: A1278 Macbook no power

    Sorry bring this issue back to life, but did you find the solution for it? exacly the same board and problem in here...

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      #3
      Re: A1278 Macbook no power

      What's the issue? Do you have a green light on Magsafe? Does the fan spin?
      If not, did you go through the list of power rails and measure their voltage?

      Note that you need to press the power button (or short power pads) for it to turn on.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

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        #4
        Re: A1278 Macbook no power

        Its normal that there is no voltage there. SM_ACOK_RC is 3,3V so this circuit is working. Mosfet Q6910 is pulling the voltage to ground because of the 3,3V on the gate of the mosfet. Pretty sure ur problem is not here

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