MacBook Pro 820-3115 logic board has power but will not turn on.

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  • mattpd
    Badcaps Veteran
    • Oct 2012
    • 301
    • USA
    #1

    MacBook Pro 820-3115 logic board has power but will not turn on.

    A1278
    820-3115B

    No fan, no video, no chime. Nothing.

    Shorting power pads does not help.

    SMC bypass does not help.

    Mag safe is green.

    Voltages seem good so far.

    ppbus_g3h = 12.22v
    PPBUS_S5_HS_COMPUTING_ISNS = 12.22v
    PPBUS_S5_HS_OTHER_ISNS = 12.2v
    PP3V42_G3H = 3.505v
    PPVRTC_G3H = 3.343v
    PP5V_S5 = 4.94v
    PP5V_SUS = 4.9v
    PP3V3_S5 = 3.334v
    PP3V3_SUS = 3.34v
    PP3V3_S4 = 3.34v
    PP1V05_SUS = 1.05v

    Not sure where to go next.
    Tags: None
    • dj_ricoh
      Badcaps Legend
      • Jan 2013
      • 2073
      • uk
      #2
      Re: MacBook Pro 820-3115 logic board has power but will not turn on.

      Bios?
      Just cook it! It's already broken.

        Comment

        • mattpd
          Badcaps Veteran
          • Oct 2012
          • 301
          • USA
          #3
          Re: MacBook Pro 820-3115 logic board has power but will not turn on.

          Originally posted by dj_ricoh
          Bios?
          Best way to check? Just buy a flashing unit and flash a fresh copy?

            Comment

            • mattpd
              Badcaps Veteran
              • Oct 2012
              • 301
              • USA
              #4
              Re: MacBook Pro 820-3115 logic board has power but will not turn on.

              I think I am having problems with PM_SLP_S4_L. It's not present when the power pads are shorted...

                Comment

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