A1278 logic board will not turn on.


820-3115B logic board

Won't turn on even by shorting pads.

No fan, no screen, no chime.

Mag safe is green.

No signs of liquid damage.

SMC bypass does not help

Voltages seem good:

ppbus_g3h = 12.22v



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

Diese Frage beantworten Ich habe das gleiche Problem

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3 Kommentare:

What does the battery test button show?


Battery test button flex is ripped. I have a new one on the way.

I don't even have the bat connected at the moment though. The board has bare minimum connections of AC and fan only right now. I can say that when I connect the batt, the magsafe does not turn orange even though I am 99% sure the batt is not fully charged.


Magsafe connected, power pads shorted, and I get no PM_SLP_S4_L. What could lead to this?


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