A1278 logic board will not turn on.
A1278
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
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
What does the battery test button show?
mayer さんによる
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.
Matt さんによる
Magsafe connected, power pads shorted, and I get no PM_SLP_S4_L. What could lead to this?
Matt さんによる