crwdns2934241:0crwdne2934241:0 Matt

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A1278 logic board will not turn on.

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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

crwdns2866306:0crwdne2866306:0:

MacBook Unibody Model A1278

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open