820-01521 - MacBook Air Stuck In S5 State - Not Booting

mccafe

Member
Hello,

I have a MacBook Air that does not want to boot. Here are some of the voltages I have been looking at:

20 volts at the charger and cycling between 0.00 - 0.04 amps.

PPBUS_G3H = 12.6
PP3V3_G3H = 3.3 volts
PP3V3_G3H_RTC = 3.3 volts
PP5V_G3S = 0 volts
PP1V8_G3S = 0 volts
PP1V8_SLPS2R = 1.8 volts
PP1V1_SLPS2R = 1.1 volts
PP0V8_SLPS2R = 0.8 volts
PP1V2_AWAKE = 1.2 volts
PP3V3_S5 = 0.44 volts *****
PP3V3_AWAKE = 0 volts

What should I check next?

I just realized G3S voltages missing typing this out..
 
Last edited:

2informaticos

Administrator
Staff member
"PP3V3_AWAKE = 0 volts"
Diode mode to ground?

All AWAKE and SLPS2R voltages must be present at the beginning.
 

mccafe

Member
Ohh, I see.

Diode mode for PP3V3_AWAKE = 0.579

PP3V3_AWAKE is actually 3 volts sorry about that.

PP3V3_S5 = 0.40 volts and diode mode is 0.290
 
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