820-4924 no power green (orange) light missing PM_SLP_S5

adiazatis

New member
Hi, I have a 820-4924 that I'm working on. The board itself looks clean no signs of liquid damage. I have no power green light and missing PM_SLP_S5.
PM_SLP_S5 = goes up to 1.4v for a split second while Magsafe is initially plugged in. I do know that PM_SLP_S5 creates my EN for S4 but I'm not sure how to hunt this down. PM_PWRBTN_L goes low when pressing the power button. I tried a SMC bypass and still no power. I've attached some readings of what I have so far. If there is anything else you need to push me in the right direction please let me know, I appreciate it. Thanks.

PPDCIN_G3H = 16.74V
PPBUS_G3H = 12.6V
PPBUS S5 HS COMPUTING = 12.6V
PP3V42 G3H = 3.43 V
PPVRTC_G3H = 3.35
PP3v3_S5 = 3.35V
PP5V_S5 = 5V
PM_SLP_S5_L = 0V Diode 1.19
PM_SLP_SUS_L = 3.35V
PP3V3_SUS_EN =3.35
P3V3_SUS_FET_R = 3.35
PP1V05_SUS = 1.05V
PM_PCH_PWROK = 0V & Diode 1.49
ALL_SYS_PWRGD = 0V & Diode mode 1.2
P5VS5_FET_RAMP = 0
PM_SLP_S4_L = 0V & Diode 1.17
PM_BATLOW_L = 3.351V
PPVRTC_G3H = 3.3V
PP3V3_SUS = 3.3V
PP3V3_S5 = 3.34V
S5_PWRGD = 3.34V
SMC_ADAPTER_EN =3.4V
PP3V42_G3H = 3.43V
PP5V_S5 = 5V
 
Last edited:

2informaticos

Administrator
Staff member
"PM_SLP_S5 = goes up to 1.4v for a split second"
It pulses too when SMC_ONOFF_L is triggered?
If yes, check if PM_SLP_S4/3_L pulse.
Then check for pulses at all big coils at same moment.
No pulse at all at ALL_SYS_PWRGD?

BTW, in diode mode should measure with red probe to ground!
 
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