820-00244-A

[2click]

This board is not creating this lines:

PP1V_SUS
PP1V8_SUS

according to me U7800 should create those lines using some of the following that are present:

ppbus_g3h = 8.70v
PP3V3_G3H = 3.3v
PP3V3_S5 = 3.3v
PP5V_G3H = 5 v
PM_SLP_SUS_L = 3.3v

 

[2informaticos]

Not really true.
Did you check enable signal for these voltages?

1V8_SUS yes, should appear; it is directly controlled by PM_SLP_SUS_L.
But 1V_SUS is enabled by power good signal from VCORE_SUS_PCH.

You should fix the 1V8_SUS problem first.
Check diode mode to ground at L8020.

 

[2click]

DIODE MODE
L8020 = ,393

PMIC_SHUTDOWN_L = 3.3V
PM_SLP_S0_L = 2.7V
PP3V3_SUS = 3.3V
PP1V8_S3 = 0
PP3V3_PMICLDO = 3,3V
S5_PWRGD = 3.3V
PP3V3_S0 = 0V
PP1V5_S0 = 0
P5VS4_PGOOD = 0
PM_SLP_S3_L = 0
P1V8SUS_PGOOD = 0
PM_SLP_S4_L = 0
PM_SLP_SUS_L = 3,3
CPU_VR_READY = .063

THIS RAILS GO HIGH AND THEN DROP:

PP3V3_S4
PP3V3_S0
PM_SLP_S5_L
PM_SLP_S3_L
PM_SLP_S0_L

 

[2informaticos]

You have PM_SLP_SUS_L, but missing 1V8_SUS.
Why do you need the other signals posted?

If no short at L8020, check R8020/21/23.
If all good, change U7800.

 

[2click]

R8020/21/23 are good... replaced U7800 still having the same issue...

 

[2informaticos]

Possibly broken traces under U7800.
Check if 3V3_S5 and PM_SLP_S4_L arrive to its corresponding pads; 1V8_SUS power supply.