820-3787 - NO S4

null

New member
The board had a short on U7501 on PIN 23 and 24
I replaced the U7501 and i got the PPBUS_G3H back, however, i dont have PP5V_S4.

Here is some measurements:
PP5V_S5 = 4.9V
PP5V_S4 = 0V
PP5V_S3 = 0V
PP3V3_S5 = 0.9V - Diode Mode 0.077

Any hint, helps.

Thank you
 

2informaticos

Administrator
Staff member
S4 state comes after S5.
You must fix 3V3_S5 issue first.

Post U7501 basic voltages; pins 23, 12, 13, 22, 29, 21.
 

2informaticos

Administrator
Staff member
3V3_S5 power supply is enabled.
Check sokders, traces and surrounding components.
If all good, change U7501...
 

null

New member
PM_SLP_S5_L and P5VS4_EN? No Pulse at all.
I try to triggering SMC_ONOFF_L and still.
 

2informaticos

Administrator
Staff member
Post PM_PWRBTN_L, PM_RSMRST_L and SMC_ONOFF_L levels.
Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L, at same time.
 

2informaticos

Administrator
Staff member
INTRUDER* and INTVRMEN are not in the same RTC block of PCH?

Also check PM_BATLOW_L, PCH_DSWVRMEN and PM_DSW_PWRGD.
 
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