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820-0289 No Power. Previously looked at by CPR

C

CGid

Member
Have an A2780 that is not powering on.

The USB-C Meter doesn't negotiate past 5V. However it will he at 4.9V @ 0.012A draw. Then Jump to 5.05V @ 0.920A draw and keeps cycling this behavoir.

PPBUS_AON = 11.97V
P3V8AON = 3.805V
P1V8VDDH - 0.35V up to 0.45V cycling quickly.
PP5V_S2_MAIN - 1.7V up to 2.05V cycling
PPDCIN_AON_CHGR - 4.927V

I'm not familiar with these newer boards in terms of what rails to check but any help is appreciated.
 
2informaticos

2informaticos

Administrator
Staff member
All USBC ports have the same behavior?
Tested with the board alone on the desk?
Tried known good battery holding some charge?
 
C

CGid

Member
I went ahead and tested with a known good battery. No behavoir change.
All ports behave the same.
Board alone on the bench, no change.
 
C

CGid

Member
U8100
PP3V8_AON_MPMU 3.807 V
PP1V2_S2 0.878 V (Cycling)
PP3V3_S2 1.171 V (Cycling)
PP1V8_S2SW_CLVR_VDDC1 1.826 V
PP3V3_AON 1.821 V (Cycling)
PP0V8_S2_CLVR_VDDDIG 0.251 V (Cycling)
PP1V8_AON 1.828 V
PP1V2_AON 1.466 V (Cycling)
PP1V5_AON_VCORE_MPMU 1.497 V

PP3V8_AON_MPMU 3.950 MΩ
PP1V2_S2 335.4 Ω
PP3V3_S2 60.60 kΩ
PP1V8_S2SW_CLVR_VDDC1 0.629 MΩ
PP3V3_AON 2.607 MΩ
PP0V8_S2_CLVR_VDDDIG 225.0 Ω
PP1V8_AON 2.162 MΩ
PP1V2_AON 0.727 MΩ
PP1V5_AON_VCORE_MPMU 119.7 kΩ


U7700
PP1V8_S2 0.570 V (Cycling) 51.80 kΩ
PP3V8_AON_SPMU 3.795 V
PPVDD_LOW_S2 0.133 V
PP1V2_AWAKESW_BLC 0.000 V
PP1V8_AON_SPMU 1.816 V
PP1V2_AON_SPMU 1.208 V
PP1V5_AON_VCORE_SPMU 1.498 V
 
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