HP Victus Charging Circuit Issue – System Extremely Slow, No Charging

[adelfr2009]

Hi everyone, I’m working on an HP Victus 15 motherboard that previously had a strong short-circuit on 19v line. The laptop now powers on, but system performance is extremely slow and laptop works only on AC adapter
This are Important PIN Voltage Measurements (ISL88739 Charging IC)

1 ACIN 2.08V
2 ACOK 2.94V
3 SDA 3.28V
4 SCLK 3.28V
5 #PROCHOT 0v
10 COMP 0V
11 CCLIM 4.14V
12 FSET 0V
13 BATGONE 0V
16 ACLIM 2.48V
17 NTC 1.60V
18 DCIN 19.51V
20 VDDP 5.15V
21 LGATE 0V
22 PHASE 0V
23 UGATE 0V
24 BOOT 5.01V
25 BGATE 0V
26 VBAT 0V
27 OPCP 0V
28 OPCN 0V
29 CMSRC 19.77V
30 ASGATE 10.33V ( is this value Normal? )
31 CSIN 19.24V
32 CSIP 19.24V



I have 3 MOSFETs near the charger input: identical ones in parallel (likely AFETs). 1 different one (likely SFET)


I ovserved that The 2kΩ resistor between ASGATE and the MOSFET gate is heating (observed by thermal camera) . One side of this resistor = 10.3V (IC side)
➤ The other side (MOSFET gate) = 19.7V
➤ CMSRC is also 19.7V

Despite these abnormalities, the laptop still powers on from the charger, but extremely slowly.

Could one of the AFET MOSFETs have gate leakage causing ASGATE to stay stuck at 10V? Or the problem on ic charger or all is good and this is not the cause of the problems ?