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HP Victus Charging Circuit Issue – System Extremely Slow, No Charging
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... -
PROCHOT EXT problem after charger repair
I have a charger IC similar to the one shown in this figure (ISL88739B). During a short-circuit repair, I had to replace the resistor marked PR13 with a 0 Ω jumper, because the original one was burned and I couldn’t find the schematic for my laptop to know its exact value.
On my board, the current-sense resistor (shunt) is 0.005 Ω (not 0.010 Ω), and I noticed that this small resistor (PR13) is connected between CSIN and the shunt output, forming part of the current-sense network.
Could using 0 Ω instead of the original value (probably around 2 Ω) affect the charger... -
HP Victus 15-fb (DAG3PRMB8D0) – ISL88739B replaced, now PROCHOT EXT active and slow CPU (0.4 GHz)
Hello .
I have an HP Victus 15-fb laptop with the DAG3PRMB8D0 motherboard, Ryzen 7 7535HS CPU, and RTX 2050 GPU. I had a short on the 19 V line, and I was forced to replace the following components:
1- 2 nmos near dc jack connector
2- ic charger (88739b) + small resistor between CSIN pin and sense resistor output
3- i changed also a 1 dual mosfet in VRM
After replacing the VRM MOSFETs and the charger IC, the laptop works and the CPU survived 🙏
However, now I have a problem: the laptop is very slow, running only at 0.4 GHz.
After...
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