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 some investigation, I discovered that the PROCHOT EXT flag is active, so something is triggering this signal.
Also, the laptop does not work with the battery and won’t start when powered by it.
I measured the battery voltage and got 11 V, so I believe the battery itself is fine.
For the PROCHOT issue, I have two main suspects:
1. Something related to the battery circuit on the motherboard.
2. A resistor between CSIN (on the charger IC) and the sense-resistor output (attached) replaced it with a 0 Ω resistor, but I’m not sure about its correct value.
I checked a schematic from another laptop using the same charger IC, and there it’s 2 Ω. I’m not sure if that could affect it.
Do you have any idea?
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 some investigation, I discovered that the PROCHOT EXT flag is active, so something is triggering this signal.
Also, the laptop does not work with the battery and won’t start when powered by it.
I measured the battery voltage and got 11 V, so I believe the battery itself is fine.
For the PROCHOT issue, I have two main suspects:
1. Something related to the battery circuit on the motherboard.
2. A resistor between CSIN (on the charger IC) and the sense-resistor output (attached) replaced it with a 0 Ω resistor, but I’m not sure about its correct value.
I checked a schematic from another laptop using the same charger IC, and there it’s 2 Ω. I’m not sure if that could affect it.
Do you have any idea?
Attached Files