I injected 1V after the first current sense resistor and discovered there was leakage towards the CPU side, because when I measured the voltage at the CPU coil I found 0.5V. I then removed the coils and found there was a short on the side of one of the MOSFETs. The MOSFET is a dual MOSFET, and the short was on the high side — this was the cause of the leakage.
Now I need to know whether the CPU (Ryzen 7535HS) survived or not. When I measured the resistance on the CPU side, I got 2.6Ω (with bip). Next, I have to figure out the root cause of the short that led to all of this.
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I have a laptop HP Victus 15-fb with motherboard DAG3PRMB8D0, CPU Ryzen 7535HS, and GPU RTX 2050. The laptop has a power issue: it does not turn on at all, and there is no light on the DC jack.
After inspection, I found that an NMOS near the charger input had a short. I replaced it, but the short remained on the 19V line. I checked the charging circuit and it was fine, but the short appears after the current sense resistor near the charger. The charger does not pass current when connected, so I inject 3V–4V after the sense resistor. No component gets hot, except the CPU which becomes...