In the 23:40 of the youtube video https://youtu.be/YQ7SXJqIpzs , the presenter does a p-channel mosfet test for short, using his bench power supply on the circuit.
From what i understood, he disconnected the charger and with his bench power supply he applied the nomimal 19v with 0.5A of current on the Drain of the suspected mosfet. The DMM showed about 0.2A and he concluded that the mosfet is not shorted. I suspect the he tried to switch ON the mosfet externally but i can not see the actual wiring.
Can someone explain how this test works ? And the other thing i saw is that this laptop motherboard had two mosfet one n-channel that outputs to a p-channel. Why this combination is used ? I mean what is the purpose of this?