Post a link to your meter's user manual in English. There must be a way to force the meter to measure the resistance.
Resistance measurements will be in ohms.
Place one meter probe on mosfet pin #1 and other probe on pin #8. This check is the source-drain resistance. Never any power to the board in resistance mode checking.
Post the measurement and the units of measurement. Ohms, kohms, Megaohms, etc.
Or take a pic of each measurement of your meter face.
Yes, flux it well -> hot air till the solder melts - be patient and protect other nearby parts with low air pressure. Parts that can melt should be shielded from the heat. Then remove off the board -> allow it to cool and test the mosfet again using the same method.
BATT+ is the junction where the battery is used as the power source. In this case, the power adapter's DCin mosfets will be OFF, the charger mosfets for the battery @ PQ103 & PQ104 will be OFF. The battery flow through mosfet @ PQ102 will be ON. This battery voltage is ~9 volts and is ample to power the logic board.
Respectively, the V9B+ is the main power rail used to power the logic board. If the main power adapter is applied, then the ~19 volts will travel through the power path, through the enabled 2 x DCin mosfets to supply the ~19 volts onto the main power rail. In this case, since the power adapter is mated to the logic board, the battery charger mosfets will toggle on/off to regulate the proper battery charge voltage using mosfets PQ103 & PQ104 to a safe voltage. The current sense resistor in this battery charge circuit is monitored for safety.
The main battery mosfet @ PQ102 will be OFF in this case since the main power adapter is powering the logic board.
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