Assuming you only have a multimeter, you can try this..
Shorted Pin Check
- Set your multimeter to the continuity or diode test mode.
- Check for shorts between each pair of pins (Gate-Drain, Gate-Source, Drain-Source).
- There should be no continuity between any of the pairs. A beep or low resistance reading indicates a short circuit, and likely a damaged MOSFET.
Resistance Check
- Set the multimeter to resistance mode.
- Connect the multimeter leads to the Drain and Source pins.
- Without applying any voltage to the Gate, the MOSFET should be "OFF", showing high resistance (ideally, it should appear as an open circuit).
?
-JJ
