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How to test a MOSFET? testing a MOSFET short or not

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How to test a MOSFET? testing a MOSFET short or not​


We should test MOSFET in 3 corners, those are​


Drain to Source

Source to Gate

Drain to Gate



When testing on a motherboard make sure that motherboard not powered or not plugged in and don’t connect with battery.

Drain + Source = OL in 200 Ohm Range, it will have at least 100s Kilo Ohms
Drain + Gate = OL in 200 Ohm Range, it will have at least 100s Kilo Ohms

Source + Gate = 200 Ohm Range, it will have at least 100s Kilo Ohms



Probes can be in any sides, that does not matter

If low reading like 1.0 ohms or 2 ohms between pin Drain to Source, then that MOSFET is in On State. Then you can touch/short with a tweezer between Gate pin and Source Pin so the MOSFET will come to Off state. Then Check again.

After Shorting the Gate and between Source, still shows low ohms value then desolder that MOSFET and check that gain to make sure.

Good working MOSFET will have these ranges in Ohms Mode in DMM Digital Multi Meter or Ohm Meter
 
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