How to check MOSFET with multimeter (हिन्दी). www.arieslaptop.in
MOSFET is a field-effect transistor in which there is a thin layer of silicon oxide between the gate and the channel.
MOSFET used in Desktop and Laptop motherboards there are two different types of MOSFET
N-Channel MOSFET Used in Desktop motherboards while in Laptops (motherboard) both N-Channel and P-Channel MOSFET are used.
Ok! Enough talk about introducing MOSFET lets Do the testing Process and see which MOSFET is working one and which one is non-working.
During testing I will show you which one is P-Channel and which one is N-Channel MOSFET.
To test a MOSFET we will need a Multimeter and some working and non-working MOSFET.
Ok as we can see MOSFET consist of 3(three) pins
Now set your Multimeter to (Continuity Beeper) and Black Probe to Common Ground and Red Probe to Ohms(Everything but Ammeter).
Touch Both Red Probe and Black Probe and if your hear a beep sound than you are ready for testing MOSFET.
First we will check if this MOSFET is N-Channel or P-Channel.
N-Channel MOSFET: Connect Black Probe to the Drain and Red Probe to the Source of MOSFET
and if you get any Value on screen of Multimeter than this MOSFET is N-Channel MOSFET.If you did not get any value than better try second one.
P-Channel MOSFET: Connect Red Probe to Drain and Black Probe to Source and if you get any Value than its P-Channel MOSFET.
So now we know how to find P-Channel and N-Channel MOSFET so its time to test if its in working condition or not.
N-channel Working MOSFET: Now Pick a N-channel MOSFET and connect Black Probe to Drain and Red Probe to Gate if you don’t see any value than its working MOSFET.If you see some Value than its a (short MOSFET, a leaked MOSFET or not a MOSFET at all).
As its working MOSFET lets charge this MOSFET, connect Black Probe to Drain and touch Red Probe for few seconds to Gate and than Touch Red Probe To Source while Black Probe should stay Connected to Drain and you will here a beep which shows that your MOSFET is charged and in working condition.Remember to do the same test again you have to release to charge from MOSFET you can do this by Holding a MOSFET for few seconds between you fingers or just connect Black Probe to all three Pins at same time.
P-Channel Working MOSFET: If you have a P-Channel MOSFET than connect Red Probe to Drain and Black Probe to Gate and if you don’t see any value than its a working P-Channel MOSFET but if you see some value than probably this MOSFET is Short or leaked MOSFET.
To charge a working P-Channel MOSFET connect Red Probe to the Drain and touch Black Probe to Gate for few seconds and bring back the Black Probe to Source and you will hear a beep sound which means your P-Channel MOSFET is charged and good to go.
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