How To Test a MOSFET Transistor Using a Multimeter 

Thank You Good tutorial..

This is the clearest and best demonstration of checking Mosfets I've found so far. Good on you for taking the time and trouble to do this for mugs like me! My search is over, I'm now confident in doing this.

I got myself a transistor tester, but this method is still extremely valuable when you don't have access to other tools. Thank you.

this video is 6 years old as i watched it today, even six years after posting it it still helping people. thats brilliant, thank you i am more wiser on testing mosfet now.

Thanks for showing how to do this with a known good mosfet and a bad one..no more being confused by the other videos on how to test!! You won yourself a subscriber!!

Watched the video, immediately tested my MOSFET. Thank you SO much for the information!

That's worth a subscribe. So many videos, so technical from so many super smart dudes that could not correlate to me so easily as you have done ty

I had a trailer brake controller which was constantly applying the trailer brakes even when the truck was off. Happened to find this video while googling the transistor number and found the transistor was shorted internally just like the one in this video. Thank you so much!!!

Nice video! Just a notice: most multimeter operates between 1V to 2V in diode tester mode which is not enough for a switching MOSFET to open.

Thx a lot for your movie! Today I bought a simple china component tester! It make my live so easier! I don‘t soldering anything out and nothing! Clip on the wire measure in secounds, done! Perfect! 💪💪💪

perfect video, clear English & easy to comprehend

Excellent video mate, first class! You really do make it simple even for newbie's like me to understand and for that I thank you very much.👍

Short and to the point, thank you!

Many thanks for this tutorial. Just got some Mosfets off a Brushless motor ESC and found 2 duff and 4 working OK. I'm making a flashing 10W LED lamp to put in my model aircraft for when they go in to cloud or otherwise out of sight, and needed the mosfets to switch the power on and off to the LED driver.

THANK YOU. helped me figure out for the first time of my life if a mosfet it good or not! :D

Both of my meters are similar types (read the same way) as yours. Other videos show different readouts, and I was still confused. Now with yours, I know my MOSFET IS faulty. Thank you.

Man, I would just like to express my sincere thank you!

Thanks for this tutorial. It helped me fix a GPS problem (level shifter MOSFET was being uncooperative) with my HAB flight tracker for my dissertation.

Thank you for sharing. Good explanatory and simple tools to test. Thank you again.

Excellent demo. Thank you.

Outstanding video. Very well explain and simple to understand! Keep it coming... 73, Joe-K4JGA - JGA Electronics Repair Center, Florida

simple and right to the point " that was a good way to demonstrate that ! Also if checking power mosfets with ohm meter set to ohms reading and you get ANY reading between any combination of gate to drain or source to gate ect that shows a dead short the mosfet is bad it's shorted ! but make sure to discharge it by holding the three leads between your finger and thumb before doing dead short test this way ! I have had many mosfets read .437 and ( point 437) work fine as that is residual capacitance in the internal circuit ! always check a new one before installing it !

Thanks for the help! Because of this video I found that a MOSFET I suspected to be bad turned out to be good. Ended up fixing a device which really had a bad electrolytic cap. Who would have guessed?

Very simple and valuable explanation. Useful for beginners like me. Like to watch your other videos. Tanks.

good tutorial.at the beginning you have to short those pins with the negative lead but everything is correct.once again good job.

Thank you for posting this. :-)

Thanks, helped me test and prove a MOSFET in a Honda CBR indicator relay was good

Hello, Thank you very much for this info/tutorial. ☺

Thank you for the video...great stuff.

Thank you... very helpful

Excelent tutorial bro 👍

A video well done. I design circuits, but did not have this test technique in my bag of tricks. Thank you.

Very informational video, thank you very much for posting :)

Excellent tutorial explained perfectly, thank you.

Great video! Simple and well explained....

Thanks for this great tutorial.

HI. well explained. in very simple way. thank you very much

Masha-Allah. Zazakallah Khyer. You are very helpful for every engineering students.May you live a long life with Full of gladness and health.

so darn useful, thanks!!

thank you for explanations so informative

Thank u for ur lessons it help me alot great work explain very clearly an simple

On and Off state ...again learned something new... thx verry much.

awesome video.. the most simple and easy explanation on the internet.. everyone else seems to make it so difficult.. good job.. if u can show this on a laptop motherboard that would be very helpful .. thanks

thank you this helped me a lot.

I found this video informative and great to have produced. I forgot the charge up of source to drain part to develop a capacitive voltage for a short while in good MOSFETs. I would want to double check my schematics of the MOSFET to know where the source and drain are vs gate to drain shorts. I don't have a transistor checker multimeter yet.

Very useful. Thank you!

Million thanks for sharing.big respect

Saved me a ton of time. Thank you!!!

That is very clever! Nice one :) PS. I do like your meter..

THANK YOU ! you saved me a ton of trouble shooting !

thank you so much for such great explanation.

build a simple tester with an old analog meter, or even a vu meter movement. use a 9 v bat. or two in series with a resister (to limit current to full scale deflection) and red and black alligator clips. clip across collector-emitter and activate base with just a finger from base to col. Same with MOSFETs. you can actually see the transistor switch off or on with a slight brush against the gate from either drain or source. sorry, cannot easily do a video of this but a very simple analog "super ohmmeter" demonstrates transistor,fet action. Also handy to confirm leakage of capacitors that digital meters miss.

tnx so much for sharing ung knowledge👍👍👍GODBLESS

Thank you so much, i have learnt something today.

Fantastic and educative video ❤❤❤❤🎉 excellent work bros.

This video is actually really good

thanks a lot.. very good tutorial..

Thank you,great great.....please more

I have learnt , thank you

Good tutorial

Thanks for your help

very good tutorial,thanks! now i know what that diode-capacitor test mode is for.. :-)

This is a great tutorial, I have just tried this with my IRFZ44N Mosfet and it works perfect. I have liked and subscribed. Thank John.... :)

awesum vid.really great info and content

Great video. Very clear. Cheers. Legend..

Awesome video for learning, also your way of explaining is well. Thanks brother-Pakistan

Great Info, Thank you! But for the sake of newbies like me, you should have explained as well how come touching the Red Probe of the meter (with the meter in Diode Test Mode) to the MOSFET Gate charges it (if you get my drift, that is). Thanks again.

Awesome video. I have a bad power board in my LG oled tv and I suspect one or two mosfets are burnt. Gonna use your method to test those. Thanks a bunch.

Great tips thank you so much 😊 😊

Nice video, thanks for sharing :)

Thank you very much! It's really good tutorial ! I's this method worked to SFP730 transistor?

Thank you for this toutrial

Be aware that this works *only if* the voltage provided by the dmm to charge the gate is above the mosfet's gate threshold voltage. The high-voltage fets have Vgs-thr above 4V. Some even atound 10V. The low-signal and ultra-low voltage have lower voltages but not much below 4V. A regular dmm outputs about 1V...2V with high impedance. Some up to 8V on a 10Mohm load. It is safer to use a variable power supply with a high-value series resistor as s gate charger.

Very useful , Thanks 👍.

Nice tutorial! Should I remove the mosfet before testing? or can I test it while in the PCB? Thank you!

thank you! very good tutorial thumbs up =)

now I know...thanks for this explanation I got new knowledge

Very useful. Thank you.

This is how you should do a tutorial short and to the point!

So useful, thank you

Really informative enjoyed it

Good one. I like your explanation. Thanks for this vid.

This is what i needed thanks

nice and simple, thanks

Thanks! I'm gonna test a few in my dead tv

Perfect and practical bro 👌

very nice, very clar, thanks

Very Good and Helpful video

Very useful. Thanks

very helpful thank you

Thank u for your good Training

Good, i hve been looking for something like this thank you for sharing

Well done. Thanks!

very clear explanation. now I know. Keep it up. Thanx u.

good explanation and clearly....

loved it ... thank you

Well explained. Cheers,

Thanks awesome explanation

Thank you for your video

thanks for sharing!