How To Test a MOSFET Transistor Using a Multimeter

In this video I demonstrate how to test a MOSFET transistor with a digital fluke multimeter in the off state and the on state. This transistor came out of a Samsung Plasma TV, but is widely used by many brands.

[@sadi3230]

Thank You Good tutorial..

[@snoopda1andonly]

+Tuan Sathiyan You're welcome. Thanks for the nice comment! Please like and subscribe!

[@antonioempleo3515]

+Runforlife ,,,very clear explanation ,,,good channel!

[@zozo71zozo71]

thanks

[@RC-Heli835]

Thanks!

[@dredrotten]

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.

[@Medig-oc2wh]

it was so annoying with all the other videos until I found this

[@nochkin]

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

[@wazandrew8202]

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.

[@keitharoo1962]

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

[@mrgreggwinfrey9298]

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!!

[@brazo98]

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! 💪💪💪

[@gaborudvardi9402]

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.

[@MuhammadShohaibHassan]

Thanks for the info. I saw a lot of videos and was wondering, Why my DMM can't charge Capacitor by touching the Gate.

[@bobszejk9620]

Oddly enough, I have a B&K component tester that shows 2.9vdc output on the diode setting but will NOT charge an IRF520. I have a Fluke digital multimeter that outputs only 2.5vdc on the diode setting but works perfectly on the SAME IRF520 every time.

[@Uvisir]

yeah some meters test with 7 Volt and some 3.5 V or lower etc, this needs to be checked first with another multimeter.

[@keithking1985]

An easy tester is a 9v battery with a single diode and led(with resistor if you want it, for indication) on one probe. Subtract the diode and led voltage and you got a simple polarity tester. (You still need a meter to measure voltage drop on it but got more than 2/3 volts to play with)😊

[@MrLennymon]

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

[@simonadeyi8093]

perfect video, clear English & easy to comprehend

[@alocin110]

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

[@bernhardjanssen9284]

Thanks a lot for teaching me how to test a mosfet hope i good learning more from you like other type of mosfet how to test thank you very much !

[@DanielJaegerFilms]

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!!!

[@irontoolgoddess]

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.

[@sand0077]

Short and to the point, thank you!

[@malcolmwicca]

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.

[@mareprah]

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

[@015diesel]

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.👍

[@TheBdd4]

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

[@snoopda1andonly]

+TheBdd4 Thanks for your comment! :)

[@markharris4260]

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 !

[@KAFA2020]

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

[@jimmartin8853]

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?

[@TutoPolo]

very nice, very clar, thanks

[@MEisLOLtoday]

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

[@TheVideoVolcano]

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.

[@alolouh6785]

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

[@265chemic]

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

[@jantvs9649]

Good tutorial

[@yron100]

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

[@Zomwil]

This video is actually really good

[@Vettemeats]

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

[@Enoch-Gnosis]

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

[@lawrencejelsma8118]

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.

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.

[@NSC-Modz]

Nice explained 👌

[@user-xh6cb9uh7f]

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

[@zahidabbasi566]

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

[@shellygoldensteinberg4521]

Excellent demo. Thank you.

[@user-ee1zn3yn1e]

Thank u for your good Training

[@kingjilheartbeats]

It's correct method,I do the same👍

[@britaniohilaw3537]

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

[@nicdheen2365]

Thank you

[@SilverMoonJoe]

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

[@dolleliteeluck9093]

Great video thanks a lot

[@tarashe_pc]

Perfect and practical bro 👌

[@johnpauljacob1704]

This is what i needed thanks

[@johnberry5339]

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.... :)

[@snoopda1andonly]

Great. Thanks for sharing!

[@8290Wgu]

thank you............. goods information

[@swarajprojects78]

nice tutorial

[@robertburgess968]

Great video. Very clear. Cheers. Legend..

[@skmash]

Thanks, it's clear. But what about P-channel MOSFET? Is it the same way to test?

[@jbvmpsmtr5488]

My question too 😁 do the test on P-channel! 👍

[@renstonyoung8146]

Really informative enjoyed it

[@keragala1]

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

[@Saf_R]

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

[@PatrickRibbsaeter]

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

[@cieloladra9469]

tnx so much for sharing ung knowledge👍👍👍GODBLESS

[@user-sn6sk7kc7e]

Thank you for your video

[@zahidabbasi566]

Very nice awesome video. Thanks sir (Pakistan)

[@MechanoloGeek]

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

[@rolandtutorial3377]

Great tips thank you so much 😊 😊

[@Jabanoflier]

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

[@vu2atn]

Very useful. Thank you.

[@mrtech9146]

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

[@obadiahberlass4290]

You are the best bro

[@ljose007]

Thanks for this great tutorial.

[@shibinshiji4671]

Thanks for your help

[@tonyminides1]

So useful, thank you

[@bluesteel5841]

Thank you, great tutorial..

[@snoopda1andonly]

You are welcome!

[@c4car478]

thank you so much for such great explanation.

[@snoopda1andonly]

Thank you!

[@kennethasonganyi9618]

Good tutorials 👌

[@lucbeauvais1847]

Thanks awesome explanation

[@MrNigel1340]

Excellent tutorial explained perfectly, thank you.

[@kooltechno5108]

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

[@andersemil5541]

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.

[@anwarnetservices]

Thanks very much

[@mojhajostechnique]

Nice one master

[@mikewelch8379]

Well done. Thanks!

[@tonyburgin1263]

This is how i've tested mosfets in the past. I found using the meter to charge the gate didn't work with every meter i tried.

[@davidbolha]

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

[@sigitsudarmaji8117]

very useful thanks

[@arabigamer1018]

thanks sir great tutorial

[@XBKLYN]

Thank you for the video...great stuff.

[@herminigildojakosalem8664]

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.

[@Teknickel_ftw]

thank you this helped me a lot.

[@fikfi891]

good explanation and clearly....

[@wegi9621]

That was good. Thanks. A bit missing show parasite mosfet diode.

[@marikkannanmarikkannan6448]

Great video! Simple and well explained....

[@casperakoma7273]

Thank you so much, i have learnt something today.

[@jvcute9515]

this is the tuturial i like ...1m likes for u...

[@miguelsalami]

EXCELLENT👍👍

[@mubarakka7364]

Okay sir thanks for next version

[@Spark-Hole]

The best way is to have a new one sit aside. Then do each experiment one by one on both MOSFETs alternately

[@balasuriyage]

Thank You Good tutorial..

[@alifahim2408]

thank you for explanations so informative

[@rizen68]

thank you very much

[@Bianchi77]

Nice video, thanks for sharing :)

[@ahmadal-tarabeen9253]

Does the measurements make any difference when its mounted on the PCB ?

[@indikaprabash8084]

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

[@ramonapool7510]

Very Good and Helpful video

[@whitecrow8140]

awesum vid.really great info and content

[@snoopda1andonly]

Thanks!