How To Test A Power Supply Unit (PSU) With A Digital Multimeter

How To Test A Power Supply Unit (PSU) With A Digital Multimeter | Advanced Troubleshooting

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Күн бұрын

In this youtube video tutorial I show you how to test a psu with a multimeter or how to test a power supply unit using a digital multimeter. This is an advanced troubleshoot tutorial. There is a paper clip test you can do to check if a power supply is dead or not. However that test only checks for power but not for correct voltage.
First you need to test for AC Voltage coming from the mains plug. Next you need to test for DC voltage from each of the pin on the power supply unit.
Standard ATX 12V power supply units can be either 20 pins or 24 (20+4) pins. The method is the same for each.
This video is also a stand alone tutorial as part of a longer Troubleshoot series, see details in the video and below.
Time Stamps:
00:36 Troubleshoot Series Intro | Desktop Pc Computer Not Turning On No Display | How A Computer Works
• How To Troubleshoot A ...
00:44 Test A Laptop Charger Adaptor With A Digital Multimeter
• How To Test A Laptop C...
00:50 Troubleshoot A Dead Computer Pc No Power - Desktop PC Computer Not Turning On At All Easy Fix Repair
• Troubleshoot A Dead Co...
00:55 The paper clip test
001:43 Power Supply Unit Replacement Under 2 minutes Challenge
• Power Supply Unit Repl...
01:55 Mastech Digital Multimeter MS8268
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02:53 UK AC Voltage Range: 216.2 to 253V
www.nottingham.ac.uk/etc/guide...
03:02 Tolerance of -6% to +10%
04:42 Turn a Computer Power Supply into Bench Power by Jason Poel Smith
makezine.com/projects/computer...
06:00 Laptop No Display Black Screen Blank Screen On Startup | Best Guide How To Fix Troubleshoot Repair
• Laptop No Display Blac...
07:26 DC Volt Tolerance
Red/Purple: 5V +/- 4% = 4.8 to 5.2 V
Yellow/Blue: 12V +/- 4% = 11.52 to 12.48
Orange: 3.3V +/- 4% = 3.168 to 3.432
10:18 How To Take Out Or Remove A Motherboard From A Desktop Computer Case | Breadboarding Easy Mode
• How To Take Out Or Rem...
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Пікірлер: 485

@srinivasaraoyp3640 5 жыл бұрын

I have assembled so many desktop computers and troubleshooted laptops, today, I have learned a new lesson from you. Your demo is outstanding. Everything is very clear. I felt as it is done in front of me. Awesome Sir, Thank you...

@danielbarbosa3 2 жыл бұрын

I second this comment. Very nice. Exemplary vídeo.

@PrincernPrince 11 ай бұрын

Yep I would just process of eliminate and get to PSU but this helps.

@hitodium 4 жыл бұрын

1. connect pin 15-16 to turn PSU 2. connect black needle to pin 24 and red needle to pin 13,14, 21,22,23 3. connect black needle to pin 14 and red needle to pin 1,2,4,6,9,10,11,12

@HealMyTech1 4 жыл бұрын

Cool summary!

@NYMT19 4 жыл бұрын

@@HealMyTech1 thank you a lot for the tutorial One question: the blue colored wire (-12V) reading is 11.3V for me, every thing else is good even the cpu, gpu and molex connectors. Does that mean I need to replace the PSU?

@wasimdanawala 4 жыл бұрын

Just a correction to call out on point# 3. It should be Pin 15 for ground instead of Pin 14 which is blue

@RogerThat1945 3 жыл бұрын

When I do the following;- 1. connect pin 15-16 to turn PSU (all Ok) 2. connect black needle to pin 24 and red needle to pin 13,14, 21,22,23 (Ok- all is good) 3. connect black needle to pin 14 and red needle to pin 1,2,4,6,9,10,11,12 (WTF ??) The First set are spot on; but the 2nd set Are either 3x the listed Voltages (1 & 2 supposed to be 3v but are 15.57..v), and (4, 6 & 9 supposed to be 5v = but are 17.4v) & in the case of 10 & 11 they are near zero volts at 1v? or something;- ( '1 . ) . And next, the 12th pin (supposed to be 3.3v) is 15.6v or so Looking inside the PSU is relatively clean and looks perfect. PC was running fine... but PUBG kept crashing halfway through the game. Then when I re-booted after the BIOS it went dead with one white underscore on a black screen. So, assumed CPU or GPU, but then wondered 850W Platinum PSU made in China maybe at fault. Wondering if i7-4770 CPU could have caused it?; or even TUF Motherboard? Or Strix GTX1070?

@aloneholic 3 жыл бұрын

Hai indonesian

@Frank-in-NY Жыл бұрын

Thank you so much for this video. It's been over 20 years since I worked as a Technician. You reminded how to be one again. Pointing out the the Power On jumper did it for me. Appreciate the safety tips as well.

@danielburnell201 4 жыл бұрын

Great video dude! As the start I didn't even notice the other person in the video. When the hands moved I was like hey! Hold on a minute 😅

@SubwayJack919 2 жыл бұрын

Thank you sir! Just tested my first power supply. They explored a little further after the confidence of this video and looked up and tested all the parts on it as well. Thanks for the great video!

@tge2479 6 жыл бұрын

I like the consistent uploads, great work

@hello55125 6 жыл бұрын

Good videos, straight to the point and very informative. Thanks !

@joshp9842 3 жыл бұрын

Thanks for the video, this helped out a lot when I was troubleshooting a new PC build.

@DigBipper188 4 жыл бұрын

It should be noted that you can sometimes have failed power supplies that output at a voltage that's within tolerance with no load on the voltage rails. While it's more common that a rail will just outright fail, I have had instances where a PSU will output the correct voltage when measured, but when loaded it drops down to next to nothing. What I do the mitigate this is to put a modest load, say, a 20w incandescent lamp or a resistor on the rail I am testing and then measure voltage. This will yield a more reliable measurement when testing for a failed supply as it should also factor in how much voltage drop you get on the rail when it's under load. Additionally, a time-saving trick: every wire in the PSU is grouped by voltage on the output section of the supply's circuit board. This means, that unless you have a multiple +12v rail design (which can be seen in higher end power supplies), that a +12v on your EPS+12 connector and a +12v on your SATA power / MOLEX / FDD connector will be connected to the same point on the power supply, therefore should have continuity between the two wires. For this reason, I tend to simply test one wire from each voltage rail. Unless it's a multi 12v rail supply and I don't know where the wires are allocated, then I will test all of the wires with a load across my probes to confirm that all rails are working properly.

@BMC530i 4 жыл бұрын

Thanks for the video! Keep up the great work!

@PigeonDesign 2 жыл бұрын

Great video, very informative. Been a builder for a while now and just started making my own cables. Came in handy when testing my work! Thanks!

@alvydasjokubauskas2587 10 ай бұрын

use another working pc for 5 minutes to make sure it is working.

@Auxcordbroke 4 жыл бұрын

Very well explained. Thank you. Learned something today 👌🏽

@marycarvesthechicken7380 3 жыл бұрын

Thank you, brother! Everything worked exactly as you said it would. Very Helpful.

@drewnashty 3 жыл бұрын

This is a good intro for entry level troubleshooting for a PSU, but what I would call "Advanced Troubleshooting" would be testing the voltage lines under load, which is a little more difficult. As a PSU could appear to be working just fine until you get it under an extensive load like in a video game or rendering session whereby the PC would restart due to a drop in voltage (most likely on the 12V supply) from a lack of current, measured in amperes, and is otherwise not sufficient under such load.

@SuperKiki93 2 жыл бұрын

How does one do this this?

@drewnashty 2 жыл бұрын

@@SuperKiki93 Are you seeing my post? I can't see my comment wtf, do similiar to what he is doing but under load you can use the search watch?v=ZiYFwjdh_lE I just know how much my various hardware consumes so when I bench test a PSU I just choose the hw based on how much 12v amperage I am trying to load up on the PSU.

@cmdelpino 3 жыл бұрын

Exactly the kind of video I was looking for. Gracias!

@mekamek891 5 жыл бұрын

dude for like 89% of the video i thought the black hand sweater thing was like an automatic weird unique prop holder. it was moving erratic an creeped me out. but when you told it to hold this and it lurched forward i realized it was a humanoid.

@larryruby 5 жыл бұрын

I love the thought he put into making this a good video. The humanoid kept things moving and the black gloves keep focus on what is important

@aaronjosephtecson5639 7 ай бұрын

Hey King, you dropped your crown! Thanks for the detailed instructions on how to check PSU!

@anne4381 2 жыл бұрын

Best turorial I've seen, easy and detailed. Thank you!

@typical_arthur 5 жыл бұрын

very informative, thank you :)

@HWandW 4 жыл бұрын

Very well done! I tested the same PSU; so this video was perfect. Thank you.

@HealMyTech1 4 жыл бұрын

Glad it helped!

@WRXMK 3 жыл бұрын

Great video! Thanks for making this.

@evildiesel1709 Жыл бұрын

Thanks! Excellent video. I used this method to make sure a psu wasn't faulty, it wasn't. Turns out disconnecting absolutely everything from the motherboard and jumping the clear CMOS pins brought the PC back.

@outlet6989 11 ай бұрын

Very easy to understand. When I test a PSU, I also test all other cables.

@wasimdanawala 4 жыл бұрын

You have been very helpful, knowledgeable, honest and practical. Stay blessed

@SuperNidey 4 жыл бұрын

Thank you so much for this! Very helpful

@errk8093 4 жыл бұрын

Great help/ instructions!

@nirupammukherjee215 3 жыл бұрын

This was a very helpful video. Helped me and my son to trouble shoot effectively a non working PC that he has assembled. The problem was that the 24 pin connector had no white wire. We could find that out easily. Thank you for this great and useful video.

@OorahhColeman Жыл бұрын

I think it's supposed to be that way. Mines the same way. There used to be a -5v white but apparently they ditched it in '03

@michaelhackman3195 3 жыл бұрын

You're a champion, thanks so much for the video, was super helpful

@ronarscorruption 5 жыл бұрын

This was perfect, exactly what I needed to narrow down my problems. My power supply is definitely working!

@docktershok 2 жыл бұрын

Thank you for this concise instructional video! The diagrams and step by step process helped a ton!

@inspirationalclips1422 Жыл бұрын

This Guy saves me to My Test 2 Practical and now I'm Comfortable ☘️💯

@loelie01 4 жыл бұрын

Good tutorial, helped me through the process without doing injury to myself or my computer and happy to report my PSU is 100%. Thanks!

@lemonimport 2 жыл бұрын

Thanks a lot for this great tutorial : very good step-by-step explanations.

@brianburke2670 4 жыл бұрын

Very clear and useful tutorial thanks

@Johny40Se7en 3 жыл бұрын

Thanks a lot. Very in depth.

@JonathanBlackmore 3 жыл бұрын

Our PSU was great, the problem was with the Power cable. Thank you for a very informative diagnostic video.

@HealMyTech1 3 жыл бұрын

You're welcome!

@corndogers564 2 жыл бұрын

The power cable can cause issues for the psu??

@JonathanBlackmore 2 жыл бұрын

@@corndogers564 Yes. The video shows how to test the cable. We had a faulty one that was providing lower voltage than the PSU required. Changed the cable and the PSU was fine

@OXFORD486 6 жыл бұрын

A lot of great info...

@JesusOurKing 6 жыл бұрын

Excellent. Thanks. My PSU is good.

@choppersurprenant7057 3 жыл бұрын

Thanks for the video 🙂!

@LeonerPerez90807 3 жыл бұрын

Fantastic Video! Thank you

@ReydioTube 5 жыл бұрын

Thank you for your service sir 🖖

@mx676 3 жыл бұрын

This was easy and fun. Great content! You should add a pinout sheet in description. I used one to test my CPU and PCIe cables.

@billyboy911 2 жыл бұрын

Great video and thank you so much for it. Lucky me found it too. Ill just echo what everyone else said. Even in a quality tech school you dont get it this easy and precise almosat like one on one instruction. . The pinout charts were beautiful. Now the PSupply im only 20% worried about i can test instead of testing it first blind with the new pricey board and processor i just installed. Thanks guys. Edit to add: Just finsished the test exactly as shown and voila i KNOW i have a 100% power supply on all circuits...nice!!!

@mustafaziyai7628 2 жыл бұрын

Nicely and deeply explained Keep up the good work 👍

@youbuyer Жыл бұрын

Very helpful- Thank you!

@therobotguide 5 ай бұрын

thanks for sharing your knowledge and giving me the confidence to debug a faulty PSU to graphics card connection

@seb_is_class8107 10 ай бұрын

Thanks brother! This was a simple lesson and it helped a lot

@SuperPercy66 Жыл бұрын

You are the top man and the first go-to when I need advice - cheers 👍

@markjching 3 жыл бұрын

Your video is very helpful.

@entrluzrnaam Жыл бұрын

Helpful video, thank you!

@cyalknight Жыл бұрын

Thank you! I know the power supply works now, even got the drives working. Now need to troubleshoot the motherboard and the power switch.

@cyborg6294 5 жыл бұрын

Thank you so much while i know these things but your video is excellent and so detailed

@HealMyTech1 5 жыл бұрын

Thank you for appreciating!

@carltonbless5992 Жыл бұрын

Very informative. Thanks.

@mpeugeot 3 жыл бұрын

Really straight forward and well done video! Nicely done, Sir.

@revitoguanto4111 Жыл бұрын

thank you very much! perfect guide!

@oldgittarist Жыл бұрын

Very helpful!

@jetcity7156 5 жыл бұрын

Thank you for this video!

@QuranandAhadith 4 жыл бұрын

Great video bro

@zeeshanalimannur5704 3 жыл бұрын

Thank you soooo much !

@azulamazigh2789 6 жыл бұрын

keep the good job

@turbocivic2012 5 жыл бұрын

Thank you for this. Great video

@backstagepass.99 5 жыл бұрын

Thanks bro 🙏 🙏 🙏

@taliaedwards9939 3 жыл бұрын

Great video! Helped me fix my computer!

@HealMyTech1 3 жыл бұрын

You're welcome!

@ren49 3 жыл бұрын

what was your problem? I just built my first PC and it doesn't boot up. I just tested the PSU and it works fine so I think it may be the motherboard.

@omarsharif8381 11 ай бұрын

Thanks for good information.

@HawkFest 3 жыл бұрын

Thank you sir very well explained

@enriquearmasmusic 2 жыл бұрын

Thanks for sharing G

6 жыл бұрын

The hands with black gloves made this video a bit creepy.

@esatd34 4 жыл бұрын

Because that is a woman, and he looks like Muslim, he decided to hide her, i feel him

@buttersstotch2014 4 жыл бұрын

I'm going to guess that's his wife : ) Its always nice to have a spare set of hands!

@moeshickenyay 4 жыл бұрын

Yah really was wondering wtf was going on, thought maybe it was a mannequin, but then the hands moved?

@HWandW 4 жыл бұрын

I guess you’ve never been a stage/back stage hand before. They dress in all black. It seemed perfectly normal when I watched it.

@billkillernic 4 жыл бұрын

A part of her skin was exposed!!!! What an insult!!! That would rage Allah I guess :P

@mrbrown6421 2 жыл бұрын

I need a pair of those helping hands. I always run out of hands. Thanks!

@donjude9585 4 жыл бұрын

Nice job with teaching.... One thought for doing this alone (We all don't have a lovely assistant with us)..... Use an alligator clip on negative (black wire) side of multimeter and clip it to metal on PSU case grounding it - confirm a perfect ground by checking resistance/ Ohms test between clipped lead and any of the ground wire - (actually if you are having issues you can check all of the ground wires with this test).. Thank you, much appreciated.

@magnustorque5528 2 жыл бұрын

Great job !

@co0l 5 жыл бұрын

this tutorial helped

@Lucaeus 2 жыл бұрын

Thank you!

@bustillosbrandon100 3 жыл бұрын

My multimeter exploded durring the cable check. 😂😂 suggestion: tell them to not use a cheap ass multimeter 🤣

@sir.dave_ 3 жыл бұрын

🤣🤣🤣

@mahuubao 5 жыл бұрын

Excellent ...

@torquemadathetriple6636 5 жыл бұрын

Thank you my friend, your video was a great help. Very clear and well presented. Just one question though. Shouldn't we also be testing the 8-pin CPU power connector of the PSU?

@hassoon7687 3 жыл бұрын

yes that as well. There is schematic for it in your motherboard manual if you built a pc yourself. else you can find tons online and just cross check like this vid.

@ElCanalDelPadrino 2 жыл бұрын

Thanks a lot sir!!

@rampage3926 5 жыл бұрын

useful thanks

@jeauseradmin 3 жыл бұрын

Awesome Vid!

@LindaengelustrupBlogspot 3 жыл бұрын

Thank you! :-)

@surfernorm6360 2 жыл бұрын

Excellent video I learnd how to turn on PS without motherboard. Also very good picture of power plug pinouts and you even added the tolerance ranges for each pin Excellent. May I borrow your assistant hands i need some one to hold things when I am working. also nice touch zooming in on the power cord symbols. I also like that you were talking us through the tests so I new exactly where i was. Subbed and Like cheers

@Reptiliomorph 3 жыл бұрын

You're a legend thanks bro

@HealMyTech1 3 жыл бұрын

Happy to help

@shushuyu 10 ай бұрын

sorry if i missed it techy stuff is not realy my jam but i am trying to learn. maybe i didn't catch it but did you mention what we should do if the psu works but it restarts abruteply and consistently in weird times? for instance..when you did the testing if even ONE pin come out with a number too high or too low even though would this be a psu replacement?

@zafslm9688 6 жыл бұрын

Masha allah bohot acha video very good method to teach us about pwr supply thnx and shukran bhai

@orionobolon4380 Жыл бұрын

Thanks 👍 helped me trouble shoot

@m06een00 6 жыл бұрын

When you test the motherboard plug supplier, is it necessary to test all the wires of the same colour in one connector, eg all the red +5V wires. Surely if one red gives a correct reading then all the other reds will give the same as they are supplied by the same rail in the PSU. Likewise for yellow, +12V and orange, +3.3V. Wouldn't testing one yellow and one orange wire be sufficient? Also why is it necessary to test the mains voltage? It's what voltages come out of the connector plug that's important?

@sanketjadhav6129 5 ай бұрын

Thanx a ton🎉

@rollcanja 5 жыл бұрын

thanks!

@bernardthefourth 3 жыл бұрын

Thanks man.

@TheAzuritePerson Жыл бұрын

Luckily didnt blow a fuse but youve helped me with fixing a dead PC, thanks!

@navb0tactual Ай бұрын

Oh cool, I think my motherboard is dead. Thank you for the video, this has saved me from diagnostic fees. I love working on my own things.

@jordan3150 5 жыл бұрын

Thanks for this vid I was able to check my power supply it was ok but still no turning on computer so I started to mess around with it by plugging every thing in then using multimeter on that diode option and plug the multimeter into the green black wires then not just the power supply fan worked but the cpu fan as well then pressed the power button and the computer turned on. So thanks for showing me what I needed to do with the fan cos it helped with actually turning it on

@HealMyTech1 5 жыл бұрын

As long as it works, I'm glad for you!

@Draigon18 4 жыл бұрын

Thats so weird, to me(a noob)..why does this work?

@sscorp5761 3 жыл бұрын

Thank you brother, awesome video. I am getting all the right voltages but pin 12. No 3.3v! What pin 12 used for?

@jaqenhghar661 3 жыл бұрын

Very professional job on explaining this in detail along with safety procedures. I would assume this can be used to find out the values on a modular power supply's end (with no cables attached)?

@cbacronje7869 Жыл бұрын

Yip same procedure.

@day__breaker5994 5 жыл бұрын

Super...I understand this video 😘😘😘😘😘😘😘😘😘😘

@PoorMiners321 3 жыл бұрын

thats what i want to this video,best tutorial, thats why i am subscribe to your channel thanks for sharing

@multitechnicianonline 2 жыл бұрын

Great info

@lucassacul2012 6 жыл бұрын

Excellent that was what I was looking for, like knowing whether the power source worked or not. Thanks

@Davysguru 5 жыл бұрын

Who is the robber???😂😂😂

@rick2001uk 3 жыл бұрын

🤣

@Pera-Peric 3 жыл бұрын

Girl

@hassoon7687 3 жыл бұрын

I might be mistaken but that is probably his wife. Hence the covering. Nonetheless if it is in fact his wife tis quite adorable how she is supporting him both literally and figuratively

@meetleon9793 3 жыл бұрын

I AM DEAD 😂😂😂😂

@paysonfox88 Жыл бұрын

It's not a robber as you think so, it is a robber of his heart. That is waifu!