Manually Test a (PSU) Power Supply With a Multimeter by Britec
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- Опубликовано: 16 июл 2024
- Manually Test a (PSU) Power Supply With a Multimeter by Britec
NOTE: This testing applies only to the standard ATX PSU, it does not apply to proprietary PSU's (ie: older Dell's ) which use a different pinout arrangement for their ATX connectors (non-standard).
20 and 24-Pin Connectors: The 24-Pin connector has an additional 4 pins attached to one end of the connector. The top 20-Pin section is electrically identical to the original 20-Pin ATX connector. Due to the additional connections the numbering sequence changes, so if you have a 24-Pin connection then make that adjustment when comparing with a 20-pin
+3.3v pins 1, 2, 11 (Orange wires)
+5V pins 4, 6, 19, 20, (Red wires)
+12V pin 10 (Yellow wires)
-5V pin 18
-12V pin 12
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I have just started my first PC build and when I was finished I plugged it in. It didn't work and I was told it was either the PSU or the Motherboard so I assumed it was the PSU, but before jumping to conclusions I did a bit of research and found this video.
I did everything and it worked so I looked at the wiring on the PC and noticed something was wrong and fixed it. The PC now powers on because of this video.
Thank you!
Thanks you for taking the time in letting me know you like the videos, its lovely comments like yours that drives me on to keep making helpful videos.
I couldn't find a paper clip anywhere in my house to save my life. LOL! In frustration, broke the closure end off of a safety pin and bam! my power supply fan came to life. It made me so happy. Thanks for such a friendly, easy-to-understand video. This is my first time using a multimeter, and I was able to test all my voltages.
Thanks for the support, glad you found the video informative, stay tuned for more videos.
My computer would not start today, Last night was running great. A computer help-site advised me to test my power supply, and referred me to a video that turned out to be a non-native-English speaker, was not well organized etc. Found this one, WAYYY better, very clear, and especially helpful were the small graphics showing the wire colors and voltages that popped up when needed. Very well done. There's a reason vids like this stay here for years, they are so well done and 'serviceable' that they continue to help folks long after they're posted. Thank you for taking the time to produce and share such a well-done video.
Great tutorial! Thank you for including that graphic, too. I was able to successfully test each port on my power with an analog multimeter.
Thanks - as someone who didn't know one end of the multimeter from the other, this was just what I needed!
Thanks so much for this video. You make it so simple and easy to follow, and the diagrams of the pinouts are very helpful. Thanks again.
Thank you Brian! You made this easy to follow.
I needed to test my power supply, specifically the number 8, gray wire, which is the Power Okay wire. It is supposed to have 5 volts; it has 4.8 volts. I suppose that is good enough.
The motherboard is an old Abit IP35-E. It will not boot with a Seagate, mechanical hard drive. It boots and runs fine with a solid state drive. I did some reading and surprise, this was a common problem with motherboards that have an IP35 chipset.
I need a power supply with more power! Specifically it needs more than 28 amperes on the 12 volt rail.
If only all of life's problems could be solved with shopping.
A happy April to you!
Wow, the first video I have seen where a person puts the PSU under load and uses a VOM. Thank you.
The specs call for all voltages to fall within 5% plus or minus of their rated voltage or 10% for the -12V line.
I've done PC building before and some hardware diagnostics (Memtest, Seatools etc) but I now got a couple of PSUs that I need to test. Just to echo the comments on here - it's very clear and well done how-to guide. Thanks for taking the time to record it :-)
Just what I needed. No American noise and hype. thanks bri.
I think it's very clear, concise, and I just did my testing of a suspected faulty PSU and the reading is great. i am using a micro-ATX PSU, as such, I don't have a tester other than my multi-meter. :)
Your welcome, thanks for the kind words.
@fixitdaz yeah will be doing full screen hopefully when I get me tripod and when I sort the work shop out.
@TimsComputerRepair Thanks mate glad you liked it.
Hey Britec, loving the new style videos with that hands on feel !!!. Keep up the awesome channel and keep the content coming. Thanks for all your hard work !!!. Al Reid
@fixitdaz yeah will be doing full screen hopefully when I get me tripod and when I sort the work shop out. Wont be to the summer I don't think.
Excellent,clear,concise, and simple to copy his actions in using a volt/ohm meter TY!!
Just watched this vid and have to say it is the most precise and helpful I've seen...big thanks...
I am only glad that the video helped you, thanks for the support.
I found this video very useful. I really don't understand all those negative comments. I'm all for constructive criticism but this guy went out of his way to explain something that will help a lot of of us diagnose problems with our psu. Keep up the good work
Thanks, you will always get negative people in this world, they have nothing better to do then look on RUclips and troll peoples content with all there great advise and they never make content themselves, strange that.
@@Britec09 What did you show in this video? How to connect a PC PSU so it can startup, and how to measure that voltage is present (under a very small load), it is a very limit test so to speak, but it may be very helpful in some cases, but not all.
The trolls you see are negative for a reason, and that is that you are doing things in a way that may lead to more damage than needed, especially if you take into consideration the target viewers of this video armatures that wants to fix their own PC, these often have no idea about what they are dealing with and the risk involved.
Excellent tutorial, this is exactly what I was looking for. Thanks so much!
First time I've heard where someone says to not put the paperclip in while the PSU is live.
Good safety advice!
Thanks for the kind words, glad I could help you out.
Your welcome Sam, have a great weekend.
Thanks Brian. Very useful. And Larkspeed's criticisms are good ones. Hope to see more in the future.
as per usual another great step by step for us dummies tutorials...Old but good thread. Thanks and keep them coming.
Can you use a hard drive with a molex connector if you don't have a fan with a molex connector? Can you tell me what the plus or minus range would be with the various voltages? How many devices should you hook up to be safe?
Reason I'm asking. I just did a motherboard switch. Case fan and power supply comes on. CPU fan is moving really slow then everything stops after a bit. The PSU was working fine just hours ago with another motherboard and the same components. Trying to figure out if it's the motherboard, CPU or power supply. I'm not even getting to the bios screen and I'm not getting any error beeps from the speaker. Thanks!
edit: isn't your -12 volt out of spec? You are at 11.03 and spec is supposed to be -11.4 to -12.6
Your tutorial is very helpful :) I can say this one is the best I could find so far.
bought one of the small 'fix all ' " Dr. Power " and was glad to see an alterative to check the results
Love the new hands on Videos Brian,Cheers Buddy.
Great idea to test PSU before starting any computer build, takes a load off my mind. Ha no pun intended.
Thanks so much :)
D
@Tuscopa Your welcome mate, its just a basic guide really.
Very helpful! Confirmed a suspected bad power supply, voltages were all over the place, some too high.
Very clear and informative. Thanks mate!
Thank you for teaching me about this Britec09!
that was an awesome video. I appreciate it as I am either having trouble with my psu or my motherboard. Will be running this test tomorrow.
Thanks, I almost bought one of those tester while I have multimeter, my Q? do I need to change PSU if reads less than 11V or 4V or how to know the unit is in good condition!
@fixitdaz hopefully when I get me tripod and when I sort the work shop out.i be able to do full screen...but it Wont be to the summer I don't think.
Clearly explained. Well organized. Thanks.
Another good tutorial - Thanks.
Great presentation.
Thanks
Yea, DO NOT push in that pin like that, you will widen up the connector pins and mess up the the connection with you motherboard.
You could just touch the surface of the female connector in the cable too. Don't have to plunge it in there so it sticks in tightly (and expanding the metal), just touching the metal contact is fine.
Thanks!
Simple & clear.
Thanks Britec. Very helpful.
Thanks, glad it helped you fix your pc
Britec tutorial is number 1. Thank you so much
another great vid by Britec. So helpful learning so much thank you
david goodwin glad I could help, have a great weekend.
Good tutorial, helped me out. Thank you!
I appreciate
in the world there are a lot of people know
but a not a lot of people want you to know what they know
so thanks you helped me I am from Syria
Very good video.Simple and clear.Thanks.
Thanks for the upload!
Great video. Helped me fix my computer to boot. Easy to understand too.
what does it mean when you get a negative symbol appear in front of the voltage reading, i DO have the correct mm probes touch ground and live on the psu btw
Very well done video!.
Thanks, it means a lot when people appreciate my videos.
Thank you for making this easy for us beginners :)
@drainocleanser If you have blown caps *capacitors* then these will need to be replaced.
Every video this guy make is so usefull. ty vm for giving from your time to make this videos make my life way easier. Unfortunately the PSU im trying to test right now don't have the power button on the back. What I can do?
very good the pop-up pictures gave a lot of useful information
Thanks Brian. How low a voltage should cause me to worry? For a pin listed as 3.3V I saw about 2.5V
great tutorial! learnt a lot from this, thanks for sharing :-)
Wayne Beeston glad you liked it Wayne
+Britec09 should the fan start up straight away? I just bought the psu but I don't have my other parts yet so I plugged it in and turned it on and the fan didn't start spinning. Is this normal?
+finlx some psu's need a load attached before they turn on and you see the fan spin....
+Britec09 My -5V does not have any reading, where do I go to fix it? thanks
+tebsum Bong -5V was used by the ISA slots. Are you even old enough to remember what an ISA slot is? lol
-5V was dropped from the ATX specs a long time ago (rev.1.2; completely removed in 2.01). There hasn't been a pinout for it in some time. Unfortunately some PSU suppliers/makers still list it. It should read zero if using one of those "PSU Testers."
Great video.
Thanks!
tested 3 old PSU's like this, they all had right voltage for every
color, but in practice none of the 3 could turn on a Dell tower. Two of
the PSU's were previously tested on a Gateway machine and didn't turn
it on, either; and furthermore, after swapping with a brand new PSU the
gateway machine was working fine. So I'm wondering if there's more
thorough testing of the PSU's that this tutorial leaves off.
You dont have to put the tester probe on a black ground wire, you can use the power supply metal housing (one of the threaded screw holes) so you dont have to juggle it . . . but test all the grounds first as well
great vid, thanks for your help! very concise and easy to understand, not too much extra information or blabbering on like some vids.
however, in the future, you might want to make sure the lighting/sunlight/window is behind you, rather than in front of you, because it kinda silhouetted the coloured connectors, making it hard to see which colours were which.
Awesome video. Very informative. One point though, when your showing the close up of the motherboard power connector block, a head light would have illuminated the colours better
would it be ok if this testing was done while the 24pin connector was still attached to the mobo?Would it still give proper readings on the multimeter?
Awesome vid, thanks mate
Great video there and good quality also....Thanks for this.
@highlinder1968 Good point....Always best to play it safe really. but then its the same with anti static wristband? where uses them? no one.
Very nice, thanks!
a website i found went by geography....u went by color...much more useful...thanx
Great video there Brian , always seem to use a bit of wire myself but it does have sheilding on it just inase I do hit it.
Absolutely awsome help brian,
Big thanku sir,,😊😊
I have a psu tester like the one you showed at the beginning of the video, but it has a LCD display and shows each voltage of each connector. Is this as good a method as using a multimeter? As it gives pretty much the same results, but it just a bit easier.
Hey guys. My pc had shut down a few days ago and I narrowed down the problem today. Everytime I plug in the 4-pin power socket on the motherboard for the cpu, the pc does not boot at all (no fans running etc). When I unplug the cpu 4-pin on the motherboard, everything is fine. The fans run at their at their normal speed (led and gpu). Obviously, there is no post since the cpu is unplugged. Did my cpu 4-pin power socket short circuit?
very helpful. thank you!
Thanks a lot. Just what I was looking for; simple and clear. U-shape clip could be shorter tho...
Thank you for the video. If the purple wire was testing + 4.39 volts dc would that be an issue? Thanks
Nice Job. Thank you!
Great vid. Brian. One question please.
If you put 2 12v ie. yellow wires together.
Does that make it a 24v.?
Thank you.
what if i have a fully blacked out cables, how do i find the ground?
Appriciate your time and effort in making these video's.allways verry clear and informative.A big help for people like me and theres no reason at all to be negative about any of your vidios....many thanks martome123
Thanks a lot mate! You are the best
What it sounds like is happening is either that your PSU can't deliver the current/wattage that your HP is asking for, or that the voltage is dropping when the PSU warms up. If you can learn how to measure voltage while the PC is running, you should see that the voltage slowly dips as the PSU warms up, OR when you start running lots of cpu/gpu intensive programs/games on the pc. Once the voltage dips too low, below a certain point, the whole PC might shut off.
this is a pretty old video but it still comes up when searching this problem so to anyone that sees this:
MAKE SURE you wrap the jump cable to power the supply on with some kind of electrical tape before inserting. Second, before jumping remove the AC Cable from the unit and make sure the switch is set to off. This is just a little common sense tip to not get a zap.
Nice video. I have the same multimeter, but with out the blue cover
Great stuff!! Cheers
What is the fan doing there, and how is it "creating a connection"?
Do you mean that it is needed to load the power supply?
And for safety it is a good idea to use a piece of heat-shrinking tube or electrical tape to insulate the paperclip.
I agree. Kind of janky to leave that giant loop of a paper clip hanging out there. What if you accidentally touch it to something else grounded in your vicinity? "Just be careful" isn't good enough - unless you like fireworks and replacing gear.
I'm using a 12v=600mA plug to run 3 normal 80mm case fans. The 3 fans only hit 150mA maxs "they are 12v" running fine wired up to a molex. I need more cooling for my laptop. The 3 usb fans rated at 5v 0.25A just don't give much cooling. is it safe? iv check the plug after a few hours and it's only slightly warm to touch with the fans working fine. i'm not close to the 600mA of the plug so im guessing its ok.
@wtbm123 Yeah they work OK for a cheap multimeter
This is a very useful video. The yellow wire on my molex is only around 6 volts. Will that damage my desktop? Thanks! God bless.
Thank you. Don't know why this would be voted down. Good info. I have a 700 watt I need to test after a MB fried last night. (fried while testing an older hard drive. )
I hope the other drives/PS survived.
If a person connects the inexpensive test device (instead of the paperclip) could the multi-tester be used to test the pins?
Seems this would be much safer than the hot paperclip exposed and ready for an accident.
hi great vid just one concern when you connect the green and black with the paper clip is it dangerous if you touch the clip with your hand or falls off while the power is on
my 12 volt rails are pulling around 12.9v's as read by my multimeter, with just the fan as the load. Does this bode well for my GPU? I've had weird issues lately with my GPU and thought maybe it was the PSU acting up. Moreover, the PCI-E 6+2 connectors are systematically melting where the female connectors are coated with plastic...
same question here mine were all low and pc wouldnt start there is screws inside to turn voltage up FYI I dont know what max power should be ? i was thinking 12.9 v