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How to test a faulty? computer Fan.
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- เผยแพร่เมื่อ 6 มี.ค. 2013
- How to test a computer fan.
You'll need a good multimeter, a 9V battery, a 9V battery connector and common sense (remember ESD precautions and be careful when testing live components!)
In this tutorial I use:
A 9V battery
The Extech EX330 Multimeter
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A 9V battery connector
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I picked up a bunch of fans (untested) from somebody that was throwing it away. I'll be able to use this method to test them. Thanks
Best of luck.
Hey thank you for that little tip on you I'm using a 9 V battery with the connector and hook in the wires up. I had 10 fans I needed to test. And your method worked perfect.
oh boy! your audio sounds like you're speaking from deep under the ground...
old video really helpful.
now im testing hundreds of refurbish laptop/pc fans.
Glad you found it useful.
thanks for the 6v test trick thats what I was looking for
Great, glad it helped! Thank you
Solid tute. Noyce 😉
I think you're connecting a 9v battery to a 5v rail. Usually in PC power systems, yellow=12v and red=5v. Usually excess voltage damages components, so you might want to check that
Thank you for noticing that, I was confused.
This doesn't apply to computer fans, where red = 12v, black = ground, and (in the specific case of this fan as wire colors might differ quite a bit) yellow is the tach signal.
additionally, since this is a 4 pin connector fan, the 4th blue wire is a fan control wire which lets the host (a computer) send signals to the fan to change rpm.
@@MrK1kk3r Thanks for the info and correction! How does this work with molex to 4 pin adapters? Does that mean they direct the yellow molex wire to the red fan pin?
Now is 10th October 2020 and this video help me, Thankyou very much, i really appreciate 👍👍👍
Glad it was of some help. cheers
next, how to test a faulty led ? connect battery to it and if its lit up, its not faulty. Good job.
Connect it the wrong way and you blew the LED. Congrats on a job well done. Point is to know how to test things without breaking them in the process. :)
Wow!! @xmenxwk You win the internet with that reply!! STFU
Sir thank you for uploading this video it is very helpful
Thank you, glad it worked for you.
how can i test the output in motherboard pin connector with the multimeter? to check if it is sending enough V ? my fan cooler spins ok with the battery
Can you measure current of the fan? in a series connection with the multimeter?
Microsoft recommends people to service there console when they do this fan failure has to be watched if the fan isn’t working and not doing what’s it’s supposed to it is fan failure
Is there any way to repair a shorted fan?
Thank you simple and good informative
I try everything on the video and it didn't work. Yesterday I disassemble the PS4 pro that was thrown in the garbage. Tested it it's completely dead. I use a 12v adapter still no spin. So im assuming it could be circuit tree in the fan that's fail. I just buy another. It's a powerful one. Nidec 12v 2.10A
Can you make a video to test the function of yellow and blue lines ? Such a test does not seem to be very comprehensive.
Thanks for the video
I ask you a query related to this topic:
- can you test the sys_fan connector on the motherboard?
- do you have any tutorial, to see how it is tested with a multimeter?
regards
sys_fan would be the same. Unplug it first from the main board then test. Of course make sure your computer is powered off when doing this.
Is it possible to test the fan without the battery ? Only with the multimeter
Thx fro sharing.
If I use OHM meter settings will it also show me if the motor is good or bad.
How to chech thx
Thank you, very simple and informative.
Why does the fan measure 6 volt instead of 12 volt
I have a fan on a led unit that needs replacing there's no sticker on the fan showing the voltage.. How can I find out voltage of fan so I can get replacement
I have a gpu fan that doesn't work when plugged into the card but works when powered with 9v battery, what could this be?😒 I have a sapphire r9 290 vapor-x
gpu has its own bios that controls its fan, also drivers control that too :V. Does it spin when you press the power button to turn on the PC - even for a second?
Thank you. You have saved my device
"If the fan was not working and u get 5 v. That means the fan isn't working" fucking genius
when i supply voltage, fan turns then stop then turns then stops, does that mean fan is bad?
What about resistance?
And what is the other two wires for, the yellow and blue, different speed?
There 4 wires for Pete's sake
Great question. The Black wire is GROUND (0V), The Yellow is 12+V, The Green is for Sense/Tach (indicates how fast the fan is running), and the Blue is for Control/PWM (tells the fan to speed up or down)
A 4-wire CPU (motherboard) fan is a standard brushless dc (BLDC) fan, but has four wires extending from the casing. Each of these wires serves a specific purpose. Note that Chassis and CPU fans may use either 3-pin or 4-pin power connectors. 3-pin connectors are usually used for the smaller chassis fans with lower power consumption, while 4-pin connectors are usually used by CPU fans with higher power consumption.
The simplest PC fan requires just two wires - one wire provides power (12V), and the next wire is ground (0V). In a 3-wire fan, the extra (third) wire is the ‘tachometer’ signal (Tacho) wire that indicates how fast the fan is running. Here, the fan speed is typically controlled by increasing or decreasing the voltage over the power wire, as in the case of a common 2-wire fan. However, the 4-wire fan is a little different as it has the fourth ‘control’ wire to input a signal to the fan that commands it to speed up or speed down. Simply, a 3-wire fan reports its speed, and a 4-wire fan lets regulate its speed by an external signal, usually coming from the motherboard.
Technically, a 4-wire fan is called as “4-Wire Pulse Width Modulation (PWM) Controlled Fan”. Intel developed connection standards for 4-wire fans.
battery trick is awesome, thank you.
you could use a 5V led strip connecter and plug it in into your 4-pin connecter it works! but put 5V+ in red and G in black
it is written 12V and 0.5A ,what do they mean !
Dumb question can it work for a car amplifier
Thanks for the tip!
What is the use of third wire ?
3rd wire to measure the speed of the fan.
Thanks for the information...
when i turn on my laptop fan is work till window load after that fan turn off what should i do..pls tell me
Your Operating system might not be communicating properly with the BIOS. Try booting from a known good OS and/or run the built-in fan diagnostics if available.
so my CPU fan header from my motherboard shows a 5 volt on the multimeter. My 4-wire pwm fan works when I plug it into an 4.3 volt batteries. But when I plug the 4 wires connectors back into the CPU fan header on my motherboard, my fan wont spin! I put my volt meter to check for voltage and it shows 5 volt but my fan won't spin! Can you please help? Thanks!
Boot to the BIOS and manually activate the fans to see if it works, and to make sure the OS is not the problem. If it works while manually activating it on the BIOS, then you know something's wrong with the OS thermal reporting settings.
I have a very similar CPU fan (AVC MODEL DA07020B12U) that has stopped working (I apply 12 V and it doesn't spin, but mechanically it spins fine, but it is very dusty). What I want to know is, when a fan like this fails, what exactly fails? Is there a fuse inside, which I have to tear off the label to get at? Does a resister go bad? Is there just a little integrated circuit inside? If that goes bad, perhaps replace that? Or could dust possibly ruin the circuit inside? Where could I find this out? By the way, correct answer is NOT "oh just get a new one". Yes, I will do that as last resort.
Verify the wiring to ensure you are putting the voltage where it should be.
If the fan developed a short in the winding it will not spin no matter what you do. Run a Continuity Test on the + and - cables. If OL shows, you got a short and will need to replace the fan.
What are the other wires on the fan for??
They are used to control the speed of fan
my notebook fan connected directly to 5 v stats for about 2 seconds and then shut of. And the loop starts over and over. On off all the time.
Is broken? is there a way to fix it?
Look at the voltage of the fan. You'll need at least 3/4 of the power to test it properly.
In this video the fan needed 12V but worked with just 9V. If the fan tests bad you'll need to get a new one. Can't fix.
ty
when i supply power to cabinet fan , it spins for half revolution and then stops. what might be the problem and how to solve it?
Either it's not enough voltage to make it run, the fan requires a "feedback" line, or it just went bad. Try to give it the same voltage as shown in your fan. If not, most likely it failed. Good luck.
thanks for the reply SechoDB. I tried giving same voltage and it didnt spin.
multimeter spoil ?
Thank you
Okay. How would you test further the fan if this is not the issue?
Not sure what "issue" you're referring to... When in doubt, get a replacement fan. They are not expensive.
Geez, man, exactly what you presented in the video. Actually, the quality silent PWM ones are expensive. Testing further the digital and analog components...
Thank you
so if the fan is working then the problem is in the motherboard? because i am facing a problem that the fan doesn't reach high speed, but when i connected it to external power supply it worked properly
Either the Board or the OS. Run the built-in Fan diagnostics if available. Check BIOS settings.
500mA is a quite high absorption for a fan :D
Probably not a good idea to use 9 v battery if it's a 5v laptop fan-two aa cells (3v ) should do.
Correct. The fan being tested here is 12V though.
@@JoseSanles he said if, btw where r u now?
THANKS
which running won't knowing doesn't im fan-psu? however 2 psu mine now any processing didn't. how to repair?
what are you saying lol
psu repair cuz both running doesnt
Looks like a pwm fan.
Dude, if the fan is shorted you still would have 0V on the +/- terminals.
Depending on your multimeter, a short should show as an OpenLoop (OL), not just 0V.
If it shows open loop, the multimeter is not working, so yeh
Also, I just stated that there will be zero potential between the terminals (a bit short hand though), not what the multimeter will show. Are you sure about OL? A short should definitely not show open loop, that would be very misleading I think
then fix the fan first ;)
Do you always...
Give SOUNDED UP.
Deafening Advice !