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Sys Fan 1 plug problem.

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April 4, 2010 9:37:02 PM

I have my front case fan connected to the motherboard slot "SYS FAN 1"


The front case fan has LED lighting. The LED Light lights up when I plug it into the motherboard SYS FAN 1, but the fan blade doesn't turn. Infact it's moving slowly. Making one slight movement every 1 second. Almost like it's not getting enough power.

What is the issue with this? I just got a new motherboard three days ago and I just noticed this problem.

More about : sys fan plug problem

April 4, 2010 9:37:57 PM

Just on a side note, I tried plugging my side case fan into the exact same "SYS FAN 1" slot. Same thing happened. The fan just chugged a long real slowly like it's out of gas.
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a c 299 V Motherboard
April 4, 2010 10:29:10 PM

Hi newcomer and welcome to the Toms' hardware forum.

What case do you have?
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April 4, 2010 10:38:04 PM

saint19 said:
Hi newcomer and welcome to the Toms' hardware forum.

What case do you have?



Hey thanks.

I have an HAF 932 case.

I just recently swapped out my old motherboard (G31T-LM2) for a new motherboard(Gigabyte 890GPA).

I didn't have this problem when using my old motherboard.



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a c 299 V Motherboard
April 4, 2010 11:05:21 PM

Ok.

I think that this fans have the options to connect it directly to the PSU with a molex connector. Check this part, because my TT V9 also have the same front fan with LED an is connected directly to the PSU and not to the mobo.
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April 4, 2010 11:12:45 PM

saint19 said:
Ok.

I think that this fans have the options to connect it directly to the PSU with a molex connector. Check this part, because my TT V9 also have the same front fan with LED an is connected directly to the PSU and not to the mobo.



Yes when I plug it into the PSU it works just fine. It's that one sysfan 1 plug that doesn't work.
When I connect to the top fan to the PWRFAN plug works fine. Same with the rear fan connecting to SYSFAN 2.

It's weird because I didn't have this issue with my previous motherboard.
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a c 299 V Motherboard
April 4, 2010 11:19:45 PM

It's really weird, the LED fan use more power, but don't have sense that don't works fine, BUT the problem isn't the mobo because the other two fans work fine. So, I think that the fan needs more power and the connector of the mobo can't supply that power.
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April 5, 2010 1:12:00 AM

saint19 said:
It's really weird, the LED fan use more power, but don't have sense that don't works fine, BUT the problem isn't the mobo because the other two fans work fine. So, I think that the fan needs more power and the connector of the mobo can't supply that power.



I think you may be right. The front fan is a 230mm fan with LED while the side fan is a 230mm no LED.


When plugged into the port the front fan LED lights up but fan don't spin. When I plug the side fan into the same port it doesn't spin either.

Does it take more power to spin a 230mm fan?
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a c 217 V Motherboard
April 5, 2010 1:21:48 AM

I think the issue may be that the MoBo is looking for a return rpm signal from the 3rd wire and I'm thinking perhaps the 3rd wire powers the LED on this particular fan ?

Checked your BIOS fan control settings ?
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April 5, 2010 3:13:53 AM

JackNaylorPE said:
I think the issue may be that the MoBo is looking for a return rpm signal from the 3rd wire and I'm thinking perhaps the 3rd wire powers the LED on this particular fan ?

Checked your BIOS fan control settings ?



I used both the front fan(has LED) and the side fan (No LED) and they both don't spin.

I checked the bios and it shows the fan as being there but at 0 RPM.
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a b V Motherboard
April 5, 2010 3:18:21 AM

Are the motherboard connector and the fan's connector both 3 pin?
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April 5, 2010 4:09:43 AM

EXT64 said:
Are the motherboard connector and the fan's connector both 3 pin?



The motherboard connector is 4 pin and the fan connector is 3 pin.
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a b V Motherboard
April 5, 2010 11:50:43 AM

Do you know if that connector is a PWM only, or a PWM or Voltage controlled header?
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a c 217 V Motherboard
April 5, 2010 9:06:03 PM

tuesday0108 said:
The motherboard connector is 4 pin and the fan connector is 3 pin.


I'm thinking two pins used for fan spinning and 3rd for LED .... meaning MoBo looking for signal on speed which it's not getting cause 3rd wire doing LED
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April 6, 2010 5:36:13 PM

EXT64 said:
Do you know if that connector is a PWM only, or a PWM or Voltage controlled header?




I am not sure what PWM means. How do I find out?
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April 6, 2010 5:37:26 PM

JackNaylorPE said:
I'm thinking two pins used for fan spinning and 3rd for LED .... meaning MoBo looking for signal on speed which it's not getting cause 3rd wire doing LED



Hmm, am I only supposed to plug a 4 pin to 4 pin? The 4 pin on the mobo has 4 pins, but it has a little notce that allows 3 pins to fit in (error proof method)
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a b V Motherboard
April 6, 2010 9:59:11 PM

4 Pin plugs are PWM, or Pulse Width Modulation. The other method is voltage control (3-pin).

Quick Run down of the wires:
PWM:

1-12V in (constant, supplies power)
2-Ground
3-PWM signal in (sets speed depending on duty cycle)
4-Speed signal out (gives RPM of fan)

Voltage control:

1-Variable voltage in (controls fan speed and supplies power)
2-Ground
3-Speed signal out (RPM)

(Note, these aren't in the correct pin order, I was too lazy to look that up).

Most 4 pin motherboard headers are designed so they can do both. In the BIOS, where fan control is, there often is a setting for PWM control, voltage control, or auto. If not, it may automatically select or be only one or the other for each port.
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a c 217 V Motherboard
April 9, 2010 2:14:38 AM

I have 3 wire fans on my HS and BIOS will not control them.....PWM fan upgrade in the works.
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