Question Problems with fans - motherboard issue?

[NeedSomeHelp18]

Hi guys,
My case is Corsair 460X and it comes with 3x12V DC fans.
They are connected to motherboard as fan 2/3/4.

I also have a PWM fan 140mm on top of my case and a bequiet CPU fan.

Recently I have noticed that in BIOS - I cant control any of my fans anymore.

DC fans only work in PWM mode (full speed -3 at front of my case). When in DC mode, they all go to 0RPM and won't spin at all.

PWM fans are stuck at same RPM and can't be controlled either. Isn't that strange? I tried other software to set the speeds but none of these worked.
I remember I could set a curve for those (in older BIOS version) but this feature is now gone. Do you think it might be some problem with BIOS? Im running out of ideas now...

Spec:
X370 MSI pro carbon
Ryzen 3600
Fans - 4 Corsair fans - 3x120 and 1x140


Anyone has idea how to control those bloody fans? Thanks

 

[Paperdoc]

Those fans do operate on 12 VDC (max) voltage supply. But the names can confuse. Older fans with THREE wires and 3 holes in their connectors are called "Voltage Control Fans" (sometime skipping the "Control"). The newer 4-pin design are called PWM Fans. I believe what you have all are 4-pin PWM fans.

Now to an odd detail. In the manual for that mobo you will find on p. 35 that the CPU_FAN and PUMP_FAN1 headers are set by default to use PWM Mode. BUT all the SYS_FAN headers are set to VOLTAGE Control Mode by default, and that needs to be changed for your PWM fan type. So for EACH of the SYS_FAN headers used for your case fans, go to its configuration screen and, at upper left, change to PWM. When done, back out to the Main Menu then go to the System Settings Menu (p. 46). There choose Save & Exit (p. 53) and there choose Save Changes and Reboot.

I expect fully your CPU cooler has PWM type fan also, but that header already is set to PWM Mode by default.

 

[NeedSomeHelp18]

Those fans do operate on 12 VDC (max) voltage supply. But the names can confuse. Older fans with THREE wires and 3 holes in their connectors are called "Voltage Control Fans" (sometime skipping the "Control"). The newer 4-pin design are called PWM Fans. I believe what you have all are 4-pin PWM fans.

Now to an odd detail. In the manual for that mobo you will find on p. 35 that the CPU_FAN and PUMP_FAN1 headers are set by default to use PWM Mode. BUT all the SYS_FAN headers are set to VOLTAGE Control Mode by default, and that needs to be changed for your PWM fan type. So for EACH of the SYS_FAN headers used for your case fans, go to its configuration screen and, at upper left, change to PWM. When done, back out to the Main Menu then go to the System Settings Menu (p. 46). There choose Save & Exit (p. 53) and there choose Save Changes and Reboot.

I expect fully your CPU cooler has PWM type fan also, but that header already is set to PWM Mode by default.

Thank you for your reply!
Yeah like I said, 2 of them are PWM only. Its the CPU fan and 140mm fan on top of my case.

The test is definitely DC Control (not PWM).
co-9050082-ww that's the code of these case fans. On Corsair website it says - operating voltage 7-12V. However, when I try change voltage in BIOS - they still go at 0RPM in DC mode.

I followed the steps you have sent about mobo manual, but that's exactly how my setup is.


Any other ideas why I can't Control those fans?

 

[Paperdoc]

In BIOS Setup for those fan headers you can alter the default "fan curve" by dragging the four points of it to your own choices for speed at certain temperatures. Your lowest speed settings at the lowest temps may be too low. In Voltage (DC) Control Mode (for 3-pin fans) setting to 5 VDC (40%) or less may allow the fan to stall and not re-start. In PWM Mode (4-pin fans) this value may be less, but you still can set it so low the stall happens. Try raising the minimum speed for each header. What SHOULD happen at start-up is that every fan starts at full speed and then (5 to 15 sec) slows down to what is needed when very cool, but does NOT stall.

 

[NeedSomeHelp18]

In BIOS Setup for those fan headers you can alter the default "fan curve" by dragging the four points of it to your own choices for speed at certain temperatures. Your lowest speed settings at the lowest temps may be too low. In Voltage (DC) Control Mode (for 3-pin fans) setting to 5 VDC (40%) or less may allow the fan to stall and not re-start. In PWM Mode (4-pin fans) this value may be less, but you still can set it so low the stall happens. Try raising the minimum speed for each header. What SHOULD happen at start-up is that every fan starts at full speed and then (5 to 15 sec) slows down to what is needed when very cool, but does NOT stall.

Ya that's what I said in my first post. I can't do fan curve anymore due to BIOS update. This mobo support 3rd gen ryzen and BIOS is very cut down from the orginal one. It looks like basic bios - no fan curve, just all I can do it set voltage. I know how to do this, like I said - I did this in the past. Whatever I do - they won't spin at all... Or at max in PWM. Very weird. I have tried to set event 12V and still no fan spin... Its either max at PWM or 0 at DC mode...

 

[Paperdoc]

It is very odd that a BIOS Update gave you such a limited situation. Check carefully what BIOS veresion you have ionstalloed, and specifically whether it is the right one for YOUR mobo. Check with Tech Support at NSI to help verify you have the right and most BIOS. IF they say it's all good and that is just how it goes, ask whether you can revert to an earleir BIOS that did have those features, bearing in mind the particular CPU chip you have in your system.