AMD Motherboards - AB350 Pro4 - Can't turn off fans

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AB350 Pro4 - Can't turn off fans

Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=10592
Printed Date: 29 Jan 2025 at 8:39am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: AB350 Pro4 - Can't turn off fans

Posted By: Fefolino
Subject: AB350 Pro4 - Can't turn off fans
Date Posted: 03 Jan 2019 at 1:26am

Hi all,
I have got a problem,
I have a AB350 Pro4 and I can't turn off my fans
I tried making custom curve setting them at 0% until 50 C but they still continue spinning.
Some users told me to switch from PWM to DC mode but I can't find how to help me
I have 4 pin fans with 4 pin splitters
Can you help me please?
Thanks! :)

Replies:

Posted By: garych
Date Posted: 03 Jan 2019 at 1:56am

You can't turn off the PWM fan with a curve.
The only chance you with this motherboard is to get an adapter to make it a 3 pin fan and connect it to CHA_FAN1 header, where it will get detected as DC mode fan, that way you should be able to turn it off with a curve.

Posted By: garych
Date Posted: 03 Jan 2019 at 2:03am

nvm, got wrong board highlighted, but still you can only use cha_fan2 and cha_fan3 with a 3-pin fan in order to turn it off by setting a curve.

Posted By: Fefolino
Date Posted: 03 Jan 2019 at 2:08am

Ok, thanks! What if I detach - or cut - the 4th pin, the one of PWM?

Posted By: Fefolino
Date Posted: 03 Jan 2019 at 2:08am

I mean on the cable of the splitter obv, not on the motherboard

Posted By: garych
Date Posted: 03 Jan 2019 at 2:26am

If you can do that without permanent damage to the splitter, then go for it.

Posted By: garych
Date Posted: 03 Jan 2019 at 2:31am

I hope those are not CPU cooler fans, as you don't want CPU to not have a spinning fan, and your motherboard will most likely throw an error if you won't have any fan connected to the CPU fan header.

Posted By: Fefolino
Date Posted: 03 Jan 2019 at 6:26pm

garych wrote:

I hope those are not CPU cooler fans, as you don't want CPU to not have a spinning fan, and your motherboard will most likely throw an error if you won't have any fan connected to the CPU fan header.

Those are case fans and MAYBE cpu fans
My mobo doesn't throw an error if I haven't any fan connected to the CPU fan header lol, I can tell you this because the first time I assembled this pc I forgot the cpu fan and it started normally... I was installing drivers on Windows, I watched temps, 50 C... And realized that I forgot the cpu fan lol

BTW I think I can detach the 4th pin without breaking the splitter, I'll try thanks!