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Old 5th November 2009, 10:33 PM   #1
Lumba Ogir is offline Lumba Ogir  Sweden
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Default Please!

Hi everyone,
how to simulate a fan (to fool the computer) on a 3 pin system fan connector (ground-+12V-sensor)?
Thanks.
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Old 5th November 2009, 10:49 PM   #2
MJL21193 is offline MJL21193  Canada
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Measure the DC resistance on the gnd/12V leads from the fan and match it with a fixed resistance maybe? Worth a try.
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Old 6th November 2009, 03:02 AM   #3
Gary P is offline Gary P
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Are you trying to get the computer to not give you the "CPU fan fail" warning at boot?

Look in the bios settings for a setting about CPU fan check and disable if possible.
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Old 6th November 2009, 05:52 AM   #4
dangus is offline dangus  Canada
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Please!
Bios settings, or use the speed signal from another fan in the system. Or use an oscillator to fake a signal.
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Old 6th November 2009, 07:55 AM   #5
Lumba Ogir is offline Lumba Ogir  Sweden
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Hi guys,
Quote:
Are you trying to get the computer to not give you the "CPU fan fail" warning at boot?
Exactly.
Quote:
Look in the bios settings for a setting about CPU fan check and disable if possible
That´s not an option in this custom-made BIOS/MoBo.

I once solved the problem with a resistor between sensor and ground. It does not seem to work this time.
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Old 6th November 2009, 09:09 AM   #6
stinius is offline stinius
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Hi

You will need a “Pseudo Fan” to fool the controller. The controller needs to see a square wave to “think” that the fan is running.

See July/August issue of Elektor page 17.

Link:

Cheers
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Old 6th November 2009, 09:21 AM   #7
Lumba Ogir is offline Lumba Ogir  Sweden
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dangus and stinius,
interconnecting the sensors of system fan and processor fan (which is active) would be a simple enough solution.
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Old 6th November 2009, 11:45 AM   #8
wwenze is offline wwenze  Singapore
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If you have an extra fan and your motherboard can use speedfan, just connect the extra fan and set speedfan to auto disable to fan after booting into Windows.

That's what I do anyway. My mainboard is also OEM with no option to disable CPU fan warning. And I have a Scythe Ninja to run fanless an undervolted A64 with.
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Old 7th November 2009, 09:06 PM   #9
Lumba Ogir is offline Lumba Ogir  Sweden
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Hi,
no success yet, fan speed control is very problematic these days...
Fan Speed Control is Cool! - Maxim
http://pdfserv.maxim-ic.com/en/an/AN1784.pdf
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Old 7th November 2009, 09:42 PM   #10
stinius is offline stinius
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Quote:
Originally Posted by Lumba Ogir View Post
Hi,
no success yet
Hi

What have you tried so far without success?

stinius
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