tachometer on fan not working

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  • ratdude747
    Black Sheep
    • Nov 2008
    • 17136
    • USA
    #1

    tachometer on fan not working

    my cpu cooler's tacometer is not working. pwm control does.
    it is a scythe sleeve bearing fan. tachomer reads 0 rpm. other fan reads 4500 rpm.

    what could be causing this?
    sigpic

    (Insert witty quote here)
    Tags: None
    • 370forlife
      Large Marge
      • Aug 2008
      • 3112
      • United States
      #2
      Re: tachometer on fan not working

      Could just be the software is not reading it right, or the rpm sensor in the fan went out.

        Comment

        • ratdude747
          Black Sheep
          • Nov 2008
          • 17136
          • USA
          #3
          Re: tachometer on fan not working

          probably #2

          i had 2 intel fans once (p3 slot-1 coolers). one tach worked, one didn't. i checked the temps in bio to confirm. btw, fan 2 was at 850 or 450 (ish), not 4500. my remembering skills failed at that one
          sigpic

          (Insert witty quote here)

            Comment

            • KeriJane
              Mac Enthusiast
              • Sep 2008
              • 681
              • USA
              #4
              Re: tachometer on fan not working

              Hi Raatdude...

              That particular fan runs really slow.

              Most motherboards have a threshold below which no RPM readings appear.

              Most likely the fan speed is below the threshold.
              Try disabling the fan speed control in BIOS so as to get full speed. Or changing the parameters may speed it up. It's in the PC Health section.

              If it bothers you, just get a faster fan.

              Have Fun,
              Keri
              The More You Learn The Less You Know!

                Comment

                • ratdude747
                  Black Sheep
                  • Nov 2008
                  • 17136
                  • USA
                  #5
                  Re: tachometer on fan not working

                  i connected it to the second fan port w/o a pwm pin and still no rpm.
                  sigpic

                  (Insert witty quote here)

                    Comment

                    • Wizard
                      Badcaps Legend
                      • Mar 2008
                      • 2296
                      #6
                      Re: tachometer on fan not working

                      Some boards have lower limit that creases to monitor RPM. Try to make mainboard to spin that fan faster and see if the monitor rpm working again, if so, put it back and don't worry about no-rpm issues.

                      I see this once in awhile.

                      Cheers, Wizard

                        Comment

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