1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Asus z170 Sabertooth S - Assist fans never turn off

Discussion in 'Asus UK' started by teamtd11, 30 Jul 2016.

  1. teamtd11

    teamtd11 *Custom User Title*

    Joined:
    31 Aug 2005
    Posts:
    2,267
    Likes Received:
    30
    Hi, Strange issue with my Asus Sabertooth z170 S motherboard. When I shutdown the PC now, the assist fans never turn off. When I power the computer back on I get a anti-serge warning, Bought a brand new power supply but the issue is the same.
    If after shutting down I turn the PC off at the wall, when I turn it back on again the next day all is okay, No anti-surge warnings.

    I have tried this with a 650W Cyonic by Seasonic AU-650x, and a XFX 1050W power supply.

    I have also reset bios to defaults with the onboard jumper.
    Bios is the latest version.

    Any Ideas? I have no issue with turning off at the wall on a night, its just strange.
     
  2. Will_ASUSUK

    Will_ASUSUK New Member

    Joined:
    20 Jun 2016
    Posts:
    28
    Likes Received:
    0
    Hi,
    Apologies you are having issues, have you tried turning off surge detection in the BIOS?
    Regards
     
  3. teamtd11

    teamtd11 *Custom User Title*

    Joined:
    31 Aug 2005
    Posts:
    2,267
    Likes Received:
    30
    Hi, Yes turning off surge protection in the bios stops the warnings on boots, and everything seams to work fine.
    Am I fine running the machine with this disabled?
     
  4. Will_ASUSUK

    Will_ASUSUK New Member

    Joined:
    20 Jun 2016
    Posts:
    28
    Likes Received:
    0
    Excellent, yes that is fine to run it without it on, sometimes it can be a bit sensitive. Regards Will.
     
  5. TheMadDutchDude

    TheMadDutchDude The Flying Dutchman

    Joined:
    23 Aug 2013
    Posts:
    4,061
    Likes Received:
    275
    For what it is worth, I think that it is a compatibility issue with the board and/or PSU. I have the Sabertooth Mark 1 in my current rig (for now) which portrayed a very similar issue to yours. Mine, however, would take anywhere from one to twenty (or more) quick power on/off cycles to just POST with a Corsair AX1200i. As soon as I swapped it for a Superflower 1200w unit, the issue disappeared immediately. The issue was still present, even when the surge protection was turned off in the BIOS. I thought it was just a misfortune on my half, but it wasn't.

    I now have the surge protection enabled (because I thought I'd try it) and it has not tripped once since then. I wish I knew more on the matter, but I think it really is as simple as a compatibility issue, which is likely to be down to your board and PSU combo. :(

    The only common thing I notice between your PSUs is that they are both made by Seasonic - XFX uses them as their OEM.
     
  6. teamtd11

    teamtd11 *Custom User Title*

    Joined:
    31 Aug 2005
    Posts:
    2,267
    Likes Received:
    30
    Thanks for this. I still see the issue with the PC needing to be turned off at the wall to stop the assist fans spinning. This could be it as everything was fine with a corsair TX750 but it was the loudest thing in the PC. So I swapped it out.
    Time to start selling these power supplies :wallbash:
     

Share This Page