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Seasonic Gutless fan fix?

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    #1

    Seasonic Gutless fan fix?

    I have a Seasonic PSU with APFC and the fan hardly turns, resulting in hot air coming out of the PSU exhaust. I've google this and it seems a common problem.

    If I could get the fan going a little faster, I'm sure a cooler PSU would result.

    I suspect the fan speed is triggered by some thermistor that's not working properly.

    Since the PSU is otherwise fine, couldn't I just reroute the fan wires to one of those fan speed controllers that I see on Ebay?

    The PSU was $100+ retail and I don't want it to fry itself.

    Ideas and comments welcome!
    Tags: None
    #2
    Re: Seasonic Gutless fan fix?

    Put it right across +12, so it runs 'full blast.' When you have the unit apart, it would also be the perfect time to oil the fan.

    Edit: Get rid of any craps in there as well.

    -Paul
    "pokemon go... to hell!"

    EOL it...
    Originally posted by shango066
    All style and no substance.
    Originally posted by smashstuff30
    guilty,guilty,guilty,guilty!
    guilty of being cheap-made!

    Comment

      #3
      Re: Seasonic Gutless fan fix?

      12V is too loud. It will sound like a jet engine. You need something between 5V and 9V.
      "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

      -Leonid Brezhnev (On the Yom Kippur War)

      Comment

        #4
        Re: Seasonic Gutless fan fix?

        Depends on the fan. I have fans where their rated 12v means "doesn't turn much at all".
        Originally posted by PeteS in CA
        Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
        A working TV? How boring!

        Comment

          #5
          Re: Seasonic Gutless fan fix?

          I sometimes make up my own temperature controllers with a trimmer pot, so you can adjust the target temparature.
          I love putting bad caps and flat batteries in fire and watching them explode!!

          No wonder it doesn't work! You installed the jumper wires backwards

          Main PC: Core i7 3770K 3.5GHz, Gigabyte GA-Z77M-D3H-MVP, 8GB Kingston HyperX DDR3 1600, 240GB Intel 335 Series SSD, 750GB WD HDD, Sony Optiarc DVD RW, Palit nVidia GTX660 Ti, CoolerMaster N200 Case, Delta DPS-600MB 600W PSU, Hauppauge TV Tuner, Windows 7 Home Premium

          Office PC: HP ProLiant ML150 G3, 2x Xeon E5335 2GHz, 4GB DDR2 RAM, 120GB Intel 530 SSD, 2x 250GB HDD, 2x 450GB 15K SAS HDD in RAID 1, 1x 2TB HDD, nVidia 8400GS, Delta DPS-650BB 650W PSU, Windows 7 Pro

          Comment

            #6
            Re: Seasonic Gutless fan fix?

            The fan could very well be bad, and is only turning when the thermistor tells it to "ramp up" the speed. I have a FSP PSU that's like this. At the lower "cool" voltage, the fan is stalled, and will only start turning when the PSU gets good and hot.
            Ludicrous gibs!

            Comment

              #7
              Re: Seasonic Gutless fan fix?

              Originally posted by mockingbird View Post
              12V is too loud. It will sound like a jet engine. You need something between 5V and 9V.
              I have a fan like that on the computer I use as a flight simulator. The fan ramping up like a jet engine gives the flight simulator added sound effects!

              Besides, this fan is cooling an Antec True Power 400 watt power supply....it needs all the cool air it can get! With new capacitors and cool air blowing, it sounds much better than the PowMax 400 that was originally in it!!!!!
              Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

              Comment

                #8
                Re: Seasonic Gutless fan fix?

                My PSU load tester has two Delta fans rated at 252 CFM each, so that's over 500CFM in total. It sounds A LOT like a boeing 727.
                I love putting bad caps and flat batteries in fire and watching them explode!!

                No wonder it doesn't work! You installed the jumper wires backwards

                Main PC: Core i7 3770K 3.5GHz, Gigabyte GA-Z77M-D3H-MVP, 8GB Kingston HyperX DDR3 1600, 240GB Intel 335 Series SSD, 750GB WD HDD, Sony Optiarc DVD RW, Palit nVidia GTX660 Ti, CoolerMaster N200 Case, Delta DPS-600MB 600W PSU, Hauppauge TV Tuner, Windows 7 Home Premium

                Office PC: HP ProLiant ML150 G3, 2x Xeon E5335 2GHz, 4GB DDR2 RAM, 120GB Intel 530 SSD, 2x 250GB HDD, 2x 450GB 15K SAS HDD in RAID 1, 1x 2TB HDD, nVidia 8400GS, Delta DPS-650BB 650W PSU, Windows 7 Pro

                Comment

                  #9
                  Re: Seasonic Gutless fan fix?

                  Originally posted by everell View Post
                  I have a fan like that on the computer I use as a flight simulator. The fan ramping up like a jet engine gives the flight simulator added sound effects!

                  Besides, this fan is cooling an Antec True Power 400 watt power supply....it needs all the cool air it can get! With new capacitors and cool air blowing, it sounds much better than the PowMax 400 that was originally in it!!!!!
                  Come and duel with me on BF Desert Combat El Alamein. You can have the American planes. I will shoot you down with that Arabic MIG using only my mouse and keyboard.
                  "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

                  -Leonid Brezhnev (On the Yom Kippur War)

                  Comment

                    #10
                    Re: Seasonic Gutless fan fix?

                    You could move the thermistor to something which becomes hotter (temperature probe helps)
                    NOTE THAT THE PSU PRIMARY HEATSINK SITS AT LIVE VOLTAGE SO DO NOT TOUCH IT WITH PSU RUNNING!!!!!!!

                    Good candidate for hotter than secondary side heatsink is primary side (but technically more dangerous)
                    The secondary side coils can get very warm too....
                    "The one who says it cannot be done should never interrupt the one who is doing it."

                    Comment

                      #11
                      Re: Seasonic Gutless fan fix?

                      If you can stick the thermistor on the inside of the secondary coil then you're all set. I strongly recommend against moving it to the primary side - not only will you compromise safety if the heatsink is live (some are, some aren't), but you will also disturb the control circuit.

                      The primary heatsink is either floating or connected to the primary DC bus negative for a reason - if it were connected to ground, all the interference generated by the switching transistors would go into the ground and disturb all equipment sharing the same ground bus.
                      Originally posted by PeteS in CA
                      Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                      A working TV? How boring!

                      Comment

                        #12
                        Re: Seasonic Gutless fan fix?

                        Find the thermistor for the fan controller and see it's PTC or NTC. If it's PTC, add a resistor in series with the thermistor. If it's a NTC thermistor, add a resistor in parallel with the thermistor. As for what value you should use for the resistor - well, that will take some experimentation. Probably a good idea to hook a potentiometer and play around with it until you get desired results.

                        Prior to doing all of this work, though, I suggest you check the fan and make sure it spins easily and is not starting to seize up.

                        Or if this seems like too much work, just change the fan with one rated for higher CFM.
                        Last edited by momaka; 05-05-2011, 09:18 PM.

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