Announcement

Collapse
No announcement yet.

12v switch to 2 fans murders the smaller fan

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    12v switch to 2 fans murders the smaller fan

    I have a small switch that is connected to 2 fans the long wire from the switch is connected to the fan + wire, at that same exact point another wire is soldered which goes to the other fan + wire

    So the 12v wire from the switch is split into 2 which connects to both fans

    The ground is also done the same way

    When i had it wired this way, both fans would work via the switch after disconnecting power and reconnecting the small 60mm fan would no longer work but the 80mm fan did, i replaced the 60mm fan and the same thing happened and neither will work

    When i solder 2 different wires to the 12v switch and connect them to the fans, both fans work without fail

    I am not sure exactly why this is occurring, the amperage requirements are slightly different for the fans

    #2
    Re: 12v switch to 2 fans murders the smaller fan

    i dont understand your description.

    Comment


      #3
      Re: 12v switch to 2 fans murders the smaller fan

      It sounds like the third fan is either shorted or otherwise drawing too much current in combination with the other two and dragging the 12v low. Either that or you wired something wrong.

      Edit: yeah, STJ is right, it's hard to understand exactly what you're doing. Are you trying to run 3 fans? 2 fans? Are they all 12v fans? How exactly have you wired them and the switch?
      Last edited by SteveNielsen; 07-21-2015, 08:44 PM.

      Comment


        #4
        Re: 12v switch to 2 fans murders the smaller fan

        Show us the pictures so we can see exactly how you wire them up.
        "The ground is also done the same way" and why do you have to hook up the ground wires to the switch?
        Your description of what you are doing is not very clear at all.
        Last edited by budm; 07-21-2015, 08:45 PM.
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
        http://s807.photobucket.com/user/budm/library/

        TV Factory reset codes listing:
        http://www.badcaps.net/forum/showthread.php?t=24809

        Comment


          #5
          Re: 12v switch to 2 fans murders the smaller fan

          This should help you. http://pcbheaven.com/wikipages/How_PC_Fans_Work/

          Comment


            #6
            Re: 12v switch to 2 fans murders the smaller fan

            I think it looks like this:
            Attached Files
            ASRock B550 PG Velocita

            Ryzen 9 "Vermeer" 5900X

            16 GB AData XPG Spectrix D41

            Sapphire Nitro+ Radeon RX 6750 XT

            eVGA Supernova G3 750W

            Western Digital Black SN850 1TB NVMe SSD

            Alienware AW3423DWF OLED




            "¡Me encanta "Me Encanta o Enlistarlo con Hilary Farr!" -Mí mismo

            "There's nothing more unattractive than a chick smoking a cigarette" -Topcat

            "Today's lesson in pissivity comes in the form of a ziplock baggie full of GPU extension brackets & hardware that for the last ~3 years have been on my bench, always in my way, getting moved around constantly....and yesterday I found myself in need of them....and the bastards are now nowhere to be found! Motherfracker!!" -Topcat

            "did I see a chair fly? I think I did! Time for popcorn!" -ratdude747

            Comment


              #7
              Re: 12v switch to 2 fans murders the smaller fan

              That doesn't show how the power source is wired and the fans are in series, they should be in parallel if it's a 12v source and they are 12v fans. There is also no reason to switch the negative.

              Comment


                #8
                Re: 12v switch to 2 fans murders the smaller fan

                yea it was a terrible explanation so basically in the drawing the 12v wire from psu is going to a 4 pin male connector, a female connector is inserted and on the other end is the fan 60mm

                i wanted to install another fan so i basically soldered wires to the male connector on the inside of the chassis to the corresponding wires

                the new 80mm fan works just fine but and when i insert the female connector it works as well

                after a power cycle the 60mm fan no longer works, i tried 2 more fans and the same thing happened

                when i solder 2 long wires directly from the psu to the new fan, both of them work fine
                Attached Files

                Comment


                  #9
                  Re: 12v switch to 2 fans murders the smaller fan

                  So the two black wires of both fan are connected to the pin of the connector that goes to the power supply return wire, the RED positive wires are connected together to another pin of the connector which is then connected to a switch. What kind of switch is this?
                  Show us the pictures of your setup.
                  Last edited by budm; 07-22-2015, 03:42 PM.
                  Never stop learning
                  Basic LCD TV and Monitor troubleshooting guides.
                  http://www.badcaps.net/forum/showthr...956#post305956

                  Voltage Regulator (LDO) testing:
                  http://www.badcaps.net/forum/showthr...999#post300999

                  Inverter testing using old CFL:
                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                  http://s807.photobucket.com/user/budm/library/

                  TV Factory reset codes listing:
                  http://www.badcaps.net/forum/showthread.php?t=24809

                  Comment


                    #10
                    Re: 12v switch to 2 fans murders the smaller fan

                    Can you post a picture of the actual switch, fans, and wiring? The drawings aren't very clear and confusing.

                    Comment


                      #11
                      Re: 12v switch to 2 fans murders the smaller fan

                      Yes if it an AC switch with a neon light it most likely will not work. If needs to be a 12 DC switch with a led light.

                      Comment


                        #12
                        Re: 12v switch to 2 fans murders the smaller fan

                        What happen if you bypass the switch terminals with wire (leave the switch in place)?
                        And what DCV do you get on the red and black wires of the fans when it is not working?
                        Last edited by budm; 07-22-2015, 04:08 PM.
                        Never stop learning
                        Basic LCD TV and Monitor troubleshooting guides.
                        http://www.badcaps.net/forum/showthr...956#post305956

                        Voltage Regulator (LDO) testing:
                        http://www.badcaps.net/forum/showthr...999#post300999

                        Inverter testing using old CFL:
                        http://www.badcaps.net/forum/showthr...er+testing+cfl

                        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                        http://s807.photobucket.com/user/budm/library/

                        TV Factory reset codes listing:
                        http://www.badcaps.net/forum/showthread.php?t=24809

                        Comment


                          #13
                          Re: 12v switch to 2 fans murders the smaller fan

                          Originally posted by keeney123 View Post
                          Yes if it an AC switch with a neon light it most likely will not work. If needs to be a 12 DC switch with a led light.
                          that's not true, you just wont get any light from it.

                          Comment


                            #14
                            Re: 12v switch to 2 fans murders the smaller fan

                            Originally posted by SteveNielsen View Post
                            That doesn't show how the power source is wired and the fans are in series, they should be in parallel if it's a 12v source and they are 12v fans. There is also no reason to switch the negative.
                            The negative wiring in my picture was hypothetical. That wasn't where it will return to exactly. LOL.

                            But, the description sounded just like that for the positive.
                            ASRock B550 PG Velocita

                            Ryzen 9 "Vermeer" 5900X

                            16 GB AData XPG Spectrix D41

                            Sapphire Nitro+ Radeon RX 6750 XT

                            eVGA Supernova G3 750W

                            Western Digital Black SN850 1TB NVMe SSD

                            Alienware AW3423DWF OLED




                            "¡Me encanta "Me Encanta o Enlistarlo con Hilary Farr!" -Mí mismo

                            "There's nothing more unattractive than a chick smoking a cigarette" -Topcat

                            "Today's lesson in pissivity comes in the form of a ziplock baggie full of GPU extension brackets & hardware that for the last ~3 years have been on my bench, always in my way, getting moved around constantly....and yesterday I found myself in need of them....and the bastards are now nowhere to be found! Motherfracker!!" -Topcat

                            "did I see a chair fly? I think I did! Time for popcorn!" -ratdude747

                            Comment


                              #15
                              Re: 12v switch to 2 fans murders the smaller fan

                              His drawing shows the fans in parallel, as they should be. What I wonder is what is the four pin connector going to? +12v and ground? If so then why is the switch connected to another +12v source? If he's getting +12v from the 4-pin connector then the switch belongs between the +12v at the connector and the two +12v leads to the fans. The ground goes directly to the negative leads for both fans.

                              Comment


                                #16
                                Re: 12v switch to 2 fans murders the smaller fan

                                Originally posted by stj View Post
                                that's not true, you just wont get any light from it.
                                Would it not depend on if the light is in series or parallel?

                                Comment


                                  #17
                                  Re: 12v switch to 2 fans murders the smaller fan

                                  Originally posted by SteveNielsen View Post
                                  His drawing shows the fans in parallel, as they should be. What I wonder is what is the four pin connector going to? +12v and ground? If so then why is the switch connected to another +12v source? If he's getting +12v from the 4-pin connector then the switch belongs between the +12v at the connector and the two +12v leads to the fans. The ground goes directly to the negative leads for both fans.
                                  Should it not be just measure with a meter to see what one gets and then connect it up correctly?

                                  Comment


                                    #18
                                    Re: 12v switch to 2 fans murders the smaller fan

                                    Per his drawing the two FANS are connected in parallel so all he has to do is to measure the DCV between the red and black wires of the FANS to see what he gets.
                                    Never stop learning
                                    Basic LCD TV and Monitor troubleshooting guides.
                                    http://www.badcaps.net/forum/showthr...956#post305956

                                    Voltage Regulator (LDO) testing:
                                    http://www.badcaps.net/forum/showthr...999#post300999

                                    Inverter testing using old CFL:
                                    http://www.badcaps.net/forum/showthr...er+testing+cfl

                                    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                    http://s807.photobucket.com/user/budm/library/

                                    TV Factory reset codes listing:
                                    http://www.badcaps.net/forum/showthread.php?t=24809

                                    Comment


                                      #19
                                      Re: 12v switch to 2 fans murders the smaller fan

                                      maybe one fan draws more current and the connector is shit.

                                      Comment


                                        #20
                                        Re: 12v switch to 2 fans murders the smaller fan

                                        Well I hope he will follow through with all of our request, I think he may have high resistance between the 12V power supply output and the junction where the two red wires are tied together or high resistance on the Ground wire to the power supply return.
                                        Never stop learning
                                        Basic LCD TV and Monitor troubleshooting guides.
                                        http://www.badcaps.net/forum/showthr...956#post305956

                                        Voltage Regulator (LDO) testing:
                                        http://www.badcaps.net/forum/showthr...999#post300999

                                        Inverter testing using old CFL:
                                        http://www.badcaps.net/forum/showthr...er+testing+cfl

                                        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                        http://s807.photobucket.com/user/budm/library/

                                        TV Factory reset codes listing:
                                        http://www.badcaps.net/forum/showthread.php?t=24809

                                        Comment

                                        Working...
                                        X