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    i think fan0 mosfed died.

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    • dc42undefined
      dc42 administrators
      last edited by

      Check the PCB version marked on it. Version 1.03 was the first version with a fan fuse.

      Duet WiFi hardware designer and firmware engineer
      Please do not ask me for Duet support via PM or email, use the forum
      http://www.escher3d.com, https://miscsolutions.wordpress.com

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      • weputundefined
        weput @A Former User
        last edited by

        @bearer this one definitely don't have.

        A Former User? 1 Reply Last reply Reply Quote 0
        • A Former User?
          A Former User @weput
          last edited by

          @weput the fuse is likely less important as long as Fan 1 works. But do take a closer look at TR1 after the clean up as indicated above.

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          • weputundefined
            weput @A Former User
            last edited by

            @bearer said in i think fan0 mosfed died.:

            it look fine.... but fan2 still doesn't move.

            20200526_153543.jpg
            20200526_153641.jpg

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            • A Former User?
              A Former User @weput
              last edited by

              @weput said in i think fan0 mosfed died.:

              it look fine

              i'd beg to differ, looks like a tiny hole in it, and given the other symptoms odds are it has failed, just less spectacularly.

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              • weputundefined
                weput
                last edited by weput

                well...

                maybe is time to think on a newer duet?

                fan1 had the heatsink fan on.. thermostatically controlled. Maybe that's why i didnt blew.

                fan2 had nothing on it.

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                • dc42undefined
                  dc42 administrators
                  last edited by dc42

                  Please clarify: does just fan 1 work, or do no fans work (which is what you said in your original post)?

                  Duet WiFi hardware designer and firmware engineer
                  Please do not ask me for Duet support via PM or email, use the forum
                  http://www.escher3d.com, https://miscsolutions.wordpress.com

                  weputundefined 1 Reply Last reply Reply Quote 0
                  • weputundefined
                    weput @dc42
                    last edited by

                    @dc42 said in i think fan0 mosfed died.:

                    does

                    FAN1 works. (currently set as tool 0 fan.)
                    FAN2 doesn't.
                    FAN0 is blown.

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                    • weputundefined
                      weput
                      last edited by

                      i just realized i wrote mosfed instead of mosfet.

                      (facepalm)

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                      • dc42undefined
                        dc42 administrators
                        last edited by

                        OK, so you have 2 failed mosfets.

                        Duet WiFi hardware designer and firmware engineer
                        Please do not ask me for Duet support via PM or email, use the forum
                        http://www.escher3d.com, https://miscsolutions.wordpress.com

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                        • weputundefined
                          weput
                          last edited by

                          FYI guys...

                          i managed to make fan2 work.. but somehow fan0 aint doing it...

                          also, when i was about to solder the self resetting fuse (vssa), after removing the soldered wire for the temporary pot... i checked continuity and it had continuity... so the old fuse was working.

                          yeah... very strange.

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                          • A Former User?
                            A Former User @weput
                            last edited by

                            @weput said in i think fan0 mosfed died.:

                            so the old fuse was working

                            i think i've seen dc42 suggest waitng a day or two to see if the self resetting fuse recovers - but i though you had trouble with the fans, not the VSSA fuse that is for the thermistor ground connection?

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                            • weputundefined
                              weput
                              last edited by

                              trouble with both.

                              i received the package (finally) with the spare parts.

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                              • weputundefined
                                weput
                                last edited by

                                my board is hardware version 1, so this is not a self reset fuse...

                                on the fan1 blown transistor,.. it seems i fucked up the board when cleaning/removing the old part.

                                😞
                                20200616_144136.jpg

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                                • A Former User?
                                  A Former User @weput
                                  last edited by A Former User

                                  @weput said in i think fan0 mosfed died.:

                                  it seems i f***ed up the board when cleaning/removing the old part.

                                  these things happen with too much heat, the copper becomes delaminated from the substrate.

                                  not the end of the world, we have all the files we need to find a workaround, the missing pad is a ground connection, so you could solder in the mosfet, and run a wire from the leg with no pad to any other ground pin

                                  37f385de-87d2-4d60-b660-ec171d403ce5-image.png
                                  (edit: fixed silkscreen on top of screenshot)

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                                  • weputundefined
                                    weput
                                    last edited by

                                    thanks m8.

                                    I was looking at the old pictures and notice the cooper was conected to the pin path... so i tried to add more thin until it made contact..

                                    not sure if it worked... im connecting the board now.

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                                    • A Former User?
                                      A Former User @weput
                                      last edited by

                                      @weput said in i think fan0 mosfed died.:

                                      not sure if it worked

                                      if not you can just add a short jumper wire to another ground pin (suitably sized for the current the fan needs)

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                                      • weputundefined
                                        weput
                                        last edited by

                                        @bearer said in i think fan0 mosfed died.:

                                        just

                                        it worked.

                                        🙂

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                                        • weputundefined
                                          weput
                                          last edited by

                                          honestly, i dont know how i fucked up the connector that bad... i just placed the soldering iron and used the suction thing ... added flux and repeat.

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                                          • A Former User?
                                            A Former User @weput
                                            last edited by A Former User

                                            @weput said in i think fan0 mosfed died.:

                                            i dont know how

                                            its a tiny pad and trace so it heat up quickly, and has very little surface area for the adhesive that weakens at high temperatures so care needs to be taken when working on such pads. (the fault current could also weaken the trace before you started working on it)

                                            pre heating the board helps a lot as you need less time to melt the solder and less risk of pulling a pad, but its fixed now and thats what matters in the end 👍

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