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    short circuit on out 2, or maybe bad heater.

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

      @Seliv said in short circuit on out 2, or maybe bad heater.:

      Blinking the blue diode

      That is the Vin led, so if disconnecting the heater resolves the blinking both the mosfet on the output and the heater have failed unfortunately.

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      • Selivundefined
        Seliv
        last edited by

        so it's best not to use this input now, switch the bed with ssr to Out 0, and leave Out 2 empty? Its a new board, maybe 2 months 😜

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        • Selivundefined
          Seliv
          last edited by

          in fact, when I plugged in the first heater, it heats up immediately and cannot be stopped. So 100% mosfet ahh

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          • A Former User?
            A Former User
            last edited by

            you could remove the sd card or disconnect the ribbon cable to a raspberry pi to rule out config issues but sounds like something has given up the magic smoke.

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            • Selivundefined
              Seliv
              last edited by

              @bearer said in short circuit on out 2, or maybe bad heater.:

              you could remove the sd card or disconnect the ribbon cable to a raspberry pi to rule out config issues but sounds like something has given up the magic smoke.

              Im using it without pi, ohh god so what can I do now? ;/ all the time red light is on, as if he wanted to heat all the time.

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              • Phaedruxundefined
                Phaedrux Moderator
                last edited by

                so you've removed the SD card from the Duet and the heater still powers on as soon as power is applied?

                Z-Bot CoreXY Build | Thingiverse Profile

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                • Selivundefined
                  Seliv
                  last edited by

                  I unplugged all the cables and left only the power to verify. Outs 2 and 3 are burning all the time: / I'm guessing there must have been a short circuit and they went down. Is there any chance of rescue? e.g. get what I need to solder so that I can pass it to an electrician and take care of it?

                  photo 4.jpg

                  if it wasn't for the fact that it is an IDEX motherboard, I didn't really have any problem, but it is for a double X drive and I am already having a problem. šŸ˜•

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                  • Tim N.undefined
                    Tim N.
                    last edited by Tim N.

                    I also think that the MOSFETs are broken. If your solder skills are not to bad and you have an N-Channel MOSFET with specs like 40V 20A lying around, then even a non SMD type will fit onto the pads (without the large surface of the MOS). You dont even need an additional heatsink if your R_ds_on is not to large. I would recommend less than 50mΩ.

                    I had an issue with a short circuit in a heater (or between two), causing similar problems. I fixed a board like described - and works again perfect!
                    Downloading the Schematics (if you have KiCAD) will help if you are unsure about which Mosfet belongs to which output. But here it seems obvious.
                    Good luck!

                    Duet 2 Wifi on Ender 3 (2019) // Duet 2 Wifi on Tronxy X5SA-500 Pro // (shared Printer: Duet 2 Wifi on Flash forge creator Pro)

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                    • Selivundefined
                      Seliv
                      last edited by

                      Im trying to find a good mosfet in Poland, but I cant. I only see a large one just like it: https://allegro.pl/oferta/atp216-tl-h-n-channel-power-mosfet-50v-35a-23m-5910866100

                      its a good one?

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                      • Phaedruxundefined
                        Phaedrux Moderator
                        last edited by

                        Do you see any damage to chips on the board? Can you get a good quality photo?

                        Z-Bot CoreXY Build | Thingiverse Profile

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                        • Selivundefined
                          Seliv
                          last edited by

                          yea sure. I didnt see any damage, all mosfets on motherboard and other connectors are good for me.

                          photo 8-min.jpg photo 9.jpg photo 10.jpg

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

                            Don't need kicad, only pdf and interactive html BOM for the duet 3 on the duet3d github so far

                            Selivundefined 1 Reply Last reply Reply Quote 0
                            • Selivundefined
                              Seliv @A Former User
                              last edited by

                              @bearer so what I can see from this documents, its AOD4184A for mosfet for out1-3. I need to change it, and it will work, probably... 😜

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