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    No wifi as the U3 blew

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    Duet Hardware and wiring
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    • jay_s_ukundefined
      jay_s_uk @Stout
      last edited by

      @stout yea, thats U3

      Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

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      • Stoutundefined
        Stout
        last edited by

        When googling it seems to be a quite common problem that the U3 blows. So I am curious why it suddenly happened after using the printer almost 24/7 for a year without changing anything?

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        • Stoutundefined
          Stout @jay_s_uk
          last edited by Stout

          @jay_s_uk said in No wifi as the U3 blew:

          Your only real options are supplying 5v to the board via the external header, staying connected via USB or replacing U3

          So correct me if I'm wrong. I could solder a wire from the 5V external header directly to the USB connector pad and then have a working wifi connection?

          jay_s_ukundefined 1 Reply Last reply Reply Quote 0
          • jay_s_ukundefined
            jay_s_uk @Stout
            last edited by jay_s_uk

            @stout no need to solder any wires, the external 5v supply is linked to the internal system. You just need to change a jumper and then add a 5v supply
            https://duet3d.dozuki.com/Wiki/Power_Wiring#Section_5V_power

            Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

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            • Stoutundefined
              Stout
              last edited by Stout

              @jay_s_uk said in No wifi as the U3 blew:

              @stout no need to solder any wires, the external 5v supply is linked to the internal system. You just need to change a jumper and then add a 5v supply
              https://duet3d.dozuki.com/Wiki/Power_Wiring#Section_5V_power

              Hmmm.. so there's no way to bridge +5V internally to the USB port, let's say from the 5V "always on" fan? If an external power supply is needed then I can as well use the USB cable. But the USB cable is at the front of the printer and disturbing with risk braking the port.

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              • jay_s_ukundefined
                jay_s_uk
                last edited by

                @stout you can use a USB cable to supply the 5v. If its not working with the USB cable then you have more issues with the board

                Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

                Stoutundefined 1 Reply Last reply Reply Quote 0
                • Stoutundefined
                  Stout @jay_s_uk
                  last edited by Stout

                  @jay_s_uk said in No wifi as the U3 blew:

                  @stout you can use a USB cable to supply the 5v. If its not working with the USB cable then you have more issues with the board

                  Yes, I'm using a USB cable now and it's working but what I wanted to do was to hook up power to the backside of the USB- ort internally from the board, and my thought was If it was possible to use a wire from the "always on" fan directly to the USB VBUS pad on the PCB?
                  alt text

                  jay_s_ukundefined 1 Reply Last reply Reply Quote 0
                  • jay_s_ukundefined
                    jay_s_uk @Stout
                    last edited by

                    @stout there is no 5v power available on the board because the U3 has blown.
                    Where are you expecting to find 5v?

                    Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

                    Stoutundefined 1 Reply Last reply Reply Quote 0
                    • Stoutundefined
                      Stout @jay_s_uk
                      last edited by Stout

                      @jay_s_uk said in No wifi as the U3 blew:

                      @stout there is no 5v power available on the board because the U3 has blown.
                      Where are you expecting to find 5v?

                      I don't know but the fan sockets are supplying 5V, right?

                      jay_s_ukundefined 1 Reply Last reply Reply Quote 0
                      • jay_s_ukundefined
                        jay_s_uk @Stout
                        last edited by

                        @stout the fans are supplied from U3 or external 5v power, i.e. USB or an external 5v supply.
                        So again, where are you expecting to find 5v on the board if the 5v buck converter is blown?

                        Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

                        Stoutundefined 1 Reply Last reply Reply Quote 1
                        • Stoutundefined
                          Stout @jay_s_uk
                          last edited by

                          @jay_s_uk said in No wifi as the U3 blew:

                          @stout the fans are supplied from U3 or external 5v power, i.e. USB or an external 5v supply.
                          So again, where are you expecting to find 5v on the board if the 5v buck converter is blown?

                          Is it possible to connect an external 24-5V buck convertor from the PSU to the USB?

                          The hole idea is to get rid of the external USB cable or an extra external power source.

                          jay_s_ukundefined 1 Reply Last reply Reply Quote 0
                          • jay_s_ukundefined
                            jay_s_uk @Stout
                            last edited by

                            @stout yes, you can connect a buck converter to the 5v external connector.

                            Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

                            Stoutundefined 1 Reply Last reply Reply Quote 0
                            • Stoutundefined
                              Stout @jay_s_uk
                              last edited by Stout

                              @jay_s_uk said in No wifi as the U3 blew:

                              @stout yes, you can connect a buck converter to the 5v external connector.

                              Then the problem would be solved and I have a working wifi as nothing has happened. I have a couple of buck converters laying around so I'll give it a try.

                              Thanks for you support jay!

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                              • Stoutundefined
                                Stout
                                last edited by Stout

                                Just to clear things out from my head. The external 5V socket give power to the board as the USB port does?

                                jay_s_ukundefined 1 Reply Last reply Reply Quote 0
                                • jay_s_ukundefined
                                  jay_s_uk @Stout
                                  last edited by

                                  @stout yea

                                  Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

                                  1 Reply Last reply Reply Quote 1
                                  • Stoutundefined
                                    Stout
                                    last edited by

                                    Just a follow up...

                                    I applied a buck converter to the external 5V power and the wifi is working again as nothing has happened.

                                    So I'm pleased that I asked for help as I probably would not think of getting the power from the external 5V. It was easier than I thought to fix it.

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