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    Duet 2 wifi - 3.3v failure

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    • espenborundefined
      espenbor
      last edited by

      I experience a 3.3v failure on my Duet2 wifi (v1.04)
      There is no light in the +3v LED, and when measuring the voltage on a 3.3v pin it shows only about 0.5v.

      The failure is however (for me) a bit strange. The board might start up normally, but after short time use it freezes and the 3.3v drops. (down to about 0.5v).

      I suspect the 5v to 3.3v regulator (U2) being the "problem-child" ... but I'm not shure.

      In a desperate attemt to come around the problem, I tried to supply 3.3v from an external source (via one of the 3.3v pins) - but the effect is the same. The voltage is drawn down to about 0.5v. So someting is shorting - with some resistance - to GND.

      Has anyone experienced similar failure?

      1 Reply Last reply Reply Quote 0
      • Phaedruxundefined
        Phaedrux Moderator
        last edited by

        When and where did you purchase your product?

        Is this a new board? Did it ever work?

        Can you post some close up photos of the board, particularly the U2 chip?

        Is it the same when powered via USB as when powered by VIN?

        Z-Bot CoreXY Build | Thingiverse Profile

        espenborundefined 1 Reply Last reply Reply Quote 0
        • espenborundefined
          espenbor @Phaedrux
          last edited by

          The board is bauht on ebay, and is most likely a clone i'm affraid. .... and probably with low-quality components.
          It has been working perfectly for about a year.
          It's all the same when powered via USB.
          20210805_122422_1.jpg

          dc42undefined 1 Reply Last reply Reply Quote 0
          • kb58undefined
            kb58
            last edited by kb58

            An easy test is to unplug everything except power, power up the board, and see if the 3.3V rail drops again. If it stays good, start plugging in things one at a time (except steppers) until you find the troublemaker. If it remains bad, then yes, it's something on the board itself.

            Scratch-built 350mmx350mm coreXY, linear rails, ballscrews, 3 Z axis, Duet3 6HC, v3.3, Tool Board v1.1, BondTech LGX + Mosquito hot end

            espenborundefined 1 Reply Last reply Reply Quote 1
            • dc42undefined
              dc42 administrators @espenbor
              last edited by

              @espenbor it's also worth checking whether any components are getting hot, in particular the 3.3V regulator chip, the SD card and the WiFi module.

              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

              espenborundefined 1 Reply Last reply Reply Quote 0
              • espenborundefined
                espenbor @kb58
                last edited by

                @kb58 Thanks for your simple, yet brilliant, advice!
                Pulled out everything, and the board worked fine. Put back one plug at the time and tested ..... and there it was - the X-Stop 😮
                Turned out to be the small end-switchboard with only a couple of resistors and caps. Replaced the board and everything works perfectly 👍 🙂

                kb58undefined 1 Reply Last reply Reply Quote 0
                • kb58undefined
                  kb58 @espenbor
                  last edited by kb58

                  @espenbor said in Duet 2 wifi - 3.3v failure:

                  @kb58 Thanks for your simple, yet brilliant, advice!
                  Pulled out everything, and the board worked fine. Put back one plug at the time and tested ..... and there it was - the X-Stop 😮
                  Turned out to be the small end-switchboard with only a couple of resistors and caps. Replaced the board and everything works perfectly 👍 🙂

                  Glad that I could help. So I'm half way there; I'm already considered simple, now I just have to work on the brilliant part...

                  Scratch-built 350mmx350mm coreXY, linear rails, ballscrews, 3 Z axis, Duet3 6HC, v3.3, Tool Board v1.1, BondTech LGX + Mosquito hot end

                  1 Reply Last reply Reply Quote 0
                  • espenborundefined
                    espenbor @dc42
                    last edited by

                    @dc42 Thank you for your quick response and your advice - it's really appreciated 👍
                    As you se it turned out to be an end-switch board causing the problem .

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