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3.3v light gone out - duet not responding

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Duet Hardware and wiring
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  • undefined
    Lachlan @Phaedrux
    last edited by 5 Sept 2024, 23:32

    @Phaedrux I was Shortening the wires on the motor, I was doing this by cutting them in the middle and then joining the new ends together (we do not have any of the terminal types the motor has so I had to do it this way.
    I have done a continuity test on each of the motor wires and they all appear fine.
    We had the duet before I worked for the company, and I have been here around 1 1/4 of a year, So probably a couple of years ago. If I am not mistaken we get our stuff from Aurarum.
    https://aurarum.com.au/
    Is the close up where the Buck converter is?
    Thanks
    Lachlan
    20240906_091537.jpg 20240906_091601.jpg

    undefined 1 Reply Last reply 9 Sept 2024, 11:35 Reply Quote 0
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      Phaedrux Moderator
      last edited by 6 Sept 2024, 22:26

      When you power the board via USB does it power up and respond?

      Z-Bot CoreXY Build | Thingiverse Profile

      undefined 1 Reply Last reply 10 Sept 2024, 22:58 Reply Quote 0
      • undefined
        droftarts administrators @Lachlan
        last edited by 9 Sept 2024, 11:35

        @Lachlan said in 3.3v light gone out - duet not responding:

        Is the close up where the Buck converter is?

        Yes. U2 is the 3.3V voltage regulator, U3 is the 5V regulator. See https://docs.duet3d.com/en/User_manual/Troubleshooting/Parts#voltage-regulators-1 for part numbers.

        I can't see any obvious damage, but they can fail without showing damage. It does look like there is some contamination on the main MCU chip's pins? Clean off anything that looks like it may be bridging the pins.

        de25b988-bcaa-4731-8ee1-1a88e3460e57-image.png

        Ian

        Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

        undefined 1 Reply Last reply 11 Sept 2024, 02:47 Reply Quote 0
        • undefined
          Lachlan @Phaedrux
          last edited by 10 Sept 2024, 22:58

          @Phaedrux The 5.5V light comes on, but my computer does not recognise it in device manager at all (nothing comes up).
          When I plug it in the mains only the VIN light comes on but no components respond.

          1 Reply Last reply Reply Quote 0
          • undefined
            Lachlan @droftarts
            last edited by Lachlan 9 Nov 2024, 02:48 11 Sept 2024, 02:47

            @droftarts Just cleaned it off. No joy.
            So U3 is the Mosfet on the buck converter? Are the Surrounding capacitors and Inductor also part of it like they are on other buck converters? Where would I find the Diode?
            Also how would I go about testing for components?

            undefined 1 Reply Last reply 11 Sept 2024, 06:03 Reply Quote 0
            • undefined
              dc42 administrators @Lachlan
              last edited by 11 Sept 2024, 06:03

              @Lachlan if the 3.3V LED is not on then perhaps something is overloading the 3.3V rail. Check whether any components get hot, in particular the SD card, wifi or Ethernet module, and main processor.

              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

              undefined 1 Reply Last reply 13 Sept 2024, 02:48 Reply Quote 0
              • undefined
                Lachlan @dc42
                last edited by 13 Sept 2024, 02:48

                @dc42 I plugged the board into mains power on the printer, The area near the VIN light and the microprocessors on the Extruder motor outlets were warm.
                I did a continuity test on the Extruder motor, only to find It had not been wired in the correct order. I rewired and on concluding the continuity test, I found that there is about 0.5 Ohm resistance on the motor wires.
                Previously the cable for the extruder motor were in a drag chain that was much too small for all the cables. I have since replace it with a wider drag chain and had to replace the heat cable.
                Is it possible that the incorrect order and/or the overly tight drag chain would cause a short like what I have experienced.
                Sorry for the long answers - very new to this stuff.
                Many thanks
                Lachlan

                undefined 1 Reply Last reply 13 Sept 2024, 06:26 Reply Quote 0
                • undefined
                  dc42 administrators @Lachlan
                  last edited by 13 Sept 2024, 06:26

                  @Lachlan wiring the motor phases incorrectly, or shorting them out, is quite likely to blow the corresponding driver on a Duet 2 but typically wouldn't damage anything else.

                  As we suspect that something is shorting out the 3.3V rail, it's normal that the diode close to the USB port would get warm. Are you sure that nothing else on the board is warm? Have you disconnected everything else and removed the SD card?

                  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

                  undefined 1 Reply Last reply 16 Sept 2024, 00:04 Reply Quote 0
                  • undefined
                    Lachlan @dc42
                    last edited by 16 Sept 2024, 00:04

                    @dc42 I pulled out the SD card and made sure everything is unplugged.
                    The only area that got warm is under the board where the motor microprocessors are. It got a little warm where the driver microprocessors are, but no where else.
                    When plug the board into the computer only the 5.5v light comes on, but the 5.5v light does not come on when plugged into the mains power.
                    Could there be something going on with the 5.5v rail as well as the 3.3v rail?
                    Thank you
                    Lachlan

                    undefined 1 Reply Last reply 17 Sept 2024, 13:00 Reply Quote 0
                    • undefined
                      droftarts administrators @Lachlan
                      last edited by 17 Sept 2024, 13:00

                      @Lachlan said in 3.3v light gone out - duet not responding:

                      When plug the board into the computer only the 5.5v light comes on, but the 5.5v light does not come on when plugged into the mains power.
                      Could there be something going on with the 5.5v rail as well as the 3.3v rail?

                      5V will be supplied by USB when plugged in, effectively bypassing the 5V regulator. That the 3.3V LED is not lit either means there is a short, or the 3.3V regulator (U2) has failed. It's also possible the 5V regulator has failed. When connected, does your PC complain that the USB device is drawing too much power?

                      Ian

                      Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

                      undefined 1 Reply Last reply 20 Sept 2024, 00:00 Reply Quote 0
                      • undefined
                        Lachlan @droftarts
                        last edited by 20 Sept 2024, 00:00

                        @droftarts No, the PC does not detect the Duet at all, I do not get any messages about drawing too much power.
                        many thanks
                        Lachlan

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