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12V on the 5V rail

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Duet Hardware and wiring
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  • undefined
    dc42 administrators
    last edited by 21 Mar 2020, 07:22

    You can feed the 3.3V into any endstop connector.

    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 21 Mar 2020, 21:53 Reply Quote 0
    • undefined
      Haggan90 @dc42
      last edited by 21 Mar 2020, 21:53

      @dc42 I connected 3.3V and nothing got hot.
      When I connected USB I got 4.4V in the 3.3V rail...

      ? undefined 2 Replies Last reply 21 Mar 2020, 22:55 Reply Quote 0
      • ?
        A Former User @Haggan90
        last edited by 21 Mar 2020, 22:55

        @Haggan90 said in 12V on the 5V rail:

        When I connected USB I got 4.4V in the 3.3V rail...

        after removing the 3.3v volt regulator? strange, please post a picture of the board?

        undefined 1 Reply Last reply 22 Mar 2020, 06:32 Reply Quote 0
        • undefined
          Haggan90 @A Former User
          last edited by 22 Mar 2020, 06:32

          @bearer I connected 3.3V to where the regulater output was.
          20200322_073622.jpg

          1 Reply Last reply Reply Quote 0
          • undefined
            dc42 administrators @Haggan90
            last edited by 22 Mar 2020, 07:00

            @Haggan90 said in 12V on the 5V rail:

            @dc42 I connected 3.3V and nothing got hot.
            When I connected USB I got 4.4V in the 3.3V rail...

            Remove the other blown chip too.

            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 22 Mar 2020, 07:33 Reply Quote 0
            • undefined
              Haggan90 @dc42
              last edited by 22 Mar 2020, 07:33

              @dc42 You mean the U11 / 74HCT02?

              undefined 1 Reply Last reply 22 Mar 2020, 09:44 Reply Quote 0
              • undefined
                dc42 administrators @Haggan90
                last edited by 22 Mar 2020, 09:44

                @Haggan90 said in 12V on the 5V rail:

                @dc42 You mean the U11 / 74HCT02?

                Yes.

                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 2 Replies Last reply 22 Mar 2020, 12:29 Reply Quote 0
                • undefined
                  Haggan90 @dc42
                  last edited by 22 Mar 2020, 12:29

                  @dc42 aha ok! I have to do that at work where we have a hot air solder gun

                  1 Reply Last reply Reply Quote 0
                  • undefined
                    Haggan90 @dc42
                    last edited by 25 Apr 2020, 08:32

                    @dc42 Hi!

                    Sorry for taking such long time for this, but now I have manage to replace the U2 and U11.
                    When I connect the Duet to USB I get a warning of high current cunsumtion on the USB port, and U2 get's really hot.

                    Do you have any slightest idea of what else could be broken?

                    1 Reply Last reply Reply Quote 0
                    • undefined
                      dc42 administrators
                      last edited by dc42 25 Apr 2020, 12:49

                      What else is getting hot? Start by checking the processor, SD card (if it is in the socket), and WiFi module.

                      Are you certain that you used the correct chip to replace U2? Different hardware versions of the Duet WiFi use different chips in that position.

                      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 26 Apr 2020, 08:25 Reply Quote 0
                      • undefined
                        Haggan90 @dc42
                        last edited by 26 Apr 2020, 08:25

                        @dc42 hi!
                        As far as I can nothing else get's hit then the U2. Here are the new components.
                        2020-4-26 10-27-58.jpg 2020-4-26 10-28-13.jpg

                        1 Reply Last reply Reply Quote 0
                        • undefined
                          dc42 administrators
                          last edited by 26 Apr 2020, 10:54

                          What part number did you use for the 3.3V regulator, and what hardware revision Duet board is it? I think you may have used the wrong regulator.

                          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 27 Apr 2020, 06:02 Reply Quote 0
                          • undefined
                            Haggan90 @dc42
                            last edited by 27 Apr 2020, 06:02

                            @dc42 Hi,

                            As voltage regulator I used a: AP7361C-33E-13
                            And as the U11 mosfet driver I used a : SN74HCT02PWR

                            1 Reply Last reply Reply Quote 0
                            • ?
                              A Former User
                              last edited by A Former User 27 Apr 2020, 06:24

                              looks like the board is a revision 1.03 board that uses a TC2117 which is not compatible with AP7361C-33E-13 but should could be compatible with AP7361C-33ER-13

                              9c692d57-91d2-49a8-bcac-d17ca85f8087-image.png

                              undefined ? 2 Replies Last reply 27 Apr 2020, 06:25 Reply Quote 0
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                                Haggan90 @A Former User
                                last edited by 27 Apr 2020, 06:25

                                @bearer Aw crap haha 😛
                                Might I have destroyed the PCB even more now?

                                ? 1 Reply Last reply 27 Apr 2020, 06:29 Reply Quote 0
                                • ?
                                  A Former User @Haggan90
                                  last edited by 27 Apr 2020, 06:29

                                  @Haggan90 not sure; i would guess u2 took the blunt of the force this time as well.

                                  you'll just have to remove it and see if the board still works with external 3.3v I guess (or wait for the correct part)

                                  But do double check it is a rev 1.03 board

                                  undefined 1 Reply Last reply 27 Apr 2020, 06:37 Reply Quote 1
                                  • undefined
                                    Haggan90 @A Former User
                                    last edited by 27 Apr 2020, 06:37

                                    @bearer Ok!
                                    Yeah, It is a V1.03 board.
                                    Is it possible that the Wifi Module and the SD card reader is OK or do I have to change one/both of them as well?

                                    ? 1 Reply Last reply 27 Apr 2020, 06:41 Reply Quote 0
                                    • ?
                                      A Former User @Haggan90
                                      last edited by 27 Apr 2020, 06:41

                                      @Haggan90 as I said I'm not sure, head isn't quite on the right way but I'm guessing you essentially fed -5v into the 3.3v output of the regulator which it didn't like.

                                      odds are if nothing else got warm the damage is contained, but as i said, remove the wrong regulator and test it with an external supply and you'll have the answer.

                                      1 Reply Last reply Reply Quote 0
                                      • ?
                                        A Former User @A Former User
                                        last edited by 27 Apr 2020, 07:04

                                        @bearer said in 12V on the 5V rail:

                                        but should be compatible with AP7361C-33ER-13

                                        @Haggan90 just clicked in my head the AP7361C doesn't specify if the tab is connected to v-out or gnd or anything at all; so I can't say for sure if it works.

                                        TC2117-3.3VDBTR is the full partno from the 1.03 schematic.

                                        undefined 1 Reply Last reply 27 Apr 2020, 07:11 Reply Quote 0
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                                          Haggan90 @A Former User
                                          last edited by Haggan90 27 Apr 2020, 07:11

                                          @bearer said in 12V on the 5V rail:

                                          TC2117-3.3VDBTR

                                          TC2117.PNG

                                          IS this the correct one?
                                          https://www.digikey.se/product-detail/sv/microchip-technology/TC2117-3-3VDBTR/TC2117-3-3VDBCT-ND/7065613

                                          1 Reply Last reply Reply Quote 0
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