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    Duet won't boot problem

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    • A Former User?
      A Former User
      last edited by

      any guide to rework of a QNF chip will do, but you will need proper preheating as the board is 2oz copper, and has 4 layers where 3 are most ground planes.

      Part is a A4403GEUTR

      mkrsjakundefined 1 Reply Last reply Reply Quote 0
      • A Former User?
        A Former User @mkrsjak
        last edited by A Former User

        @mkrsjak said in Duet won't boot problem:

        I took a microscope and the u3 is indeed damaged.

        could be worth noting it may be covered by the manufacturers warranty if the board is less than 6 months; unless its caused by a short in wiring or other external factors.

        mkrsjakundefined 1 Reply Last reply Reply Quote 0
        • mkrsjakundefined
          mkrsjak @A Former User
          last edited by

          @bearer The board is more than 1 year old. I thought we have EU warranty 2 years,but apparently not.

          A Former User? 1 Reply Last reply Reply Quote 0
          • A Former User?
            A Former User @mkrsjak
            last edited by A Former User

            @mkrsjak said in Duet won't boot problem:

            I thought we have EU warranty 2 years

            that could be something to ask your vendor about; I would have consumer protection rights if purchased locally even if the manufacturer says 6 months but I can't speak to your local rules; and it would be a matter for the vendor, not the manufacturer.

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            • mkrsjakundefined
              mkrsjak @A Former User
              last edited by

              @bearer said in Duet won't boot problem:

              A4403GEUTR

              I found this one, seems to be within fast shipping reach.
              https://www.tme.eu/at/en/details/a4403geutr-t/voltage-regulators-dc-dc-circuits/allegro-microsystems/

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              • A Former User?
                A Former User
                last edited by

                Looks like the correct one. (but you will need a hot air station, a preheater/hotplate and some good flux as well)

                mkrsjakundefined 2 Replies Last reply Reply Quote 0
                • mkrsjakundefined
                  mkrsjak @A Former User
                  last edited by

                  @bearer said in Duet won't boot problem:

                  ut you will need a hot air station, a preheater/hotplate and some good

                  Have hotair, no preheat and really doing this the first time.

                  A Former User? 1 Reply Last reply Reply Quote 0
                  • mkrsjakundefined
                    mkrsjak @A Former User
                    last edited by

                    @bearer are the other 2 numbers important? 4403T XXXX YYYL ? cause there are many versions with different X and Y

                    A Former User? 1 Reply Last reply Reply Quote 0
                    • T3P3Tonyundefined
                      T3P3Tony administrators
                      last edited by T3P3Tony

                      @mkrsjak said in Duet won't boot problem:

                      4403T XXXX YYYL

                      The A4403 datasheet is here:https://www.allegromicro.com/~/media/Files/Datasheets/A4403-Datasheet.ashx

                      ;
                      The part numbering specifically
                      ecff334d-3018-4d61-adde-bbf116ce1e59-image.png

                      www.duet3d.com

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                      • mkrsjakundefined
                        mkrsjak
                        last edited by

                        ok, will buy and hopefully fix it, will post the result. thank you all for the outstanding help!

                        1 Reply Last reply Reply Quote 0
                        • A Former User?
                          A Former User @mkrsjak
                          last edited by A Former User

                          @mkrsjak said in Duet won't boot problem:

                          no preheat and really doing this the first time.

                          just be carefull with the surrounding parts, shield with kapton or alu tape (don't take the paper backing off the alu tape, it makes a mess (when very hot))

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

                            @mkrsjak said in Duet won't boot problem:

                            are the other 2 numbers important?

                            to add on Tonys reply; usually the last few numbers/letters refer to packageing, both in terms of which package it is (qnf, qft, bga sop etc) and how its packaged, tape, tray, tube etc; and the details are usually in the datasheets. (I posted the variant that is commonly available as "cut tape" in low quantity)

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                            • mkrsjakundefined
                              mkrsjak
                              last edited by

                              @bearer said in Duet won't boot problem:

                              QNF

                              I was something else wrong with the board. The U3 gets fried again, even with no connections except the power IN.
                              I will buy a replacement, but really not see a point buy from duet with only 6months of warranty. This should be fixed in general.
                              Even shoes and heavily wearing products have 2 years. Shame.

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

                                Sorry to hear you've had an unfortunate hardware failure and were unable to resolve it. The warranty provided can be reviewed here: https://www.duet3d.com/warranty

                                Unfortunately you're out of the warranty period it would seem. However, we may be able to provide you with a refurbished board at a reduced price on exchange. Please contact roland@duet3d.com to inquire about current availability.

                                Z-Bot CoreXY Build | Thingiverse Profile

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