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Zyxel WiFi VDSL VMG1312-b30b dsl port off

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    Zyxel WiFi VDSL VMG1312-b30b dsl port off

    Dear all,

    I am experiencing troubles with my wifi zyxel router VMG1312-b30b

    DSL port is off, DSL cable isnt detected.
    WiFi, Ethernet ports are working well, GUI accessible.

    After inspection of the box is obvious, that resistors R8, R16 are damaged/burned. Unfortunatelly, I am not able to find electronic schematic so I dont know the resistance.

    Could anyone help me with identification of SMD R8, R16 please ? These are next to DSL (RJ-11)and Ethernet(RJ-45) ports, close to H2001dg.

    Also, could you help me with identification of GA1 which is parallel to DSL port ?

    Pictures are attached.

    Thank you in advance.
    Attached Files

    #2
    Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

    I would make an educated guess that R14 is the same as R8 and possibly R16.
    GA1 looks like a diode to me. Does it measure like one ?

    Comment


      #3
      Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

      ga1 is a spark gap and should meter open-circuit.

      Comment


        #4
        Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

        Originally posted by stj View Post
        ga1 is a spark gap and should meter open-circuit.
        Thank you.

        Right, I did measure open circuit in both directions, so it might be ok ? Or is there anything else what I could test/measure here ?

        For education purposes, is there a way how to decode the color code/strip on it and find out the exact model ?

        Comment


          #5
          Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

          400v
          Attached Files

          Comment


            #6
            Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

            Originally posted by stj View Post
            400v
            Thank you very much.

            Comment


              #7
              Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

              Another broken part - could you help me with identifiacion please ?

              SMD diode HD1, HD2: O8W 4X - unable to find on google

              Have you seen it before ?
              Attached Files

              Comment


                #8
                Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

                MM5Z10V if it's a letter "O"
                MM5Z4V3 if it's numeric "0"

                Comment


                  #9
                  Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

                  Originally posted by stj View Post
                  MM5Z10V if it's a letter "O"
                  MM5Z4V3 if it's numeric "0"
                  Amazing
                  How did you decode the diode ?

                  Comment


                    #10
                    Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

                    https://www.badcaps.net/forum/showthread.php?p=507366

                    Comment


                      #11
                      Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

                      Originally posted by stj View Post
                      MM5Z10V if it's a letter "O"
                      MM5Z4V3 if it's numeric "0"
                      An idea how to determine whether is this 10V or 4,3V ?
                      0 and O looks similar

                      Comment


                        #12
                        Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

                        desolder a working one and stuff it on a zener tester.

                        Comment


                          #13
                          Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

                          Right. After desoldering the working one I measured Uz=9.36 V
                          My new 10V zener diode has got Uz=9.6V.
                          Is that suitable replacement part ?

                          Comment


                            #14
                            Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

                            close enough.
                            zeners are only acurate to the last 5% usually anyway.

                            Comment

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