Help monitor audio gxw-15 subwoofer

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  • exceptional
    New Member
    • Aug 2023
    • 4
    • UK
    #1

    Help monitor audio gxw-15 subwoofer

    Have a problem with one of my gxw-15 subwoofers. When pluging in power socket it shows power is ok (red LED), but when trying to turn it on it turns iff immediately (can hear relay clicking sound). Cause i have working second subwoofer i tried replacing several boards. So for now i can say power board is causing this problem. There are no visible damaged element on it. I wrote to Monitor audio and they sent me all schematics. What i have found is defective capacitor C535(short circuit), but after changing it ...same behavior.
    Measured output FETs, diodes. Seems everything is fine...
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    • R_J
      Badcaps Legend
      • Jun 2012
      • 9514
      • Canada
      #2
      Re: Help monitor audio gxw-15 subwoofer

      If C535 was shorted, you may have an open R508 that supplies the AUX supply. Check your AUX voltage and also the VCC voltage

        Comment

        • exceptional
          New Member
          • Aug 2023
          • 4
          • UK
          #3
          Re: Help monitor audio gxw-15 subwoofer

          R508 is ok.D507 too. Checked them. Will check aux voltage and VCC.

            Comment

            • dobrykamil
              Senior Member
              • Jun 2013
              • 61
              • UK
              #4
              Re: Help monitor audio gxw-15 subwoofer

              What about that swollen cap next to D528? Think it's on the +5V rail which is also used by that black relay.
              Last edited by dobrykamil; 10-18-2023, 01:15 PM.

                Comment

                • exceptional
                  New Member
                  • Aug 2023
                  • 4
                  • UK
                  #5
                  Re: Help monitor audio gxw-15 subwoofer

                  Thanks guys! I really missed that capacitor near D528. It was damaged too. Changed it and everything started to work!

                    Comment

                    • GriffDeLaGriff
                      New Member
                      • Dec 2023
                      • 2
                      • Norway
                      #6
                      I have the same subwoofer with the same behaviour. I should see if I have the same problem. Was it actually only that swollen cap?

                        Comment

                        • GriffDeLaGriff
                          New Member
                          • Dec 2023
                          • 2
                          • Norway
                          #7
                          So mine shows the exact same behaviour. But cant see any fault on that or adjacent caps.
                          4 Photos

                            Comment

                            • dobrykamil
                              Senior Member
                              • Jun 2013
                              • 61
                              • UK
                              #8
                              I have now joined the club. Trying to fix back plate with clicking issue. In my case, 5VDS is present and has correct, +5V value, but once I manually turn sub on, it drops to +2-3V like something was drawing too much current for standby smps to handle with.Does anyone have service manual for this particular model?
                              Thanks in advance.

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