Kenwood SW-38HT

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  • CraigR
    Badcaps Veteran
    • Dec 2013
    • 959
    • USA
    #1

    Kenwood SW-38HT

    I have a Kenwood SW-38HT subwoffer from a surround sound system that's not working. The person I got it from said they mistakenly left it on for 2 days. So they pulled it apart and seen the fuse was blown so replaced it with of course the wrong size (larger) and turned it on then said there was smoke and pulled the plug right away so that's when I got it. You can see in the picture some of the covering from the transformer is melted. I put a new fuse in but had the wires disconnected that went to the other boards from the transformer board and the fuse stayed good so I'm hoping it was unplugged in time. Anyway I am new to working on audio equipment and what I have checked so far is that all the caps "look" ok and I do not see anything burnt or any bad solder joints so I'm at a loss what to check next?
    Attached Files
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    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Kenwood SW-38HT

      Can you post the pictures of the whole chassis so I can see how all the boards are connected together?
      The thermal fuse inside the transformer may have blown open.
      Service manual:

      Download and post it on this thread.
      Last edited by budm; 03-28-2014, 12:43 PM.
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

        Comment

        • vinceroger69
          Badcaps Legend
          • Mar 2012
          • 6714
          • uk
          #3
          Re: Kenwood SW-38HT

          manual
          Attached Files

            Comment

            • CraigR
              Badcaps Veteran
              • Dec 2013
              • 959
              • USA
              #4
              Re: Kenwood SW-38HT

              I think maybe it might be the transformer I plugged it back in and tested for voltage on all three wires that come from it to go to the other board and got nothing.

                Comment

                • Longbow
                  Badcaps Veteran
                  • Jun 2011
                  • 623
                  • USA
                  #5
                  Re: Kenwood SW-38HT

                  No continuity through the primary winding...?...is the usual test.
                  Is it plugged in?

                    Comment

                    • CraigR
                      Badcaps Veteran
                      • Dec 2013
                      • 959
                      • USA
                      #6
                      Re: Kenwood SW-38HT

                      Thanks but was not getting any help so tossed it out.

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA
                          #7
                          Re: Kenwood SW-38HT

                          You should be able to check the the primary DCR of the transformer on pin 5 and pin 1 as shown in the service manual, may be the thermal fuse inside the transformer is blown.
                          @vince, thanks for the service manual.
                          Never stop learning
                          Basic LCD TV and Monitor troubleshooting guides.
                          http://www.badcaps.net/forum/showthr...956#post305956

                          Voltage Regulator (LDO) testing:
                          http://www.badcaps.net/forum/showthr...999#post300999

                          Inverter testing using old CFL:
                          http://www.badcaps.net/forum/showthr...er+testing+cfl

                          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                          http://s807.photobucket.com/user/budm/library/

                          TV Factory reset codes listing:
                          http://www.badcaps.net/forum/showthread.php?t=24809

                            Comment

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