Sony STR-AV19 Left Channel weak when quiet?

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  • macjedimatt
    Member
    • May 2012
    • 21
    • USA
    #1

    Sony STR-AV19 Left Channel weak when quiet?

    I have a Sony STR-AV19 that works great when the music is on the loud side. But if things get quiet, I start to loose the left channel. It gets quiet and a little fuzzy sounding. It does the same thing no matter what the physical position of the volume knob is. It also seems to get worse if I have it running for a couple hours. I've had it taken apart and I don't see any visible damage. The service manual is available here:

    Does anyone have any ideas where I should start looking? The volume knob sounds clean, so I don't think it's the potentiometer.

    -Thanks
    Tags: None
    • CapLeaker
      Leaking Member
      • Dec 2014
      • 8146
      • Canada
      #2
      Re: Sony STR-AV19 Left Channel weak when quiet?

      compare the left channel to the right channel when its acting up. look with an oscilloscope on which stages of amplification things are normal or not. look also for bad solder joints and make sure that all voltage rails are good.

        Comment

        • jons
          Senior Member
          • Feb 2014
          • 59
          • Latvia
          #3
          Re: Sony STR-AV19 Left Channel weak when quiet?

          Check output relay - if their contacts oxidize enough to make some resistance between them then amp can act like this.

            Comment

            • R_J
              Badcaps Legend
              • Jun 2012
              • 9535
              • Canada
              #4
              Re: Sony STR-AV19 Left Channel weak when quiet?

              Try pushing the speaker switch a few times to clean the contacts to see if that helps, if not then a scope would be needed to trace and compare the audio signal.
              Try the tone and balance controls as well to see if they have any effect on the low audio.

                Comment

                • macjedimatt
                  Member
                  • May 2012
                  • 21
                  • USA
                  #5
                  Re: Sony STR-AV19 Left Channel weak when quiet?

                  I finally figured out what the issue was. The speaker protection relay has bad contacts. I've by-passed it for now and will eventually order a new one to replace it since cleaning the contacts didn't help at all.

                    Comment

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