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Humming noise in Harmon Kardon AVR 110

There is a humming noise coming from each speaker (5). The noise can be heard with the volume low and no input to the reciever.

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  • rcivilpe Jan 30, 2008

    unplugged all cables and hum continued. unplugged each speaker one at a time and hum continues.

    i then plugged the power cord into a two prong cord and no help.

  • rcivilpe Jan 30, 2008

    i disconnected all the cables and the hum was still there. I did not replace them until after i checked all the speaker connections

  • rcivilpe Jan 30, 2008

    the surge protector "grounded" light is green for what that is worth.

    could the problem be with the reciever?

    What's with the all caps?


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I have a similar issue, except the hum only occurs for 4-5 minutes after powering up the unit. The level of hum is unaffected by the volume control, but is greatly reduced by the mute. The hum is on all channels. Looking at the schematic, there are only a few stages of amplification between the volume IC and the mute - all share the same regulated +/- 15 volt supply. My bet is that either the +15 or -15 volt bulk storage cap is going bad on my HK AVR110.
When I have time, I will open it up and use my vintage scope to confirm my diagnosis

Posted on Aug 20, 2010

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On what cd dvd ? cheak cable 1st rca swap out

Posted on Jan 29, 2008

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  • nick helpap
    nick helpap Jan 30, 2008

    u change rca inputs change with new cable ?

  • nick helpap
    nick helpap Jan 30, 2008

    IS IT GROUNDED WELL cheak plugs

  • nick helpap
    nick helpap Jan 30, 2008

    cheak change teh rca cables once ok try differt input maby that ch no good


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