Question about Harman Kardon AVR 225 Receiver

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Humming noise I have a humming noise when I play the tv or the dvd coming from my receiver or the speakers. When I play the radio it does not hum. I have surround sound and a Harmon Kardon AVR-35.

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Usually Humming noises come from frequency interferance.  In this case it is being caused by your input sources.  A smiply solution is to replace the cables and or seperate the source cables away from any electircal cords or sources.

Posted on Jan 07, 2009

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Some kind of ground potential difference between the TV and the AVR or perhaps it's a badly shielded cable.

Considering the multitude of variations you may have connecting the TV video and audio to the receiver it's hard to pin it down, but try removing all cabling between them and that should silence the hum. Add any cable and see if it comes back. Disconnect it. Test each cable the same way. At some point a single cable might be implicated. Replace it.

Also consider routing of any analog audio cable near power cables, the TV or other sources of high voltage and magnetic fields. I have a known problem when my overhead dimmer-controlled track lighting is on. Food for thought.

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1. Connect the tv output into another input on you receiver to see if it isnt the channel on the receiver.

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barneyluc

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