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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I have a Denon Surround receiver, model AVR-1804 which manages our home surround sound system (6 speakers including a sub-woofer). When the TV (Visio HDTV) is turned off, but the receiver is still on, we...


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.

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It wounds like you are getting interference from you tv to the receiver. You can try a few different things here.

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This a problem of input grounding,the cable input is already loose or crack solder that why you hear a hum or distorted sound because not properly grounded it is a loose contact already thats why also is need to warm up and it will come.First change the cables with a new one with identical size and value then if problem still exist open the back cover ,when open look for the cable input connection parts joints reworks or resolder all soldered joints there .Then checks if it works then cover the unit.If you have no knowledge of electronics dont attempt to open to avoid electric shock.Find a electronics repairman or bring this to a authorized electronics repair shop maybe it cost you only $50.

Good luck;

Dont forget to rate...

Regards:
VOTIT

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barneyluc

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