Question about Harman Kardon AVR 225 Receiver

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One speaker buzz when cold

I have a buzzing noise (bee in a jar) in my right front speaker and to a lesser extent in the right rear (smaller speaker) when I first turn on my receiver it has also had picture problems with the dvd player when I first turn them on. I have narrowed the buzzing problem down to the receiver itself through selectivly unpluging components, swaping speakers and wires,using a different wall outlet (both were well grounded). The sound doesn't change consistantly with the volume control but is slightly louder in the middle of the range and stops at the muted position.It doesn't go away with different surround selections.It gets alot quieter after the unit is on for 5-10 min.

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  • schmoggles Jan 24, 2008

    I have essentially the same issue... I've had it for quite some time, but it comes and goes... I suspect either a failed cap or perhaps some ultra sonic crap oscillating in the power amp stages causing it go "motor boat". I just benched it yesterday and ran it un-loaded for a few hours, but of course it didn't happen.

    In the next few days, I'll hang a scope on it, load it, and have the heat gun and freeze mist ready to go. If I get anywhere, I'll let you know.

  • jones3435 Feb 28, 2008

    I was thinking it might be the filter caps for the power supply, then I tried un-pluging the video board ribbon and just as you said the noise went away. I might just use this receiver for tunes in the garage and get a new one that can switch the HD video.

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It works fine for a couple of minutes the starts to hum. If you turn up the volume it masks the noise but is till audible, also the video switching cuts out. after examining the components I have seen some heat discoloration in the power suply area and believe it to be power for the video board. disconecting the ribbon cable form the video board the hum goes away, and so does any video wich does'nt matter for me because my monitorOne speaker buzz when cold - 1.gif does all the HD video1.gif switching. hope this may help with some noise problems.

Posted on Feb 06, 2008

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  • Mumrobs Apr 30, 2011

    I have the same issue! Very annoying.

  • dpollack317 Jan 02, 2012

    Un plunged the ribbon and no more buzz. I use HTMI now so the video is not needed any longer. Great easy fix. Thank you

  • Dave Hunter Mar 23, 2013

    This worked for me as well. Thank you!!!

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I un plunged the ribbon cable and no more buzz. I use HTMI now so the video was no longer needed, Great easy fix. Thank you

Posted on Jan 02, 2012

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