Video Asylum

RE: Annoying whistling tone on Denon AVR-550SD digital HT receiver

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mrdavis842

In Reply to: RE: Annoying whistling tone on Denon AVR-550SD digital HT receiver posted by jon_beardy on March 03, 2015 at 16:33:52

My first thought would be a capacitor going bad but that is just a guess. Your best bet is to take the top off and pin-point where the noise is coming from.

Follow Ups:

RE: Annoying whistling tone on Denon AVR-550SD digital HT receiver - jon_beardy 18:09:24 03/12/15 (1)
The whistling noise is coming from the speakers, not within the casing of the amp, so it's getting mixed in with the audio signal at some point. I had a look inside for any obviously bulging or leaking caps, and couldn't see anything out of the ordinary. Judging by the fact that the display has an impact on the whistling tone, is it perhaps worth reflowing the display pins, or checking any caps near the display?
- RE: Annoying whistling tone on Denon AVR-550SD digital HT receiver - mrdavis842 22:39:13 03/15/15 (0)
  The only caps of concern would be the electrolytics and they don't always look bad. The only way to be sure is to remove and measure them.
  Try disconnecting the cable(s) to the display and see if the noise still persists.
  If the volume control is a pot I would clean it with contact cleaner.
  
  Edits: 03/17/15

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