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Original Message
RE: Annoying whistling tone on Denon AVR-550SD digital HT receiver
Posted by mrdavis842 on March 15, 2015 at 22:39:13:
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.