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This Post Has Been Edited by the Author
In Reply to: RE: Annoying whistling tone on Denon AVR-550SD digital HT receiver posted by jon_beardy on March 12, 2015 at 18:09:24
The only caps of concern would be the electrolitics and they don't always look bad. The only way to be sure is to remove and measure them.
Try disconnecting the cable to the display and see if the noise still presists.
If the volume control is a pot I would clean it with contact cleaner.
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