My Panasonic 32" HD 100HZ Motion Picture Pro LCD TV-TX32LXD85 makes a loud humming noise, which gets worse the darker the picture. If I set the picture setting to Dynamic, the humming isn't as bad, but it still can be heard whenever the picture fades to black or is dark. On all other settings, the humming is intolerable. Has anybody else experienced this?

Dave L, November 2009