I had the same problem. Caused by cable tv coax cable. Try taking the coax cable out of the cable box. Then turn on your system and see if the hum is still there. But don't unplug the cable box from the wall. This will not do. You need to take out the coaxial cable that runs into your cable box, or whatever its first point of entry is.
I fixed this problem in my system with MONDIAL - MAGIC BOX. Bought it at musicdirect.com. No impact to picutre quality that I can detect. But the annoying hum noise is gone.
follow the link to check it out....
http://www.musicdirect.com/products/detail.asp?sku=AMONDBOX
I fixed this problem in my system with MONDIAL - MAGIC BOX. Bought it at musicdirect.com. No impact to picutre quality that I can detect. But the annoying hum noise is gone.
follow the link to check it out....
http://www.musicdirect.com/products/detail.asp?sku=AMONDBOX