Advertisements Lost over half of my HDTV channels with Comcast. They have checked everything and had 3 different technicians out and they even replaced cable. I have 2 different Tivos which I have had for maybe 6 years. They say it is Tivo problem. When I go to Tivo Channel Power it shows 100%. Both Tivo's have TSN Prefix of 652. Any help would be appreciated.