3 of my hd channels "pixilate" badly while the other 13 could not be better. i am guessing that there is a problem with the dvr tuner. comcast is due tuesday with a new box with hdmi connections. i have a pioneer pro930hd bur plsn to continue using component video.
It could be a problem in the QAM signal. Since it's only affecting 3 channels, I'd guess you have some form digital ingress that is causing the break up. Have your provider look into your signal to noise ratio on those frequencies, as well as general signal level strength.
thanks, they will be here tommarow. when they installed, the guy put in an amplifier on my cable in. it plugs into an outlet and runs to the splitter. i am now getting a "break up on about 5 or 6 of the hd channels.