I'm having some issues with my SA STB following upgrading my TV from an older Toshiba 720p LCD to my new Panny 50G25 1080p-capable plasma. At least, I hope it's just the box, not the TV.
I'm getting severe artifacting (mostly horizontal banding/blockiness) which makes the picture unbearably jumpy and causes the audio to cut in and out. However, this is only occurring on HD channels, and then only on SOME HD channels, not all.
For example, HBO HD is beautiful, but Fox News HD is awful. Local HD channels are great, but Spike HD garbage, and so on
I get the same effect whether displaying the signal over component (direct from STB to TV) or via HDMI (from STB, to AVR, to TV).
The TV appears to have no problems displaying Blu-ray 1080p, as previewing Avatar last night demonstrated. AFAIK
, the SA 8300 will only display up to 1080i, which my TV is capable of handling.
My next steps to diagnose the problem are (I guess) to
1) swap out the 8300 for one of my non-DVR HD STBs and see if I still get the artifacting. If I do, then I suppose it's NOT a STB problem. If I don't, then it's off to Comcast for a replacement DVR. OR
2) what? Suggestions? Contact Comcrap and get a service call to test the line strength to my setup? Other?
Other than the above, are there STB or possible TV settings I'm not taking into consideration? I currently have the DVR HDMI upconvert option set to pass through.
Thanks, in advance, for any help.