I'm an avsforum n00b, so apologies in advance if this is in the wrong forum.
I recently got a 42" Vizio 1080p set and connected a Sony Blu-Ray and a Comcast (greater Boston) HD-DVR, both with HDMI.
Everything from the Blu-Ray comes through flawlessly.
Watching the HD-DVR (a Motorola DCH3416), however, I often get digital artifacts, especially horizontal bands of pixelation. I've tried swapping the HDMI cable, removing my cable splitter, and moving the cable away from power cords and speakers, but none of these had any effect. The HD-DVR is outputting to the TV at 1080i. It seems like *maybe* the artifacts occur a bit more often when the device is recording one show and displaying another (the DCH3416 has two tuners), but I see the artifacts frequently enough (a few times per minute) even when just watching live TV to think it's not just that.
Has anyone else experienced this? Might it be a bad box? Or is it typical of Comcast HD? Any other ideas for troubleshooting?