First time poster so please pardon my lack of experience on the AV forum.
I just recently acquired a Sony KDL-52Z5100 and also married to a Comcast Bill in order get my HD programming, before the Sony I had a campy TH-42PA25 Panasonic Plasma, nice 480p progressive plasma connected to a Comcast HD Motorola DVR with no problems with the signal whatsoever until recently.
I drop my DVR box for a new Motorola DCX3200 HD Box, slimmer and compacted than the usual, since I plugged the box to the Sony via HDMI, I have been getting this "Unsupported Signal, Please check device output" annoyingly in-between HD and Regular Programming. Some times when viewing an HD Ch and also a normal Ch. I don't lose any of the signal image or sound, I just get the pop up message with frequency.
Comcast is so loathsome they charge subscribers for a messy and confusing lineup. Why do they keep creating a fake illusion of non digital channels and HD offering when all channels are suppose to be operating in HD?
I am frustrated given that I am a rookie dealing with AV and such things. I will appreciate any troubleshooting help. Not sure if it is the cable Comcast provided, which most likely is refurbished.
HD Comcast Cable Box with HDMI interface to TV
Blu Ray with HDMI interface to TV
Nintento Wii with RCA plug to TV
Comcast HD Signal strength on average is no more than 720p, near downtown Washington, DC.
The Cable Box is DCX3200 All-Digital, HDTV, M-Card Host Set-tophttp://www.motorola.com/Business/US-.../DCX3200_US-EN
(Link to Motorola)