You can follow the 'recipe' below to get everything connected properly ;). The video signal from the Comcast box will go directly to the HDTV since the HT component lacks HDMI inputs. The audio output will however connect from the Comcast box to your receiver for surround sound. In summary, you will need two HDMI cables and one digital optical cable. Enjoy!
Comcast box (HDMI out) -> (HDMI in) Sony Bravia HDTV
Comcast box (digital optical out) -> (digital optical in) Sony HDX678WF
Sony HDX678WF (HDMI out) -> (HDMI in) Sony Bravia HDTV
I have a Sony Bravia TV mounted on the wall with a comcast digital cable box already connected. (works fine) I want to connect Sony HDX678WF home theater. If I purchase an HDMI cable, is that the only cable I need to play the 5 Disc changer/DVD and the tv thru the surround sound system? The directions say to connect a component video cord, blue, green, red to the video in on the back of the receiver. Link to manual- http://safemanuals.com/314159.php?k=03b83f4ba6bac9831281eedf0475c86c&ID=691663&q=SONY DAV-HDX678WF
If I unplug it from the back of the digital cable box (because the other end of it is plugged into the back of TV which is on the wall)and plug it into the receiver I have no picture on the TV. So if I purchase the HDMI cord, do I still leave everything else connected the way it is? The instructions are very vague or not existant regarding the cable box.
Thanks for any help!