Trouble getting digital audio from Sharp Auqos to RCA home theater system.?

This may answer your question. Most TVs will not pass through digital audio from external sources to their digital audio ouputs. That audio output is for digital broadcast stations received by the TV's internal tuner only. Check your TV's instruction manual to verify this. What you should do is connect the cable box, DVD player or any other external device directly to a digital input of your A/V receiver. Then select that receiver input for audio when you use that device. Also connect the digital audio output of the TV to one of the digital inputs of your receiver to get Dolby 5.1 from broadcast.

Wow...you are trasmitting an analog signal via the component cables from the Comcast box to your TV and then digital out to the receiver, right? Well you need to just put the input of the receiver on the corresponding input you have thrown the digital coax (guessing since you didn't specify...that or optical) or 'digital audio' cord as you said. This will get sound BUT you are only as strong as your weakest link. Weakest link = analog audio from Comcast to TV. Solution = get a Comcast box with HDMI (component video sucks) or use the digital audio ouput (digital coax or optical) from the Comcast box. If it doesn't have one, get one from your provider that does! Digital audio to digital audio = digital audio. Analog audio to digital audio = analog audio. Yes, there IS a noticable difference.

You should connect your cable box to your receiver for audio, that why you should get better sound for for Dolby 5.1, also make sure you are getting HD signal from your cable system otherwise you are not getting 5.1 sound.

that sucks