I have my sony bravia connected to my yamaha audio system with a hdmi cable, I have the tv set to sound from audio system but I am getting no sound

I HAD VERY SIMILAR PROBLEMS WITH PIONEER VSX 523 UNTIL GOT MEDIA BOX FOR TV SO ALL INPUT/OUTPUT ON AMP WERE HDMI AND NOW SOUNDS AND WORKS BRILLIANTLY

go to the shop and ask for USB/HDMI cable

try connecting the hdmi out from cable box to your tv hdmi input, and leave the hdmi out from tv to the reciever where it is, leaving reciever selected to 'TV' and yes, a sub matters (it is not part of your problem but you need the bass a sub provides)

you may have to set the input value on the bravia for optical on the input from the cable box. sometimes there is more than one way for a particular input to receive an audio signal, you may have rca(red and white), a black or orange rca type for digital, and then the optical. i would suspect you have to tell the bravia how the sound is inputed into the bravia. also , just a thought.... on the cable box there should be a volume control on the front of the box........ make sure the cable box volume is ALL the way up (it is the preamp volume).

Connect Xbox via HDMI to DTV/IN, Connect HDMI from out to Sony Bavia's HDMI/IN. Connect TV's Optical out to amps DTV/Optical in.

2X HDMI cables and one Optical are required.

Enjoy great sound :)

OH: choose the DTV input then stereo and then dolby 5.1 etc .. cheers

I recently got the same receiver and had the same problem. Here's what I was told - and it worked for me:

Even though HDMI cables carry audio and video, for whatever reason this reciever won't accept audio through hdmi. Apparently only much more expensive recievers carry audio through hdmi. What you have to do is run optical audio cables from your xbox, cable box, dvd player or other video device to the optical inputs on the back of the reciver. Then you customize the scene buttons to match your video and audio inputs.

You can get these optical cables pretty cheap on line or even at target. Don't get ripped off by Best Buy for these cables. I love best buy, but they rip off on cables!

This receiver is great - once I got it all figured out and running right I've loved it! Hope everything works out for you!

Like above, use an optical connection (need fiber optic cable) or a coaxial connection (single RCA cable). HDMI might also work, but I personally haven't checked. Connect the audio outs from the cable box to the audio ins on the home theater. The TV will only need a video connection from the cable box, as well as one from the home theater (for DVDs, onscreen menus).

This discussion can help you set up the universal remote.

Is Yamaha HTR-640 a receiver? Try HDMI from PS3 to receiver or Sony HDTV. If HDMI from PS3 to receiver the you need and HDMI from receiver to out Sony HDTV. You could connect everything to receiver and HDMI out to HDTV. You can not have an HDMI cable AND an optical cable coming out of the PS3, only one or the other.

Connect the PS3 to your TV with the hdmi cable and to the surround sound system with a digital optical cable, then set your PS3 to output sound through the optical port (through the sound options menu) and you're good to go!

You must run a Digital Optical cable from your PS3 to your reciever. Then press your function button on your recievers remote until you see SAT/CABLE on your recievers display. Next go to your PS3 settings and go to Sound settings, then Audio Output settings, and select Digital out (OPTICAL) then your done. This is the only way to get true digital sound from your PS3 to your reciever.