This is strange. I can't seem to figure out how to select Dolby 5.1 and not DTS from the disks setup menu. My sound works fine on the previews but no sound in the movie. My receiver doesn't have a DTS decoder. Any ideas?
Try pushing the Audio button on your DVD remote which will toggle through the Audio soundtracks on your movie (DVD, Blu-ray, HD-DVD). This can be performed while the movie is playing. I have not come across a DVD that only had a DTS track.
You might also try disabling the DTS audio output from your DVD player. Normally this option is under Audio Setup from the DVD player setup menu and is often only adjustable when the movie is stopped.
Well BD will send down core 5.1 or DTS through the TOSlink. I decided to upgrade my receiver to a new Onkyo and take advantage of the TrueHD and Master Audio DTS with Audesey DSX Wide 7.1 setup. It sounds awesome!!!
BluRay often has only DTS tracks. Set your player to output PCM instead of bitstream. This will cause the player to decode the DTS instead of your receiver.
If you receiver is connected to the receiver with only coax digital or optical cable, you'll lose surround, but will get stereo. If your receiver is connected to the player via HDMI, then there's a good chance you'll get full surround sound.