Hey... just reading the manual.. p28 "enjoying the sound effects" note says that "this machine is not equipped with dts digital surround decoder. when you select digital sound, sound is not output during playback disc with dts."
not sure of the implications of this, but sounds like the problem you spoke of
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Could be many things - I know, bad answer. There is no simple answer or fix.
Without more info one can only speculate.
Please determine and answer as many or all of the following so that we can help.
1) What is the make and model number of the Surround sound unit?
2) What is the make and model of the DVD player?
3) How is the DVD player connected to the Surround sound unit?
3a) Is it connected via an HDMI cable?
3b) Does the DVD player have regular stereo connections that you are using (we call these analog audio connectors)?
3c) does the DVD player have digital audio outputs that are connected to the Surround sound receiver?
4) Did the DVD player EVER make sound?
4a) if yes - what changed?
4b) if yes - does this happen with different discs?
Now some general points.
I'll assume that the other sources do work and play sound through all speakers when they are supposed to play sound through all speakers.
Then - I'll assume that without changing anything else you select the DVD player input that used to make sound but doesn't now.
Problem could be the encoding option that you have selected when you play the disc.
Many DVD's and Bluray's have audio options that you can select from the disc's main menu.
Dolby digital is the most common - also known as AC3.
Some discs have another digital audio track called DTS.
Not all surround receivers can decode all formats.
Even if your surround receiver claims to be able to decode AC3 and DTS, they will not if you don't connect the correct cable to the receiver and usually map the input to the correct digital audio connection that you are using OR if your DVD player is not capable of outputting all formats.
There are many different ways to connect the gear and many different ways one can configure correctly or not; all contributing to whether you get sound or not.
So in the above example - by selecting DTS, you do not get any sound - then try another audio track option. Basic stereo usually works (also know as PCM - which is audio like a CD).
OR maybe you never properly configured the audio properties of the DVD player.
Go into the DVD's menu or set up options and see what you find but make sure you know how the DVD is connected to your surround receiver!
As you can see - there is no simple answer without a lengthy Q and A exchange first.
Check HDMI Sound settings: Enter Setup menu via remote, then Func. Setup / HDMI / Audio. You can choose from Amp (sound will be played via Yamaha), TV (sound will go straight via HDMI out to your TV and not play on Yamaha) and Amp+TV (Yamaha will play the sound and also pass it to the TV). Also what is your source? DVD or some network player? For example Yamaha cannot decode audio in AAC or other computer formats, so be sure to change the audio settings of your player to output PCM and not raw/bitstream.
First check that the DVD has DTS (digital theater sound). Then you may need to change the audio option. In the main menu of the dvd go to sound options or set-up and check that its not 5.1 or some other audio option and is in DTS.
You did not list the make or model of your dvd player and or receiver, It would help if I had this info.
PCM mode will not output dobly digital, use the digital cable connection, not RCA cables, set DVD audio output menu to Dolby digital or DTS. On DVD software menu setup select audio then Dolby Digital 5.1 or Dolby Surround.