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You don't. You change the signal at the source device end, not the TV.
If you have connected a Blu-ray player or a games console, then set the device audio option to Bitstream. This will send a data stream to the TV that it will decode either as Dolby or DTS depending on the source signal format.
Dolby Digital is only an option for an external AV source connected via HDMI. That's the only way to get a Bitstream signal in to the TV. The TV's internal tuner is only capable of PCM audio. It's a DVB-T tuner (standard definition) rather than the DVB-T2 tuner needed for HD. Even then, only the HD channels are encoded in DD.
Iff your BD player or console is decoding to stereo PCM, then it's doing the same job as the TV. There's a small advantage with one of the audio processing modes in how it limits the dynamic range, but other than that PCM and DD will sound identical. This is especially the case with any TV that has no optical audio out, as in this case. The TV can't pass a DD signal out to an external audio system. So all sound is played via the internal speakers or headphone jack. It'll all sound the same, PCM or DD.
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.
HI, make sure the audio out put on the ps3 is set to hdmi and set to stream dolby digital,aac, dts, etc,then set audio input on your 696 to hdmi,also check that audio out for hdmi is set to off in the hardware menu on your amp,if you still have problems use the optical out on the ps3 as the ps3 does not out put hd master audio or dolby true hd only pcm, you will still get dolby digital.
DTS-HDMA and Dolby TrueHD cannot be passed to your receiver via bitstream on the PS3. DTS-HDMA cannot be decoded either so you're out of luck there.
Dolby TrueHD can be decoded internally on the PS3 assuming your firmware is up to date. Set the Blu-ray HDMI output to PCM and you can then pass it to your receiver.
If this doesnt work, do a system update on your PS3.
Not so much an answer more a shared problem with a slight insight.
On the Panasonic manual page 40
It states the following:
This unit can decode the surround signals received through cable TV box, digital broadcasting or satellite broadcasts. Refer to your equipment’s operating instructions for details. Only Dolby Digital and PCM can be played with this connection. So it sounds like the SA-PT850 unit will decode DTS from an internal source ie DVD but not from an external source ie ps3 or WDTV which is a shame because I own a WDTV. The solution for me is to convert the dts to ac3 (Dolby digital) which works great. But not sure if this is an option for you.
Your amplifier should "downgrade" the signal to 5.1, even if the disc isn't using it. It is most likely a setting on your amp that may need adjusting for "types" of digital to accept on its input. If you can, set your optical input on your amp to "auto". This way it will automatically detect and switch for the proper incoming audio feed