A home theater system usually consists of a dolby digital stereo amplifier and 5 to 7 speakers.
Turn your stereo on and select the source that delivers video to the TV (DVD, VHS, Game, etc.). The video may be connected directly from the device to the TV, but the audio should connect to the stereo system (DVD, VHS, or other input). This way, the source audio is sent to the stereo and it provides the big sound to match the picture. Otherwise, you'd have to connect the source audio to the TV and let it's comparably tiny amplifier and speakers provide sound - that comes up short.
When playing a DVD, select the DVD input on the TV *and* the DVD input on the stereo. If you do not connect the audio to the DVD input on the stereo system, you'll have to connect to the TV, otherwise nothing will be heard.
SOURCE: LG Home Theater System LHT754 no sound
All you are currently doing is getting sound OUT from the LG HT system. If you want sound from your cable or satellite, you have to run a seperate audio cable into the back of the LG system. If you are running a cable line straight into the TV you need to run an audio cable OUT of the TV so you get sound via the LG system.
SOURCE: hooking up home theater
In order to run sound out of the reciever, you must wire your reciever via optical cable or RCAs to your Cable/SAT reciever. In other words, think of it this way.
For Video:
Samsung HTS ---> HDMI CABLE ---> HDTV HDMI #2
Cable/SAT Reciever --> HDMI Cable ---> HDTV HDMI #1
For Audio:
Samsung HTS ---> OPTICAL CABLE ---> Cable/SAT Reciever
*OR*
Samsung HTS ---> RCA (Two for Stereo) --> Cable/SAT Reciever
You want your HTS connected directly to your TV in order to prevent piracy software restrictions limiting or hassling your viewing of different media. Without connecting either RCAs or a TOSLINK (Optical Cable) to your Cable/SAT Reciever from your Samsung unit, you won't be able to hear it's audio output. HDMI Takes care of Audio/Video together, unfortunately the Samsung unit limits you to a single HDMI Output and no inputs for your other units to plug into.
With a TOSLINK, press the AUX button on your Samsung remote to Digital Input. When using RCA cables, set it to AUX 1 or AUX 2. You must lower your TV volume and use your Samsung remote to increase the volume of your Surround system.
Hope this helps!
SOURCE: no sound though home theater when watching tv
There is an orange button on the remote, half way down in the middle. I belive it has orange lettering and says something like "TV-?" press that, and the sound should start to come through your speaker system. You can then use the original remote that came with your TV and turn the sound off on the TV to use just the theatre system. I noticed that if you use the TV speakers in conjunction with the theatre system, that it echo's.
SOURCE: Hook-up Diagram for Samsung HT-Q70 Home Theater System
try to download the user manual here http://www.samsung.com/us/support/download/supportDown.do?group=audiovideo&group_cd=&type=hometheater&type_cd=03030000&subtype=hometheatersystems&subtype_cd=03030100&model_nm=HT-Q70&dType=D&mType=&model_cd=&menu=download&menuLink=/support/download/supportDown.do&prd_ia_cd=03030100&disp_nm=HT-Q70&isEqualsY= let us know. thanks.
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