We just set up our tv (Hitachi 55HDX99) and hooked it up to our speaker system/DVD player (Sony DAV-HDX500 Home Theatre System) & PlayStation III. While watching tv speakers on the Hitachi work fine but they are not supporting our Sony speakers. Oddly enough the Sony speakers work when we play a PlayStation game on the tv and when we watch a DVD. How can we get our Sony speakers to kick in when we are watching tv? It is strange that the speakers only play for the game system and dvd player. Hope this is enough info for you to help diagnose. Thanks for your time!!!
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Please check at rear of TV for Digital Optical IN port as home theater should have optical out port at rear. If you got any optical in port in TV, just connect optical wire between TV and home theater.
2nd option is check Line Out pins at rear of home theater system, if found, hook red-white RCA cable there and put it to same input in TV where you hooked Video (composite or component) cable.
In short, the answer is: Hook up all three to each other. I have a Samsung DLP HDTV, and I was trying to hook up a Sony DAV-HDX500 home-theater system and a Comcast HD set-top box, but I found that the Sony user guide is helpful only for setting up the speakers. Most of what it had to say about HDMI and getting the TV sound or cable sound to go through the speaker system was wrong (or, at least, it didn't work for me). So, here's what I did. I connected Component video cables (Y/Pb/Pr out) from the Cable box to the TV (Y/Pb/Pr in), audio cables from the Cable box (audio out) to the Sony system ("SAT/Cable" audio in), and an HDMI cable from the Sony system (HDMI out) to the TV (HDMI in). This allows me to 1) watch DVDs with surround sound through the TV's HDMI source (when the "DVD" format is selected on the Sony system), 2) watch cable with surround sound through the TV's Component source (when the "SAT/Cable" format is selected on the Sony system), and 3) watch cable WITHOUT the surround sound, as I did before I ever had the Sony system. One item of note: When watching a non-HD channel with the surrond sound on, the audio is slightly out of synch with the video; thankfully, there's no such problem on HD channels. Anyway, I hope this helps. It drove me crazy for two days straight!