My surround sound works if playing a DVD or radio but not for TV channels. What am I doing wrong?

SOURCE: Sony DVD Home theatre system

Hello,
lets perform special reset function in your home theater.
1= set to stand-by mode
2= press three buttons of "Stand-by, Function & Volume- " all togather.
3= you will see "Cold Reset" message on front display of set.
4= power up and enjoy ;)

SOURCE: Surround sound

go to tv menu> sound settings> enable surround.

SOURCE: Sony surround sound hookup

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!

SOURCE: Can't get XBOX 360 to have audio through surround sound speaker

Make sure that you have the RC Cables (red and white) plugged into the audio ports that coincides with the component video inputs. If that wont work then try plugging the audio and video cables into the inputs for the satellite, since that works. That way you can isolate the issue. If it still wont work try using the XBOX 360 HDMI cable. That has both audio and video.

SOURCE: Surround sound to work with sky+

hi yes it is....
wot u need to do is.....our red and white audio leads go from sky box to dvd box...we then put our dvd player onto video 1 using function button on remote
hope this helps