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Have you enabled the external speaker option on your TV and the set isn't on Mute? Check that you have the surround system's receiver set to the correct input. Next, check the audio level. On some sources for the TV, I need the volume at 65. Other sources sound fine with the receiver at 45. Check that the audio matches that being sent by the TV. On my TV, I needed to go to the Menu > Audio Settings to find the option for turning on the external speakers. Then I had to set the speaker system to Multi-Channel for our specific setup. (There were several options, including Dolby. For my specific setup, these other options didn't give the correct sound.) Finally try a different audio cable between the TV and the receiver.
I hope this helps. Please add a comment with the make and model number of your TV for additional advice. Adding the type of connection (digital audio (optical/coaxial), HDMI, RCA) will help me suggest potential problem areas.
Generally you will connect the Digital audio or optical audio cable from TV to the input of Receiver. Then using the remote control of Receiver you will program the source for digital audio or optical audio as TV. I am assuming the speakers on the receiver are already connected and working. All you do is then turn on TV and turn on Receiver and select TV on Receiver. The TV audio will play through the receiver. Make sure the TV sound is in Mute.
AV cables don't pass surround sound through, they are pretty much just left and right stereo. You need to turn pro logic on on the reciever to "pretend" to play surround. The better option of course would be to use a digital signal like another HDMI cable or digital optical audio from the cable box, if thats what your using.
If you have a coax (antenna or some cable systems) to the TV, then you need to connect the surround sound system to the audio out of the TV. Depending on the TV, the output could include Digital audio, RCA audio (red/white) or a headphone jack. Without knowing which LG TV model, I can't be sure which ones you have. Get the best cable for your TV/receiver system and connect that. Then set the TV to use the external speakers.
If the source is a set-top box, then the cables should run HDMI from the box HDMI out to the receiver HDMI in and then from the HDMI out of the receiver to the HDMI in on the TV. (Most TVs do not have HDMI out.) If the unit still doesn't play the audio, first try new cables and make sure the correct source is selected (some receivers have multiple HDMI in). Make sure the speaker cables are all connected (if they have separate connections) and that everything has power. (One of the usual speaker system problems in my house is loose cables from someone knocking against the back of the entertainment center and pulling.)
If you need more help, please provide more information on your equipment. I will do my best to help you diagnose the problem.
Thats because if you look in the owner's manual, it declares the fact that it will only broadcast sound from hdmi to monitor not speakers. For sound out of speakers need to connect additional audio cable.
As dumb as this sounds here is the mistake Sony made. The receiver does not process sound from the HDMI, it will only pass through that data to you TV. So you will not be able to get sound from your 5.1 speaker setup if you only connect the HDMI, you have to use the matching audio input for that respective HDMI input. Make sense? So the HDMI DVD Input must have digital coax for sound, HDMI Video2 must have fiber optic for sound, and there is another fiber optic port for the Sat input. Yes thats right, if you have 2 HDMI HD components and each only has fiber optic(neither one has digital coax) you cant hook both up properly the way you would think. Sony made this receiver poorly, turning High Definition Multimedia Interface into High Definition Multimedia Except For Audio Interface.