I have a LG47" tv

Your DVD audio is sent directly to your receiver - not to you TV. That's why you can hear the audio on your stereo. The TV audio is not being sent anywhere - it is "stuck" in the TV and is amplified and sent to the TV speakers. Since the TV speakers are off, you don't hear anything. In order to listen to the TV audio on the stereo system's speakers, you need to send it to the receiver.

You need to have a pair (left + right signals) of audio cables (assuming you wish to listen to stereo sound) from the TV's Audio Output jacks to a pair of Audio Input jacks on the receiver / amplifier. You can use any unused input - CD, Video, Tape, Sat, etc. If you use Tape or Sat audio inputs, when you wish to listen to the TV audio, you must select the Tape or Sat input on the receiver.

Do not send more than one signal to a set of inputs on the receiver. Typically, a CD, DVD and Sat inputs offer two or more of the following types 1) Analog audio. These are the older RCA jacks that have been around since the beginning and require separate cables for left and right channels. 2) Optical inputs. This is the newer digital interface that provides for Dolby Digital (and others) format sound over a single fiber optic cable. 3) Coaxial inputs. This jacks looks like an RCA jack, but usually has an Orange ring - instead of the Red & White rings that analog RCA jacks have. They use a single coaxial cable. 4) HDMI input. This jacks carries both digital video and digital audio signals. If you are using an Optical input for the DVD on the receiver, do not use any other unused analog or digital inputs associated with the DVD to "piggyback" another device like a CD , VHS tape, etc.

I hope this helps and good luck! Please rate my reply. Thank you.