Press the TV's round on/off button, which has the slash mark through the center of the circle, to shut off the set. You can also turn of the set using the television's remote control.
Line up the shape of the plug on one end of the cable with the six-sided jack on the back of the LG 42LD450, or use the jack on the side of the TV cabinet. Make a note of the jack label, for example "HDMI 1" or "HDMI 2." Push the plug straight in as far as it will go.
Insert the other end of the cable into one of the labeled HDMI outputs on the back of the surround sound receiver. If you have a jack labeled for a TV on the receiver, use that one. Otherwise, you can connect to any HDMI output on the component. Make a note of the label on the jack, such as "TV," "Video 1" or "Video 2."
Turn on the power for the receiver and the TV. Press the button on the receiver's remote control that corresponds to the jack input conncection on the back of the receiver as described in Step 3. (TV, Video 1, or Video 2).
Press and release the "TV/Video" button repeatedly on the LG remote control until "HDMI 1" or "HDMI 2" displays on the screen, depending on which of the two jacks you used to connect the surround sound receiver. You are now ready to enjoy surround sound and a digital high definition picture.