I have a proview 40 inch hd LCD tv model 4000. I am connecting an antenna craft omnidirectional amplified antenna. The picture is beautiful after scanning channels. However, I have no sound. I have tried rescanning, but no changes. Sound works great for all other components. I am not sure if there is something I m overlooking in the tv settings. Antenna works great for my 32 inch Sony Bravia, so I know the antenna is fine. Help!