Just picked up a 50" plasma TV for free that works perfect except their is no sound. Anyone know what could be causing no sound? Went into menu and resetted soundings and nothing. I tried finding an option to enable and disable TV speakers but their is no such option. I turn the volume up and the volume displays appears and the slider moves as if the sound is being increased but nothing. I currently have it connected to external speakers via the white/red output for sound as a quick fix but would like to get the TV speakers working.