I'd try the usual unplug all connections then pull the power plug and and wait 10 minutes. Apply power, then see if it comes back. Press a menu button and what happens.
was watching tv and when i changed the channel the screen just turned black,i can see like silhouette when i turned the lights on,,i also have audio,,tv is like 2yrs old.is this an expensive fix??what causes this?pls help thanks!!!