My Flat Tv Just Shuts Down The Picture But Still Plays The Audio. Any Ideas?

The very first and simple step is to check whether your TV still displays menus after the picture is gone. For example, press the volume up button. If you do not see the volume bar, most likely your TV has a problem with display circuitry (TV has to display menus even if there is no external video feed). If you see the menus, start playing with the signal settings. Make sure that your TV is compatible with the signal source (like SD TV will not show 1080p video) and all cables plugged correctly. But it fails the “menu test”, it may need to see a tech. If the picture is on for some time after you power on the set and then goes away at some point, most likely, it’s either power supply or backlight (in LCD TVs) failure.