Using Video Mute - Mitsubishi VS-50800 Owner's Manual

Using video mute

When Video Mute is ON, your TV will display a blue or gray screen whenever
it receives a weak signal (or no signal at all) from Input-1, Input-2, Input-3,
DVD or Input-4. If a PIP is displayed the screen will be gray. If no PIP is
displayed, the screen will be blue.
When Video Mute is OFF, the screen will be black whenever it receives a
weak signal (or no signal at all) from Input-1, Input-2, Input-3, DVD or
Input-4.
60 Chapter 2: Operating Your TV