On my digital TVs there's an input source button - it comes up on the screen and allows me to select where the signals to be displayed come from :-
ATV (analogue)
DTV (digital)
AV1 (satellite box perhaps)
AV2 (video recorder perhaps)
PC RGB (computer)
etc
One of my remote controls has a TV/AV button but none of then have a Digital/Analogue control - always on the TV itself a Circle with an arrow in it
Good luck...
Peccavi, November 2009