Since that's an analog signal all bets are off that it's the TV. Before you go much further I'd move to some digital signals to test if the set needs work.
Just bought a new <span id="INSERTION_MARKER">s24a350h monitor. Had it for 2 weeks and its ocassionally showing a reddish tinted vignette and anything that I know is black is now a red tint. Using vga to dvi connector.