I have no solution, sorry, I just wanted to confirm the problem.
Not exactly with the TV output, but in general I can't switch to the console for some months (http://www.nvnews.net/vbulletin/showthread.php?t=128200
I have two cards, one of them with DVI and VGA connected (GS7300) and the "main" card (7300GT) has only DVI connected.
If I terminate X I don't see the console, just one blinking cursor upper left.
But typing works!!! I can blindly log in, execute arbitrary commands etc...
This is bothering me long enough, so please tell us the switch to enable console again
Just kidding, but I wonder if nvidia can reproduce this.