I have the same problem with my NV17 card (GeForce 4MX), these come with an own TV chip made by nvidia. Until 3123 the TV out works perfectly, then I'm just getting a black screen too.
I got the same problem with the WINDOWS drivers, it is only working with some older dirivers, so I filed a bug for it. You should do that too, so it gets fixed.
Until now we have to stick with the 3123 drivers.