Is this a video card with a TV out chip or a TV Tuner PCI card?
If it's a TV tuner card, the command "lspci -vv" (as root) will display information that will help us determine the problem, do the following to get the output as a text file called pci-bus.txt,
Code:
lspci -vv > pci-bus.txt
Then cut and paste the section about the card you need to get working.
If it's a video card with a TV out chip then we need to know the make and model and what driver your using for it.