Hi Jose,
Welcome to the discussions.
The PCMCIA TV Tuner card is a PCI expansion card. The Powerbook G4 does not have PCI expansion capabilities.
I don't think that it is possible to turn a Powerbook into a TV. You may be able to set up a video input, and just use the screen, but you would be using an external TV tuner.
By the way, this section of the discussions is for the PowerPC G4's (the Towers). It's probably better if you post this issue in the Powerbook section of the discussions - that way, someone with greater Powerbook experience than I have will see it and be able to advise you.
Cheers!
Karl