It depends on what hardware you have and the interfaces on that hardware. USB to RCA will not work. There are various interfaces available for interfacing the PC to a TV - S-Video, HDMI, VGA to a TV VGA input. It just depends. It will also depend on your PC's hardware how you connect audio to the TV, unless you have an HDMI output that is both video and audio, you will have to run a separate audio out from the PC to the TV.
More info on your specific PC's capability and the same with the TV is needed for someone to help you.