To hook up PC audio, it should be a standard 3.5mm male to 3.5mm male connection.
In some cases, it may be a RCA to 3.5mm I'd definitely recommend taking a look to see which connection in the back of the television denotes "PC" when associated with audio.
What are the specifications for the PC audio cable refered to in the owners manual page 11 for a LN-T4042H Samsung TV? I assume one end is a standard single jack to hook to a PC headphone audio out jack. What size connector in used to hook into the PC audio in single jack on the TV?