Almost 100% of Samsung TVs use the Red White RCA jacks to send audio TO the TV. You seem to have it hooked up wrong. Tell the full model number or just post a link of your model (samsung.com) so we can proceed.
I had a 28 inch Samsung HDTV. It was connected to a switch box and an AM-FM receiver so that I can hear the television sound through house speakers. I now bought a 60 inch Samsung, and when I connect the red-white wires to the TV, I get NO SOUND. I tried reversing them, and confirmed the switch box worked (it did when I switched to a cd player and a cassette player). The only sound I get is a bit of static when I touch one of the wires to the outside of the connection on the tv. I have changed the "audio settings" on the tv: mono, stereo, surround sound; with no luck. Is there another setting I need to change on the tv? This is so frustrating! Thanks for any help.