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Hello, Do you have sound through the TV speakers right now, or no sound at all?
Also, what's the model of the Yamaha?
Okay then first you need to go into your Samsung's MENU and under audio/sound you need to shut the TV's speakers off, or select any option that does not include TV speakers. This needs to be done to turn the optical port on. Try that and let me know how it goes.
Is the Yamaha set to the correct optical port that you've plugged into? Is the volume turned up on the Yamaha?
Something's wrong then. What is connected to the TV for sources - is there a cable box please? If so check the back of the cable box for an optical jack and plug the cable into that so the optical is from cable box to Yamaha. Let me know what happens.
Then you have an issue with your optical cable or your Yamaha then. Is this receiver brand new? Also if you select another source on the receiver like the FM tuner is there sound then?
It doesn't matter if it's a brand new cable or not. Right now you have an issue with either the cable or the receiver. Let's try this since the optical is assignable in the Yamaha, try selecting ALL of the different input sources (CD, etc. etc. etc. ) instead of just DBS. Let's see if any of them activate the optical port.
All I'm saying is this: Try selecting EACH and every one of the different Inputs using the buttons on the Yamaha and see if any of them give you sound.