Can not get sound on Samsung plasma TV

Hello there, Rudy13.

The following Knowledge Base article provides some great steps for troubleshooting your issue:

Apple TV: Basic troubleshooting

http://support.apple.com/kb/ht1551

If the issue persists after reviewing the primary steps recommended in the article then this section may prove useful:

If you can see video but can't hear sound

1. If Apple TV is connected to a receiver, make sure the receiver is turned on.
2. Make sure the input setting you've selected on your receiver matches the input you have your audio cables connected to. See the documentation that came with your receiver for more information.
3. Make sure the volume on your TV or receiver is turned up and isn't muted.
4. Check whether you can hear sound while playing video only. Also, check whether you can hear audio feedback while clicking through menu options.
5. If you're connected to the HDMI port on your TV and Apple TV, make sure your TV supports audio through its HDMI port. The HDMI ports on some older TVs support only video.
6. If you are using HDMI audio, try disconnecting and reconnecting the HDMI cable.
7. If you're connected to the HDMI port on your TV and Apple TV, make sure your TV is setup to receive audio from HDMI. For some TV's this is automatic, but for others there is a choice between digital and analog (for HDMI audio, choose digital). Read more about HDMI audio.
8. Try the other audio outputs on Apple TV to see if they work.
9. If possible, try using different audio cables.

Thanks for reaching out to Apple Support Communities.

Cheers,

Pedro.