Samsung PL64E8000GFXZP - Manual (Page 576)

separate audio cable is required.
If your TV has a headphone jack, make
sure there is nothing plugged into it.
Reboot the connected device by
disconnecting, and then reconnecting
device’s power cable.
The speakers are making an inappropriate
noise.
Check cable connections. Make sure
a video cable is not connected to an
audio input.