Samsung QN75QN8 B Series User Manual page 247

There is No Sound or the Speakers are Making an Odd Sound
The color and design of the TV and its accessories (including the remote control) and the features may differ depending on
the model or geographical area.
If your TV does not produce any sound, press the Volume + button to increase the volume.
If your TV is connected to an external device, check the volume of the external device.
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