Samsung LS22CRNSF-XAA - Manual (Page 27)

If you just connect using the DVI to HDMI cable without connecting to the sound source, you
cannot hear sound.
Connecting the audio output terminal of a digital device to the [R-AUDIO-L] of [AV IN] of the
monitor using an audio cable will not give you sound. Make sure to connect to the [HDMI/PC DVI-D
AUDIO IN] terminal of the monitor.
3. Connecting and Using an Amplifier
You can connect the digital sound input (optical) or standard sound input terminal of your amplifier
to your monitor using the correct cable.
1. Connect the [DIGITAL AUDIO OUT (OPTICAL)] terminal of your monitor to the digital sound input
terminal of your digital amplifier using an optical cable.
2. Set the Internal Mute On in the Sound menu using the MENU button.
3. Adjust the sound volume using the Volume button of your amplifier
4. If the connections are set up, power up your monitor and amplifier.
Because no sound is emitted from the monitor, you need to use an amplifier.
For information on how to connect a speaker and amplifier, refer to the respective user manuals
provided by their manufacturers.
4. Connecting Headphone
You may connect your headphones to the monitor.