Samsung LS24C570HL-ZA - Manual (Page 33)

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Connecting and Using a Source Device
2
2 Connecting and Using a Source Device
2.3.4 Connecting to Headphones
Do not connect the power cable before connecting all other cables.
Ensure you connect a source device first before connecting the power cable.
1
Connect an audio output device such as headphones to [ ] port on the product.

This function is only available in HDMI mode.

The sound could only be heard when using the HDMI-to-HDMI cable.
2.3.5 Tidying Up the Connected Cables
DC14V HDM I IN RGB IN
DVI IN
DC14V HDMI IN RGB IN