Samsung LS23PTNSF-ZA - Manual (Page 21)

Installing the Product 2-7
2-7 Connecting an HDMI cable
Connect the HDMI OUT port of the AV device (Blu-Ray/DVD/Cable/Satellite box) to the [HDMI (DVI) IN] terminal of the monitor
using the HDMI cable.
Press the [SOURCE] button at the front of the monitor or on the remote control to select <HDMI> mode.
You do not need to make a separate audio connection when connecting via HDMI.