Samsung 173MP - Manual (Page 32)

Direct-Access Features
1. Source
Switches from PC mode to Video mode.
The image size automatically switches to Full when Video mode is on.
To switch Screen modes: [PC]
[DVI] [TV] [AV] [S-VIDEO] [COMPONENT]
2. Volume
Push the "+ VOL -" button to adjust volume.
1. Push the "-" button to decrease the volume.
2. Push the "+" button to increase the volume.