Samsung 173MW - Manual (Page 31)

On-Screen Display
2. Source
Changing the source is allowed only for external devices that are connected to the monitor at the
time.
Ex) When there is no external device connected:
[PC]
[DVI] [TV]
When connected to S-Video:
[PC]
[DVI] [TV] [S-Video]
When connected to Component:
[PC]
[DVI] [TV] [Component]