User's Guide T 31
Adjusting Your LCD Monitor - User Controls
4. Channel
When OSD is not on the screen, push the 
+ CH / 
- CH button to select channel number.
1.Push the 
button to decrease the channel number.
2.Push the 
button to increase the channel number.
This function is available in TV or PC + TV (PIP) mode only. You need to connect a TV tuner box (option) to make PC+TV mode appear in TV mode or PIP mode.