BenQ RP654K User Manual page 79

No picture and no sound • Check whether the machine is started state.
With horizontal or
vertical stripes or image
dithering
No color, color is weak
or image is weak
With image but without
sound
Only one speaker has
sound
VGA output without
sound
• Check whether signal wire is well plugged, whether
INPUT is corresponding to it.
• If in internal computer mode, check whether internal
computer is started.
• Check whether signal wire is well connected.
• Check whether other electronic equipment or power
tools are placed around the machine.
• Adjust chromaticity and brightness or contrast in menu.
• Check whether signal wire is well connected.
• Check whether mute button is pressed for mute.
• Press VOL+/VOL- to adjust volume.
• Check whether audio line is connected correctly.
• Adjust sound balance in menu.
• Check whether computer sound control panel only sets
up one sound channel.
• Check whether audio line is connected correctly.
Check whether connect external device with headphone
cable.
Troubleshooting 75