BenQ RE6503 User Manual page 73

Problem
Touch function invalid
Touch positioning not
correct
No picture and no sound
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 touch driver is installed and started.
• Check whether the size of article touched is comparable
with finger.
• Check whether driver is properly installed and make
correction.
• Check whether touch pen is facing the screen.
• Check whether the machine is started state.
• 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.
Solution
69
Troubleshooting