Troubleshooting - BenQ T420 User Manual

Troubleshooting

Problem
No picture
No sound
The computer input
image looks strange
The control panel
buttons do not work
Check the following:
• Is the display turned on? Check the power indicator of the
display.
• Is the signal source device turned on? Turn on the device
and try again.
• Are there any loose cable connections? Make sure that all
cables are connected firmly.
• Have you chosen an unsupported output resolution on
the computer? Refer to
on page 44 to select a supported resolution and try again.
• Have you chosen an unsupported output resolution on
the DVD or Blu-ray disc player? Refer to
signal resolution on page 44
resolution and try again.
Check the following:
• Have you turned on the mute function on the display or
the input source device? Turn off the mute function or
increase the audio volume level and try again.
• Are there any loose cable connections? Make sure that all
cables are connected firmly.
• Have you chosen an unsupported output resolution on
the computer? Refer to
on page 44 to select a supported resolution and try again.
• Use the
Auto Adjustment
on page 36) to let the display automatically optimize the
display of computer image.
• If the result of the
satisfactory, use the
and functions to manually adjust the image.
V Position
Have you locked the control panel buttons? Unlock the
buttons and try again.
Solution
Supported input signal resolution
to select a supported
Supported input signal resolution
function (See Auto Adjustment
function is not
Auto Adjustment
,
Clock Frequency
Troubleshooting
Supported input
,
Phase H Position
55