Dell U4021QW, Руководство пользователя

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72 | Troubleshooting
Common Problems
The following table contains general information about common monitor problems you
might encounter and the possible solutions:
Common
Symptoms What You
Experience Possible Solutions
No Video/
Power LED off No picture • Ensure that the video cable connecting the
monitor and the computer is properly connected
and secure.
• Verify that the power outlet is functioning
properly using any other electrical equipment.
• Ensure that the power button is depressed fully.
• Ensure that the correct input source is selected
in the Input Source menu.
No Video/
Power LED on No picture or no
brightness • Increase brightness and contrast controls via
OSD.
• Perform monitor self-test feature check.
• Check for bent or broken pins in the video cable
connector.
• Run the built-in diagnostics.
• Ensure that the correct input source is selected
in the Input Source menu.
Missing Pixels LCD screen has
spots • Cycle power on-off.
• Pixel that is permanently off is a natural defect
that can occur in LCD technology.
• For more information on Dell Monitor Quality
and Pixel Policy, see Dell Support site at:
www.dell.com/pixelguidelines .
Stuck-on Pixels LCD screen has
bright spots
• Cycle power On-Off.
• Pixel that is permanently off is a natural defect
that can occur in LCD technology.
• For more information on Dell Monitor Quality
and PixelPolicy, see Dell Support site at:
www.dell.com/pixelguidelines .
Brightness
Problems Picture too dim
or too bright • Reset the monitor to factory settings.
• Adjust brightness and contrast controls via OSD.
Safety Related
Issues Visible signs of
smoke or sparks • Do not perform any troubleshooting steps.
• Contact Dell immediately.