Dell C7520QT - Common Display Problems Guide

60 | Troubleshooting
Common Problems
The following table contains general information about common display problems you might
encounter and the possible solutions:
NOTE: Auto Adjust function is applicable to VGA input only.
Common
Symptoms
What You
Experience
Possible Solutions
No Video/Power
LED off
No picture •Ensure that the video cable connecting the display
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 & contrast controls via OSD.
•Perform display 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.
Poor Focus Picture is fuzzy,
blurry, or ghosting
•Perform Auto Adjust via OSD.
•Adjust the Phase and Pixel Clock controls via OSD.
•Eliminate video extension cables.
•Reset the display to factory settings.
•Change the video resolution to the correct aspect ratio.
Shaky/Jittery Video Wavy picture or fine
movement
•Perform Auto Adjust via OSD.
•Adjust the Phase and Pixel Clock controls via OSD.
•Reset the display to factory settings.
•Check environmental factors.
•Relocate the display and test in another room.
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DisplayQuality
and Pixel Policy, see Dell Support site at:
http://www.dell.com/support/monitors.
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DisplayQuality
and PixelPolicy, see Dell Support site at:
http://www.dell.com/support/monitors.