Dell ST2220T Monitor - Manual (Page 31)

4. Ensure that the screen is looking normal.
5. Press the shortcut key 4 key on the front panel again. The color of the screen changes to red.
6. Repeat steps 5 to inspect the display in green, blue, black, and white colored screens.
The test is complete when the white screen appears. To exit, press the shortcut key 4 key again.
If you do not detect any screen abnormalities upon using the built-in diagnostic tool, the monitor is functioning properly. Check the video card and computer.
Common Problems
The following table contains general information about common monitor problems you might encounter and the possible solutions.
Common Symptoms What You See Possible Solutions
No Video/Power LED
off No picture l Ensure that the video cable connecting the monitor and the computer is properly connected and secure.
l Verify that the power outlet is functioning properly using any other electrical equipment.
No Video/Power LED
on No picture or no
brightness l Increase brightness & contrast controls via OSD.
l Perform monitor self-test feature check.
l Check for bent or broken pins in the video cable connector.
l Press Shortcut key 4 to call out the Input Select Source OSD menu. Select the correct input source.
l Run the built-in diagnostics.
Poor Focus Picture is fuzzy,
blurry, or ghosting l Perform Auto Adjust via OSD.
l Adjust the Phase and Pixel Clock controls via OSD.
l Eliminate video extension cables.
l Reset the monitor to Factory Settings.
l Change the video resolution to the correct aspect ratio (16:9).
Shaky/Jittery Video Wavy picture or fine
movement l Perform Auto Adjust via OSD.
l Adjust the Phase and Pixel Clock controls via OSD.
l Reset the monitor to Factory Settings.
l Check environmental factors.
l Relocate the monitor and test in another room.
Missing Pixels LCD screen has
spots l Turn off the monitor and then turn it back on.
l Pixel that is permanently off is a natural defect that can occur in LCD technology.
l Run the built-in diagnostics
Stuck-on Pixels LCD screen has
bright spots l Turn off the monitor and then turn it back on.
l Pixel that is permanently off is a natural defect that can occur in LCD technology.
l Run the built-in diagnostics
Brightness Problems Picture is too dim or
too bright
l Reset the monitor to Factory Settings .
l Auto Adjust via OSD.
l Adjust brightness & contrast controls via OSD.
Geometric Distortion Screen is not
centered correctly
l Reset the monitor to Factory Settings.
l Auto Adjust via OSD.
l Adjust brightness & contrast controls via OSD.
NOTE: When using 'DVI-D' or 'HDMI', the positioning adjustments are not available.
Horizontal/Vertical
Lines Screen has one or
more lines l Reset the monitor to Factory Settings.
l Perform Auto Adjust via OSD.
l Adjust Phase and Pixel Clock controls via OSD.
l Perform monitor self-test feature check and determine if these lines are also in self-test mode.
l Check for bent or broken pins in the video cable connector.
l Run the built-in diagnostics
NOTE: When using 'DVI-D' or 'HDMI', the Pixel Clock and Phase adjustments are not available.
Synchronization
Problems Screen is scrambled
or appears torn l Reset the monitor to Factory Settings.
l Perform Auto Adjust via OSD.
l Adjust Phase and Pixel Clock controls via OSD.
l Perform monitor self-test feature check to determine if the scrambled screen appears in self-test mode.
l Check for bent or broken pins in the video cable connector.
l Restart the computer in the safe mode.
Safety Related
Issues Visible signs of
smoke or sparks l Do not perform any troubleshooting steps.
l Contact Dell immediately.