Dell S2240Tb Computer Monitor User Manual


 
46 | Troubleshooting
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 monitor to Factory Settings.
Change the video resolution to the correct aspect ratio
(16:9).
Shaky/Jittery
Video
Wavy picture or
fine movement
Perform Auto Adjust via OSD.
Adjust the Phase and Pixel Clock controls via OSD.
Reset the monitor to Factory Settings.
Check environmental factors.
Relocate the monitor 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 Monitor Quality and Pixel
Policy, see Dell Support site at: support.dell.com.
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 Pixel
Policy, see Dell Support site at: support.dell.com.
Brightness
Problems
Picture too dim
or too bright
Reset the monitor to Factory Settings.
Auto Adjust via OSD.
Adjust brightness & contrast controls via OSD.
Geometric
Distortion
Screen not
centered
correctly
Reset the monitor to Factory Settings.
Auto Adjust via OSD.
Adjust horizontal & vertical controls via OSD.
NOTE: When using DVI-D/HDMI input, the positioning
adjustments are not available.
Horizontal/
Vertical Lines
Screen has one
or more lines
Reset the monitor to Factory Settings.
Perform Auto Adjust via OSD.
Adjust Phase and Pixel Clock controls via OSD.
Perform monitor self-test feature check and determine if
these lines are also in self-test mode.
Check for bent or broken pins in the video cable connector.
Run the built-in diagnostics.
NOTE: When using DVI-D/HDMI input, the Pixel Clock and
Phase adjustments are not available.
Synchronization
Problems
Screen is
scrambled or
appears torn
Reset the monitor to Factory Settings.
Perform Auto Adjust via OSD.
Adjust Phase and Pixel Clock controls via OSD.
Perform monitor self-test feature check to determine if the
scrambled screen appears in self-test mode.
Check for bent or broken pins in the video cable connector.
Restart the computer in the safe mode.