Common Problems - Dell S2421HS Simplified Service Manual

Common problems

The following table contains general information about common monitor problems you
might encounter and the possible solutions.
Common What You
Symptoms Experience
No video/ No picture
Power LED off
No video/ No picture or no
Power LED on brightness
Missing pixels LCD screen has
spots
Stuck-on pixels LCD screen has
bright spots
Brightness Picture too dim
problems or too bright
Safety-related Visible signs of
issues smoke or sparks
5. Trouble Shooting Instructions
Possible Solutions
• 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
• Increase brightness and contrast controls
through 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
• Cycle power on-off.
• Pixel that is permanently off is a natural defect
that can occur in LCD technology.
• For more information about Dell Monitor Quality
and Pixel Policy, see Dell Support site at:
https://www.dell.com/support/monitors.
• Cycle power on-off.
• Pixel that is permanently off is a natural defect
that can occur in LCD technology.
• For more information about Dell Monitor Quality
and PixelPolicy, see Dell Support site at:
https://www.dell.com/support/monitors.
• Reset the monitor to factory settings.
• Adjust brightness and contrast controls through
OSD.
• Do not perform any troubleshooting steps.
• Contact Dell immediately.
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