Dell U4025QW UltraSharp 40 Curved Thunderbolt Hub Monitor - Users Guide - Page 98

Common Problems, Troubleshooting, Common, Symptoms, What you, experience, Possible solutions

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Common Problems The following table contains general information about common monitor problems that you might encounter and the possible solutions: Common Symptoms What you experience Possible solutions No video/power No picture LED off • 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 pressed fully. • Ensure that the correct input source is selected in the Input Source menu. No video/power No picture or no LED on brightness • Increase brightness and contrast controls using 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. • A 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/pixelguidelines. Stuck-on pixels LCD screen has bright spots • Cycle power on-off. • A 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/pixelguidelines. Brightness problems Picture too dim or too bright • Reset the monitor to factory settings. • Adjust brightness and contrast controls using OSD. 98 | Troubleshooting

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Troubleshooting
Common Problems
The following table contains general information about common monitor problems that
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 pressed
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
using 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.
• A 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/pixelguidelines
.
Stuck-on pixels
LCD screen has
bright spots
• Cycle power on-off.
• A 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/pixelguidelines
.
Brightness
problems
Picture too dim or
too bright
• Reset the monitor to factory settings.
• Adjust brightness and contrast controls
using OSD.