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Dell Thunderbolt U4025QW User Manual

Dell Thunderbolt U4025QW
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98 | 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 o 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 o 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.

Table of Contents

Questions and Answers:

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Dell Thunderbolt U4025QW Specifications

General IconGeneral
Screen Size40 inches
Aspect Ratio21:9
Panel TypeIPS Black
Refresh Rate60 Hz
Color Support1.07 billion colors
Curvature2500R
VESA Mount100 x 100 mm
KVM SwitchYes
Resolution5120 x 2160
Brightness300 cd/m²
Contrast Ratio1000:1
Response Time5 ms
Color Gamut98% DCI-P3
PortsRJ45
Speakers2 x 9W
Built-in MicrophoneYes
Stand AdjustabilityHeight, Tilt, Swivel
Weight (with stand)14.4 kg

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