Dell U4025QW User Manual

6. Trouble Shooting Instructions
Built-in diagnostics
Your monitor has a built-in diagnostic tool that helps you determine if the screen
abnormality you are experiencing is an inherent problem with your monitor, or with your
computer and video card.
To run the built-in diagnostics:
1. Ensure that the screen is clean (no dust particles on the surface of the screen).
2. Press and hold Up or Down or Left or Right direction for four seconds until a
menu appears on the screen.
3. Using the joystick control, highlight the Diagnostics option and press the
joystick button to start the diagnostics. A gray screen is displayed.
4. Observe if the screen has any defects or abnormalities.
5. Toggle the joystick once again until a red screen is displayed.
6. Observe if the screen has any defects or abnormalities.
7. Repeat steps 5 and 6 until the screen displays green, blue, black, and white
colors. Note any abnormalities or defects.
The test is complete when a text screen is displayed. To exit, toggle the joystick control
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.

Dell U4025QW Specifications

General

Screen Size	40 inches
Resolution	5120 x 2160
Aspect Ratio	21:9
Panel Type	IPS Black
Refresh Rate	60 Hz
Brightness	300 cd/m²
Color Support	1.07 billion colors
Color Gamut	100% sRGB, 98% DCI-P3
USB Hub	Yes
Built-in Speakers	Yes
VESA Mount Compatible	Yes (100 x 100 mm)
Curvature	2500R
Contrast Ratio	2000:1
Response Time	5ms (GtG)
Ports	HDMI, DisplayPort, USB-C
Connectivity	Thunderbolt 4, DisplayPort 1.4, HDMI 2.1, USB-C, USB-A