Dell UltraSharp 40 Curved U4025QW Monitor Usage and Troubleshooting Guide

Summary: This article provides information about how to set up and use the Dell UltraSharp 40 Curved U4025QW monitor. Learn how to troubleshoot common display or video issues with the Dell UltraSharp 40 Curved U4025QW monitor. ...

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Dell UltraSharp 40 Curved U4025QW Monitor

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Getting Started with your Dell UltraSharp 40 Curved U4025QW Monitor Dell UltraSharp 40 Curved U4025QW Monitor Setup, Specifications, and Service Manual Dell Drivers & Downloads Warranty and Support Services Frequently Asked Questions
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The key features of the Dell UltraSharp 40 Curved U4025QW monitor are:

  • 100.859 cm (39.7 in.) active area display (Measured diagonally) 5120 x 2160 (21:9) resolution, plus full-screen support for lower resolutions.
  • Wide viewing angles with 100% sRGB color, 99% DCI-P3, 100% BT.709 & 99% Display P3.
  • Tilt, swivel, height, and slant adjustment capabilities.
  • Integrated speakers (2 x 9 W).
  • Removable pedestal stand and Video Electronics Standards Association (VESA) 100 mm mounting holes for flexible mounting solutions.
  • Ultra-thin bezel minimizes the bezel gap in multi-monitor usage, enabling easier setup with an elegant viewing experience.
  • Digital connectivity with DisplayPort, Thunderbolt, and HDMI (supports up to 5K2K 5120 x 2160 120Hz FRL, HDR Static Metadata, VRR as per specified in HDMI 2.1.).
  • Thunderbolt 4 ports to supply power for compatible laptop up to 140 W while receiving Video and USB signal.
  • Thunderbolt 4 and RJ45 ports enable a single-cable, network-connected experience.
  • Plug-and-play capability if supported by your computer.
  • On-Screen Display (OSD) adjustments for ease of set-up and screen optimization.
  • Power button and OSD menu lock.
  • Security-lock slot.
  • Stand lock.
  • Power consumption ≤0.3 W in Standby Mode (DisplayPort or HDMI port and without upstream port connector).
  • This monitor supports VRR (Variable refresh rate) function, get higher frame rates and help reduce screen tearing in games.
  • This monitor supports DRR (Dynamic refresh rate) function. DRR works with Windows 11, allowing you to experience smoother text scroll and mouse cursor movement.
  • Supports Dell Text to Speech (English) device.
  • Supports Picture by Picture (PBP) and Picture in Picture (PIP) Select mode.
  • Supports internal Multi-Stream Transport (MST) function (Screen Partition item in OSD) for DP port and Thunderbolt™ 4 (Video + Data).
  • Allows you to switch USB KVM function in PBP/PIP mode.
  • The monitor is designed with a Dell Power Button Sync (DPBS) feature to control PC system power state from a monitor power button.*

*Dell system that supports DPBS is listed in the Dell website. DPBS function can be enabled in the OSD menu under Display.

* For Dell systems that support this feature.
** This monitor is in compliance with TÜV Rheinland hardware low blue light certification under Category 2.

  • Premium Panel Exchange for peace of mind.
  • Optimize eye comfort with a flicker-free screen and low blue light feature to minimize hazard of blue light emission.
  • Dell ComfortView Plus is an integrated low blue light screen feature that improves eye comfort by reducing potentially harmful blue light emissions without compromising color. Through ComfortView Plus technology, Dell has reduced harmful blue light exposure from ≤50% to ≤35%. This monitor is certified with TÜV Rheinland Eye Comfort 3.0 with a 5-star rating. It incorporates key technologies that also deliver a flicker-free screen, up to 120 Hz refresh rate, a color gamut of minimum 95% DCI-P3, color accuracy, and ambient light sensor performance. Dell ComfortView Plus feature is enabled by default on your monitor.
  • This monitor uses a low blue light panel. When the monitor is reset to factory settings or default setting, it is in compliance with TÜV Rheinland’s hardware low blue light certification.**
    Blue light ratio:
    The ratio of light in the range from 415nm-455nm compared to 400nm-500nm should be less than 50%.
    Category Blue light ratio
    1 < 20%
    2 20% < R < 35%
    3 35% < R < 50%
  • Decreases the level of hazard blue light emitted from the screen to make viewing more comfortable for your eyes without distortion of color accuracy.
  • The Monitor adopts Flicker-Free technology, which clears the eye visible flicker, brings comfort viewing experience and preventing users suffer from eye strain and fatigue.

This section provides some technical specifications of the Dell UltraSharp 40 Curved U4025QW monitor. For more information, see the user manual of the Dell UltraSharp 40 Curved U4025QW monitor.

Table 1: Technical specifications of the Dell UltraSharp 40 Curved U4025QW monitor
Screen type
  • Active matrix - TFT LCD
Panel technology
  • In-Plane Switching Technology
Aspect ratio
  • 21:9
Viewable image
  • Diagonal: 1008.59 mm (39.7 in.)
  • Horizontal (active area): 929.28 mm (36.59 in.)
  • Vertical (active area): 392.04 mm (15.43 in.)
  • Area: 364314.9 mm2 (564.69 in.2)
Pixel pitch
  • 0.1815 mm x 0.1815 mm
Pixel per inch (PPI)
  • 140
Viewing angle
  • 178° (vertical) typical
  • 178° (horizontal) typical
Luminance output
  • 450 cd/m² (typical)
    600 cd/m² (HDR Peak)
Contrast ratio
  • 2000 to 1 (typical)
Curvature
  • 2500R
Display screen coating
  • Anti-Glare with 3H hardness
Backlight
  • LED Edgelight System
Response Time (Gray to Gray)
  • 5 ms (Fast mode)
  • 8 ms (Normal mode)
Color depth
  • 1.07 Billion colors (8bit + A-FRC)*
Color gamut**
  • sRGB 100%
  • BT.709 100%
  • DCI-P3 99%
  • Display P3 99%
Calibration accuracy
  • DCI-P3, Display P3, sRGB & BT.709:
    Delta E < 2 (Average)
Connectivity
  • 1 x HDMI (supports up to 5K2K 5120 x 2160 120Hz FRL, HDR Static Metadata, VRR as per specified in HDMI 2.1.)
  • 1 x DP 1.4 (HDCP 2.3) (Support up to 5120 x 2160 120 Hz, HDR, DSC)
  • 1 x Thunderbolt 4 downstream port (15 W) for daisy chaining (Video + Data)
  • 1 x Thunderbolt 4 (140 W) (Alternate mode with DisplayPort 1.4, SuperSpeed USB 3.2 Gen2 (10 Gbps) upstream port, USB Power Delivery up to 140 W)
  • 1 x USB Type-C upstream port (data only) (SuperSpeed USB 10 Gbps, USB 3.2 Gen2)
  • 4 x USB Type-A downstream port (SuperSpeed USB 10 Gbps, USB 3.2 Gen2)
  • 1 x Audio line-out port
  • 1 x RJ45 (2.5GbE) port
  • 1 x USB Type-A downstream port (SuperSpeed USB 10 Gbps, USB 3.2 Gen2) with BC1.2 power charging
  • 2 x USB Type-C downstream port (SuperSpeed USB 10 Gbps, USB 3.2 Gen2) with power charging (15W)
Border width (edge of monitor to active area)
  • 11.30 mm (Top)
  • 11.30 mm (Left/Right)
  • 15.80 mm (Bottom)
Adjustability
  • Height adjustable stand: 150 mm
  • Tilt: -5° to 21°
  • Swivel: -30° to 30°
 
Note: Do not mount or use this monitor in portrait (vertical) orientation or inverse (180°) landscape mount as it may damage the monitor.
Cable management
  • Yes
Dell Display Manager compatibility
  • Easy Arrange and other key features.
Security
  • Security-lock slot (cable lock sold separately)

For the best viewing experience, assemble the monitor stand, connect and organize the cables, and set up the monitor ergonomically.

Attaching the stand

The standard monitor stand is detached when it is shipped from the factory. To learn how to attach the standard monitor stand, see the user manual of the Dell UltraSharp 40 Curved U4025QW monitor.

To learn how to set up any other monitor stand or monitor arm, see the setup guide of the product.

CAUTION: Do not remove the monitor from the packaging box before attaching the stand.
NOTE: The Dell UltraSharp 40 Curved U4025QW monitor is heavy, handle with extreme care. We recommend having two people lift or move this monitor.

Ergonomics

Where you put your monitor is almost as important as what model you buy.

  • The monitor must be directly in front of you, at an arm’s length away (between 20-40 inches from your eyes).
  • The top edge of the screen must be set at eye level when you are sitting comfortably. Adjust your chair height or the height of the monitor to achieve this.

Connecting your monitor to the computer

To connect your Dell UltraSharp 40 Curved U4025QW monitor to your computer:

WARNING: Read and follow Safety Precautions When Working with Electronic and Electrical Equipment.
NOTE: Dell UltraSharp 40 Curved U4025QW supports display over USB-C port with Alternate mode DP 1.4. Ensure that the USB-C port on your computer supports Alternate mode DP 1.2 or above.
  1. Turn off the computer.
  2. Connect the power cable to the monitor.
  3. Connect the video cable (USB-C, DisplayPort, or HDMI) between the computer and the monitor.
    NOTE: Setting up the monitor with a Dell docking station? Learn How to Connect and Set Up a Docking Station With a Dell Laptop.
    NOTE: Setting up more than one monitor? Learn How to Set up Multiple Monitors or see the user manual of the Dell UltraSharp 40 Curved U4025QW monitor.
  4. Connect the USB upstream cable between the monitor and computer (if available).
  5. Turn on the monitor.
  6. Turn on the computer.

For additional product-specific information, see the user manual of the Dell UltraSharp 40 Curved U4025QW monitor.

Dell UltraSharp 40 Curved U4025QW monitor orientation must always be in landscape mode. This includes any wall-mounted monitors, monitors on a stand, or a monitor arm. In a multiple monitor setup, the Dell UltraSharp 40 Curved U4025QW monitor must not be rotated either to 180° (landscape) or 90° (portrait).

CAUTION: Dell UltraSharp 40 Curved U4025QW setup must comply with the recommended panel orientation and working angle only. Setting up the monitor in an orientation that is not recommended may damage the monitor, cause a safety hazard, or both.

When setting up your Dell UltraSharp 40 Curved U4025QW monitor, ensure that the front panel buttons are at the bottom right.

Using the tilt, swivel, and vertical extension

WARNING: Do not rotate the monitor to 180° (landscape). Do not set the monitor orientation at 90° (portrait).
NOTE: This is applicable for a monitor with a stand. For other stands, see the respective stand setup guide.

The monitor stand allows you to tilt and swivel the monitor to set the most comfortable viewing angle.

Dell UltraSharp 40 Curved U4025QW Tilt and Swivel
Figure 1: Using Tilt and Swivel on a Dell UltraSharp 40 Curved U4025QW monitor.

Monitors that are mounted on a wall or monitor arm must conform to the recommended panel orientation and working angle.

Dell UltraSharp 40 Curved U4025QW Vertical Extention
Figure 2: Orientation of Dell UltraSharp 40 Curved U4025QW monitor

Use the joystick at the rear of the monitor to access the On-Screen Display (OSD) menu of the monitor. To access the On-Screen Display (OSD) menu, press joystick at the rear of the monitor.

Use the joystick at the rear of the monitor to access the On-Screen Display (OSD) menu of the monitor. To access the On-Screen Display (OSD) menu, press joystick at the rear of the monitor. Learn more about using the On-Screen Display (OSD) menu. See the user manual of the Dell UltraSharp 34 Curved U3425WE monitor.

NOTE: The monitor automatically saves any changes that you make. Whenever you move to another menu item, exit the OSD menu, or wait for the OSD menu to automatically close.

Dell UltraSharp 34 Curved U3425WE Monitor Power Button and OSD Joystick
Figure 3: Dell UltraSharp 40 Curved U4025QW monitor Power button and OSD joystick.

Table 2: Buttons on the Dell UltraSharp 34 Curved U3425WE monitor
Button Function Description
1. Power Button Power On/Off button (with LED indicator on front of the monitor). Solid white light indicates that the monitor is On and fully functional. Blinking white light indicates the power save mode.
2. Joystick Control Controls to make adjustments to the On-Screen Display.
  • Press the joystick to launch the Menu Launcher.
  • Move the joystick up/down/left/right to toggle between options.
  • Press the joystick again to confirm the selection.

Resetting a monitor to factory defaults can help resolve many video or display issues. To reset your Dell UltraSharp 40 Curved U4025QW monitor to factory default settings, follow these instructions:

  1. Press on the joystick on the monitor to enter the On-Screen Display (OSD) Menu.
  2. Press up or down on the joystick to highlight Others option in the menu and press on the joystick to select.
  3. Press up or down to highlight Factory Reset option in the menu and press on the joystick to select.
  4. Press on the joystick to confirm the reset action.

Dell UltraSharp 40 Curved U4025QW Monitor Reset Screen
Figure 4: Dell UltraSharp 40 Curved U4025QW monitor reset screen

A diagnostic test helps determine if the Dell monitor is normal when faced with a blank screen, blurry image, flickering or other abnormalities.

Verify that the monitor is working correctly by running a diagnostic test if you experience the following symptoms.

  • Your computer does not turn on or shows any sign of power.
  • Your computer does not show any indication of activity, the screen is blank and does not display the Dell logo during start-up.
  • Your computer gets stuck at the Dell logo screen or does not respond to any keys during start-up.
  • You cannot see any display on the screen.
  • You hear the windows chime, but the monitor screen is blank.

Self-Test Feature Check

Your Dell UltraSharp 40 Curved U4025QW monitor provides a self-test feature check that allows you to check if the monitor is functioning properly. When the monitor is connected to the computer but the screen stays dark, run the monitor self-test by following these steps:

  1. Turn off the computer and the monitor.
  2. Unplug the video cable from the back of the computer. To ensure proper self-test operation, disconnect the video cable (VGA, DVI, HDMI, DisplayPort, or USB-C cable) from the back of the computer.
  3. Turn on the monitor. A floating dialog box should appear on-screen (against a black background), if the monitor cannot sense a video signal and is working correctly. While in self-test mode, the power LED remains white. Also, depending upon the selected input, the dialog box scrolls through the screen.
  4. This box also appears during normal system operation, if the video cable becomes disconnected or damaged.
  5. Turn off the monitor and reconnect the video cable.
  6. Turn on the computer and the monitor.

If the screen remains blank, check the video card (GPU) and computer, because the monitor is functioning properly.

Built-In Self-Test or Built-In Diagnostics

Your Dell UltraSharp 40 Curved U4025QW monitor has an integrated diagnostic tool. Hardware diagnostic helps determine if the screen abnormality issue is with the monitor or the video card on your computer.

If you observe any screen anomalies, you should isolate the monitor by performing the built-in diagnostics (BID).

  1. Ensure that the screen is clean (no dust particles on the surface of the screen).
  2. Move or press the joystick to launch the Menu Launcher.
  3. Move the joystick up to select the page icon and open the Main Menu.
  4. Move the joystick to navigate and select Others and then Self-Diagnostic.
  5. Press the joystick to initiate the built-in diagnostics. A gray screen is displayed.
  6. Observe if the screen has any defects or abnormalities.
  7. Toggle the joystick once again until a red screen is displayed.
  8. Observe if the screen has any defects or abnormalities.
  9. Repeat steps 7 and 8 until the screen displays green, blue, black, and white colors. Note any abnormalities or defects.

If you do not detect any screen abnormalities in the diagnostics test, the monitor is functioning properly. Check the video card (GPU) and the computer.

If you notice any abnormalities in the diagnostics test, contact Dell Technical Support for repair options.

During the manufacturing process, it is not uncommon for one or more pixels to get stuck in an unchanging state. Such pixel issues are hard to see and do not affect the display quality or usability. Learn more about Dell Display Pixel Guidelines.

The following table contains information about troubleshooting common display-related issues on your Dell UltraSharp 40 Curved U4025QW monitor.

Alternatively, learn How to Troubleshoot Display or Video Issues on a Dell Monitor or check our Dell monitor self-help guide.

The following table contains monitor specific issues on your Dell UltraSharp 40 Curved U4025QW monitor.

Table 3: Troubleshooting common display issues on Dell UltraSharp 40 Curved U4025QW monitor.
Common Problem What User Experiences Possible Solution
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.
Missing Pixels LED screen has spots.
  • Cycle power On-Off.
  • A pixel that is permanently off is a natural defect that can occur in LED technology.
  • For more information about Dell Monitor Quality and Pixel Policy, see Dell.com/Pixelguidelines.
Stuck On Pixels LED screen has bright spots.
  • Cycle power On-Off.
  • A pixel that is permanently off is a natural defect that can occur in LED technology.
  • For more information about Dell Monitor Quality and Pixel Policy, see Dell.com/Pixelguidelines.
Brightness Problems Picture too dim or too bright.
Safety-Related Issues Visible signs of smoke or sparks.
Intermittent Problems The monitor malfunctions on and off.
Missing Color The picture does not have color.
  • Run the monitor self-test feature check.
  • Ensure that the video cable connecting the monitor to the computer is connected properly and is secure.
  • Check for bent or broken pins in the video cable connector.
Wrong Color Picture color is not good.
  • Change the settings of the Preset Modes in the Color menu OSD depending on the application.
  • Adjust the Gain/Offset/Hue/Saturation values under Custom Color in the Color menu OSD.
  • Change the Input Color Format to RGB or YCbCr/YPbPr in the Display settings OSD.
  • Run the built-in diagnostics.
Image retention from a static image left on the monitor for a long period of time.

A faint shadow from the static image displayed appears on the screen.
  • Set the screen to turn off after a few minutes of screen idle time. These can be adjusted in the Windows Power Options or Mac Energy Saver setting.
  • Alternatively, use a dynamically changing screensaver.
TBT out cannot display TBT out port connects the 2nd Monitor cannot display, but the display setting can recognize 2 monitor.
  • Make sure the OSD Thunderbolt Daisy Chain is "Optimized.”
  • Open the display setting in NB/PC, if you can see NB/PC and 1st monitor, select 2nd only, the 2nd monitor should be display.
The monitor cannot detect signal connect with dock after AC/DC Off/On, cable uplug/Plug Connect the Dock USB-C cable to the platform. Connect DUT with TBT4 cable to the Dock USB-C port. The monitor cannot detect the signal after AC Off/On TBT4 cable Unplug/Plug
  • Connect the monitor directly with the platform.
  • Change the TBT4 cable to a USB-C cable.
The two monitor maximum resolution cannot reach 5120 x 2160 @ 120 Hz when TBT Daisy Chain Connect 1st DUT with TBT4 cable to the platform. Connect 2nd DUT to the 1st DUT ThunderboltTM out port with TBT4 cable. The 2nd monitor or 1st monitor cannot reach 5120 x 2160 @120 Hz. Make sure the OSD Thunderbolt Daisy Chain is "Optimized".
2nd monitor shows black screen when TBT daisy chain and enable SmartHDR on both OSD and Windows display setting Connect 1st DUT with TBT4 cable to the platform. Connect 2nd DUT to the 1st DUT Thunderbolt out port with TBT4 cable. Set both DUT to the maximum resolution (5120 x 2160). Enable SmartHDR on both OSD and Windows display setting. 2nd monitor shows black screen.
  • Intel UHD graphic limitation, suggest using Intel Iris graphic.
  • Disable SmartHDR on both OSD and Windows display setting.
Auto source cannot automatically switch to DP input source when you connect the DP cable to the platform When you connect the HDMI cable and DP cable to monitor, connect HDMI cable to platform and display normally, then connect DP cable to platform. The signal cannot automatically to DP signal.
  • Unplug and plug the DP cable from the monitor side.
  • Go to the OSD menu and enter input source select DP manually.
Table 4: Troubleshooting Dell UltraSharp 40 Curved U4025QW monitor specific issues.
Specific Symptoms What you experience Possible Solution
The screen image is too small. The image is centered on the screen, but does not fill the entire viewing area.
Cannot adjust the monitor with the joystick OSD does not appear on the screen.
  • Turn off the monitor, unplug the power cable, plug it back, and then turn on the monitor.
  • Check whether the OSD menu is locked. If yes, move and hold the joystick forward/back/left/right for 4 seconds to unlock. For more information, see the Locking control buttons.
No Input Signal when user controls are pressed. No picture, the power LED light is white.
  • Check the signal source. Ensure that the computer is not in power-saving mode by moving the mouse or pressing any key on the keyboard.
  • Check whether the signal cable is plugged in properly. Re-plug the signal cable if necessary.
  • Reset the computer or video player.
The picture does not fill the entire screen The picture cannot fill the height or width of the screen.
No image when using DP connection to the PC Blank screen Verify which DP standard is your Graphics card is certified to. Download and install the latest graphics card driver.
No image when using Thunderbolt 4 connection to computer, laptop, and so on Blank screen
  • Verify if the Thunderbolt 4 interface of the device can support DP alternate mode.
  • Verify if the device required more than EPR 140W power charging.
  • Set Windows to Projection mode.
  • Ensure that the Thunderbolt 4 cable is not damaged.
No charging when using Thunderbolt 4 connection to computer, laptop, and so on No charging
  • Verify if the device can support one of the 5 V/9 V/15 V/20 V/28 V charging profiles.
  • Verify if the Notebook requires a >EPR 140W power adapter
  • •If the Notebook requires a >EPR 140W power adapter, it may not charge with the ThunderboltTM 4 connection.
  • Ensure that you use only the Dell approved adapter or the adapter that comes with the product.
  • Ensure that the Thunderbolt 4 cable is not damaged.
Intermittent charging when using Thunderbolt 4 connection to computer, laptop, and so on Intermittent charging
  • Check if the maximum power consumption of the device is over EPR 140 W.
  • Ensure that you use only the Dell approved adapter or the adapter that comes with the product.
  • Ensure that the ThunderboltTM 4 cable is not damaged.
No network connection Network dropped or Intermittent
  • Do not toggle Off/On the power button when the network is connected, keeps the power button On.
The LAN port is not functioning Operating system setting or cable connection issue
  • Ensure that the latest BIOS and drivers for your computer are installed on your computer.
  • Ensure that the RealTek 2.5G Ethernet Controller is installed in the Windows Device Manager.
  • If your BIOS Setup has a LAN/GBE Enabled/Disabled option, make sure it is set to Enabled.
  • Ensure that the Ethernet cable is connected securely on the monitor and the hub/router/firewall.
  • Check the status LED of the Ethernet cable to confirm connectivity. Reconnect both ends of the Ethernet cable if the LED is not lit.
  • First power off the Computer and unplug the ThunderboltTM 4 cable and power cable of the monitor. Then power on the computer, plug in the monitor power cable and Thunderbolt 4 cable.
The detected light level drops significantly When the Ambient Light Sensor is on, the detected ambient light drops significantly
  • Check whether an object is obstructing the sensor area.
  • Ensure that a webcam is not mounted over the sensor area.
  • Wipe clean any dust that may be covering the sensor area.
  • Ensure that the display is not pivoted and placed to another monitor side by side.
Table 4: Troubleshooting USB issues on Dell UltraSharp 40 Curved U4025QW monitor.
Troubleshooting USB Issues
Specific Symptoms What User Experiences Possible Solution
USB interface is not working. USB devices are not working.
  • Check that your monitor is turned On.
  • Reconnect the upstream cable to your computer.
  • Reconnect the USB devices (downstream connector).
  • Switch Off and then turn On the monitor again.
  • Reboot your computer.
  • Some USB devices like external portable HDD require a higher electric current; connect the device directly to the computer system.
SuperSpeed USB 3.2 Gen2 interface is slow. SuperSpeed USB 3.2 Gen2 peripherals working slowly or not working at all
  • Check that your computer is USB 3.0-capable.
  • Some computers have USB 3.0, USB 2.0, and USB 1.1 ports. Ensure that the correct USB port is used.
  • Reconnect the upstream cable to your computer.
  • Reconnect the USB peripherals (downstream connector).
  • Reboot your computer.
Wireless USB peripherals stop working when a USB 3.0 device is plugged in Wireless USB peripherals responding slowly or only working as the distance between themselves and their receiver decreases
  • Increase the distance between the USB 3.0 peripherals and the wireless USB receiver.
  • Position your wireless USB receiver as close as possible to the wireless USB peripherals.
  • Use a USB-extender cable to position the wireless USB receiver as far away as possible from the USB 3.0 port.

Frequently Asked Questions

For more information, click to expand a section below.

NOTE: If you do not see the recommended resolution as an option, update the video card (GPU) driver of your Dell computer from https://www.dell.com/support/home/en-us or the video card (GPU) manufacturer's website. Learn How to Download and Install Dell Drivers.

Using Windows Display Settings

In Windows 11, Windows 10, Windows 8 or 8.1, and Windows 7:

  1. For Windows 8 and Windows 8.1 only, select the Desktop tile to switch to the classic desktop view.
  2. Right-click the desktop and click Screen Resolution.
  3. Click the dropdown list of the Screen Resolution and select 5120 x 2160.
  4. Click OK.

Using NVIDIA Control Panel

To change the resolution using the NVIDIA Control Panel:

  1. Right-click the desktop and click NVIDIA Control Panel.
  2. Click the + symbol next to Display on the left pane.
  3. Select Change Resolution under Display.
  4. In the dropdown menu on the right pane, select the resolution 5120 x 2160.
  5. Click Apply.

Using AMD Catalyst Control Center

To change the resolution using the AMD Catalyst Control Center:

  1. Right-click the desktop and click AMD Catalyst Control Center.
  2. Click the + symbol next to Display on the left pane.
  3. Select Change Resolution under Display.
  4. In the dropdown menu on the right pane, select the resolution 5120 x 2160.
  5. Click Apply.

The Dell UltraSharp 40 Curved U4025QW monitor has two built-in diagnostics that are available:

  • Self-Test Feature Check - The self-test feature check on the Dell UltraSharp 40 Curved U4025QW monitor allows you to check whether the monitor is functioning properly.

  • Built-In Self-Test - The Dell UltraSharp 40 Curved U4025QW monitor has a built-in self-test that helps you identify if the screen abnormality is with the monitor or the video card (GPU) on your computer. When you notice screen abnormalities such as distortion, clarity, horizontal or vertical lines, color fade. It is always a good practice to isolate the monitor by running the built-in diagnostics.

Learn how to run a diagnostic test on the Dell UltraSharp 40 Curved U4025QW monitor.

The troubleshooting section of this article provides information about troubleshooting common issues with your Dell UltraSharp 40 Curved U4025QW monitor.

This section has troubleshooting steps on how to resolve power issues, video issues, color or clarity issues, distortion issues, horizontal or vertical lines, brightness issues or pixel issues, and so on.

Learn how to access the on-screen display (OSD) menu on the Dell UltraSharp 40 Curved U4025QW monitor. For additional product-specific information, see the user manual of the Dell UltraSharp 40 Curved U4025QW monitor.

Information about the monitor such as the model number, firmware version, and Service Tag can be accessed using the on-screen display (OSD) menu of the monitor.

Learn how to access the on-screen display (OSD) menu on the Dell UltraSharp 40 Curved U4025QW monitor. For additional product-specific information, see the user manual of the Dell UltraSharp 40 Curved U4025QW monitor.

Dell UltraSharp 40 Curved U4025QW supports both DisplayPort 1.4 and 1.2 connectivity with your computer. If the video or graphics card (GPU) on your computer supports DisplayPort 1.2, it is required to change the monitor to DisplayPort 1.2 mode.

NOTE: The default factory setting on the Dell UltraSharp 40 Curved U4025QW is DisplayPort 1.4 (DP1.4).
  1. Press on the joystick on the monitor to enter the On-Screen Display (OSD) Menu.
  2. Press up or down to highlight Input Source in the menu and press on the joystick to select.
  3. Press up or down to highlight DP in the menu.
  4. Press and hold on the joystick for approximately 10 seconds until the DisplayPort configuration message appears.
  5. Press on the joystick to select Disable and change the display mode to DisplayPort version 1.2.

Dell UltraSharp 40 Curved U4025QW supports both HDMI 2.0 and HDMI 1.4 connectivity with your computer. If the video or graphics card (GPU) on your computer supports HDMI 1.4, it is required to change the monitor to HDMI 1.4 mode.

NOTE: The default factory setting on the Dell UltraSharp 40 Curved U4025QW is HDMI 2.0.
  1. Press on the joystick on the monitor to enter the On-Screen Display (OSD) Menu.
  2. Press up or down to highlight Input Source in the menu and press on the joystick to select.
  3. Press up or down to highlight HDMI in the menu.
  4. Press and hold on the joystick for approximately 10 seconds until the HDMI configuration message appears.
  5. Press on the joystick to select Disable and change the display mode to HDMI version 1.4.

The USB-C port on your Dell UltraSharp 40 Curved U4025QW supports USB Power Delivery, Data, and DisplayPort video signal. The USB-C port can be used for video and data signals, and supply power (90 W) to a compatible laptop using a single USB-C cable that is provided with the monitor.

NOTE: Dell UltraSharp 40 Curved U4025QW can supply power using the USB-C cable only to a compatible laptop that supports Power Delivery (PD) over USB-C. Not all laptops with USB-C support Power Delivery. For more information, see the user manual or contact the laptop manufacturer.
NOTE: USB-C power delivery-compliant port (PD version 2.0) delivers up to 90 W of power. If your laptop requires more than 90 W to operate and the battery is drained. It is recommended you use the standard AC adapter of the laptop to power on and charge the laptop battery.

If you are using a Dell laptop that supports charging using USB-C, Dell Technologies recommends installing the latest BIOS and video card (GPU) driver. Learn How to Download and Install Dell Drivers.

 

Affected Products

Dell U4025QW
Article Properties
Article Number: 000223142
Article Type: How To
Last Modified: 14 Mar 2024
Version:  1
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