Dell UltraSharp 34 Curved USB-C Hub Monitor - U3421WE User’s Guide Model: U3421WE Regulatory model: U3421WEb
NOTE: A NOTE indicates important information that helps you make better use of your computer. CAUTION: A CAUTION indicates potential damage to hardware or loss of data if instructions are not followed. WARNING: A WARNING indicates a potential for property damage, personal injury, or death. Copyright © 2020 Dell Inc. or its subsidiaries. All rights reserved. Dell, EMC, and other trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be trademarks of their respective owners.
Contents About your monitor . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Package contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Product features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Identifying parts and controls . . . . . . . . . . . . . . . . . . . . . . 9 Front view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Back view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting up the monitor . . . . . . . . . . . . . . . . . . . . . . .27 Attaching the stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Connecting your monitor . . . . . . . . . . . . . . . . . . . . . . . . . 30 Connecting the DisplayPort (DisplayPort to DisplayPort) cable. . 30 Connecting the HDMI cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Connecting the USB Type-C cable . . . . . . . . . . . . . . . . . . . . . . . .
Always On USB Type-C Charging . . . . . . . . . . . . . . . . . . Common problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product specific problems . . . . . . . . . . . . . . . . . . . . . . . . Universal Serial Bus (USB) specific problems . . . . . . . . . Speakers Specific Problems . . . . . . . . . . . . . . . . . . . . . . 72 72 76 77 79 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 FCC notices (U.S. only) and other regulatory information. . . . .
About your monitor Package contents Your monitor ships with the components shown in the table below. If any component is missing, contact Dell technical support. For more information, see Contact Dell. NOTE: Some items may be optional and may not ship with your monitor. Some features may not be available in certain countries. NOTE: If you are attaching a stand that you purchased from any other source, follow the set up instructions that were included with the stand.
Power cable (varies by country) DisplayPort cable (DP to DP) HDMI cable USB Type-C cable Super speed USB 5 Gbps (USB 3.
Product features The Dell U3421WE monitor has an active matrix, Thin-Film Transistor (TFT), Liquid Crystal Display (LCD) and LED backlight. The monitor features include: • 86.72 cm (34.14 in.) viewable area (measured diagonally). 3440 x 1440 (21:9) resolution, plus full-screen support for lower resolutions. • Wide viewing angle to allow viewing from a sitting or standing position. • Color gamut of sRGB 99% and Rec 709 99% with an average Delta E < 2; also supports DCI-P3 95%.
• Optimize eye comfort with a flicker-free screen. WARNING: The possible long-term effects of blue light emission from the monitor may cause damage to the eyes, including eye fatigue, digital eye strain, and so on. ComfortView feature is designed to reduce the amount of blue light emitted from the monitor to optimize eye comfort. Identifying parts and controls Front view Label 1 Description Power LED indicator Use Solid white light indicates that the monitor is turned on and functioning normally.
Back view Back view with monitor stand Label Description Use 1 VESA mounting holes (100 mm x 100 mm - behind attached VESA Cover) Wall mount monitor using VESAcompatible wall mount kit (100 mm x 100 mm). 2 Regulatory label Lists the regulatory approvals. 3 Stand release button Releases stand from the monitor. 4 Barcode, serial number, and Service Tag label Refer to this label if you need to contact Dell for technical support. 5 Power On/Off button To turn the monitor on or off.
Bottom view Bottom view without monitor stand Label Description Use 1 Security lock slot Secures the monitor with security lock (security lock not included). 2 Power connector Connect the power cable (shipped with your monitor). 3 HDMI port (2) Connect your computer with the HDMI cable. 4 Stand lock feature To lock the stand to the monitor using a M3 x 6 mm screw (screw not included). 5 DisplayPort Connect your computer with the DisplayPort cable.
6 USB Type-C upstream port Connect the USB Type-C cable that came with your monitor to the computer or mobile device. This port supports USB Power Delivery, Data, and DisplayPort video signal. The super speed USB 5 Gbps (USB 3.2 Gen1) Type-C port offers the fastest transfer rate and the alternate mode with DP 1.4 supports a maximum resolution of 3440 x 1440 at 60 Hz, PD 20 V/4.5 A, 15 V/3 A, 9 V/3 A, 5 V/3 A. NOTE: USB Type-C is not supported on versions of Windows prior to Windows 10.
12 USB Type-C downstream port Connect your USB device.** NOTE: To use this port, you must connect the USB Type-C cable or USB Upstream Cable (shipped with your monitor) to the USB Type-C upstream port or the USB TypeB upstream port on the monitor and to your computer. *Headphone usage is not supported for the audio line out connector.
Response time 8 ms (Normal) 5 ms (Fast) Color depth 1.07 billion colors Color gamut sRGB 99%, Rec 709 99%, DCI-P3 95% Calibration accuracy sRGB & Rec 709: Delta E < 2 (average) Connectivity • 1 x DisplayPort version 1.4 • 2 x HDMI port version 2.0 • 1 x USB Type-C upstream port (Alternate mode with DisplayPort 1.4, Power Delivery PD up to 90 W)* • 1 x USB Type-C downstream port with charging capability at 15 W (maximum) • 1 x super speed USB 5 Gbps (USB 3.
*DisplayPort and USB Type-C (Alternate mode with DisplayPort 1.4): HBR3/ DisplayPort 1.4/DP audio is supported.
VESA, 1280 x 1024 80.0 75.0 135.0 +/+ VESA, 1600 x 1200 75.0 60.0 162.0 +/+ VESA, 1920 x 1080 67.5 60.0 148.5 +/+ VESA, 2560 x 1440 88.8 60.0 241.5 +/- VESA, 3440 x 1440* 88.8 60.0 319.8 +/- * Requires a graphics card that supports HDMI 2.0. Electrical specifications Model U3421WE Video input signals HDMI 2.0*/DisplayPort 1.
This document is informational only and reflects laboratory performance. Your product may perform differently, depending on the software, components and peripherals you ordered and shall have no obligation to update such information. Accordingly, the customer should not rely upon this information in making decisions about electrical tolerances or otherwise. No warranty as to accuracy or completeness is expressed or implied. NOTE: This monitor is ENERGY STAR certified.
Depth 57.5 mm (2.26 in.) / 60.2 mm (2.37 in.) Stand dimensions Height (extended) 433.3 mm (17.06 in.) Height (compressed) 386.5 mm (15.22 in.) Width 357.5 mm (14.07 in.) Depth 237.4 mm (9.35 in.) Base 357.5 mm x 235 mm (14.07 in. x 9.25 in.) Weight Weight with packaging 16.30 kg (35.93 lb) Weight with stand assembly and cables 11.65 kg (25.68 lb) Weight without stand assembly (For wall mount or VESA mount considerations - no cables) 7.52 kg (16.57 lb) Weight of stand assembly 3.63 kg (8.
Humidity Operating 10% to 80% (non-condensing) Non-operating • Storage: 5% to 90% (non-condensing) • Shipping: 5% to 90% (non-condensing) Altitude Operating 5000 m (16404 ft) (maximum) Non-operating 12192 m (40000 ft) (maximum) Thermal dissipation • 716.5 BTU/hour (maximum) • 122.
15 AUX (p) 16 GND 17 AUX (n) 18 Hot Plug Detect 19 Re-PWR 20 +3.3 V DP_PWR HDMI connector Pin number 19-pin side of the connected signal cable 1 TMDS DATA 2+ 2 TMDS DATA 2 SHIELD 3 TMDS DATA 2- 4 TMDS DATA 1+ 5 TMDS DATA 1 SHIELD 6 TMDS DATA 1- 7 TMDS DATA 0+ 8 TMDS DATA 0 SHIELD 9 TMDS DATA 0- 10 TMDS CLOCK+ 11 TMDS CLOCK SHIELD 12 TMDS CLOCK- 13 CEC 14 Reserved (N.C.
18 +5 V POWER 19 HOT PLUG DETECT Plug and play capability You can install the monitor in any Plug and Play-compatible system. The monitor automatically provides the computer system with its Extended Display Identification Data (EDID) using Display Data Channel (DDC) protocols so that the system can configure itself and optimize the monitor settings. Most monitor installations are automatic; you can select different settings if desired.
USB 3.2 upstream connector Pin number 9-pin side of the connector 1 VCC 2 D- 3 D+ 4 GND 5 SSTX- 6 SSTX+ 7 GND 8 SSRX- 9 SSRX+ USB 3.
8 SSTX- 9 SSTX+ USB Type-C connector Pin Number Signal Name Pin Number Signal Name A1 GND B1 GND A2 TX1+ B2 TX2+ A3 TX1- B3 TX2- A4 VBUS B4 VBUS A5 CC1 B5 CC2 A6 D+ B6 D+ A7 D- B7 D- A8 SBU1 B8 SBU2 A9 VBUS B9 VBUS A10 RX2- B10 RX1- A11 RX2+ B11 RX1+ A12 GND B12 GND USB ports • 1 USB Type-C upstream - bottom • 1 USB Type-C downstream - bottom • 1 super speed USB 5 Gbps (USB 3.2 Gen1) Type-B upstream - bottom • 4 super speed USB 5 Gbps (USB 3.
NOTE: The USB ports on the monitor work only when the monitor is turned On or in Standby mode. If you turn Off the monitor and then turn it On, the attached peripherals may take a few seconds to resume normal functionality.
Support OS OS Windows Version • Win 7 (LAN driver V7.48) • Win 8, 8.1 (LAN driver V8.55) • Win 10 (LAN driver V10.34) Linux OS (Chrome, Android, Other Linux based OS) • The Linux OS base on kernel version support to V4.15 or before (LAN driver V2.12.0) macOS • V10.6 to V10.15 (LAN driver V1.0.20) Network (RJ45) data rate via USB-C at: • High Resolution: 480 Mbps • High Data Speed: 1000 Mbps NOTE: This LAN port is 1000Base-T IEEE 802.
• Use a lightly-dampened, warm cloth to clean the monitor. Avoid using detergent of any kind as some detergents leave a milky film on the monitor. • If you notice white powder when you unpack your monitor, wipe it off with a cloth. • Handle your monitor with care as a darker-colored monitor may get scratched and show white scuff marks more than a lighter-colored monitor.
Setting up the monitor Attaching the stand NOTE: The stand is not installed at the factory when shipped. NOTE: The following instructions are applicable only for attaching the stand that was shipped with your monitor. If you are attaching a stand that you purchased from any other source, follow the set up instructions that were included with the stand. To attach the monitor stand: 1. Follow the instructions on the flaps of carton to remove the stand from the top cushion that secures it. 2.
6. Lift the cover, as shown, to access the VESA area for stand assembly. 7. Attach the stand assembly to the monitor. a. Fit the two tabs on the upper part of the stand to the groove on the back of the monitor. b. Press the stand down till it snaps into place.
8. Place the monitor upright. NOTE: Lift the monitor carefully to prevent it from slipping or falling. 9. Remove the cover from the monitor.
Connecting your monitor WARNING: Before you begin any of the procedures in this section, follow the Safety instructions. NOTE: Dell monitors are designed to work optimally with Dell supplied inbox cables. Dell does not guarantee the video quality and performance when using non-Dell cables. NOTE: Route the cables through the cable-management slot before connecting them. NOTE: Do not connect all cables to the computer at the same time. NOTE: The graphics are used for the purpose of illustration only.
• Toggle the Joystick to highlight DP. • Press and hold the Joystick for approximately 10 seconds, and the DisplayPort configuration message appears. • Toggle the Joystick to select Yes and then press the joystick to save the changes. Repeat the above steps to change the DisplayPort format settings if necessary. Connecting the HDMI cable NOTE: The default out of factory setting is HDMI 2.0.
• Press and hold the Joystick for approximately 10 seconds, and the HDMI configuration message appears. • Toggle the Joystick to select Yes and then press the joystick to save the changes. Repeat the above steps to change the HDMI format settings if necessary. Connecting the USB Type-C cable NOTE: Use the USB Type-C cable shipped with monitor only. • • • This port supports DisplayPort Alternate Mode (DP1.4 standard only). The USB Type-C power delivery compliant port (PD Version 3.
Connecting the super speed USB 5 Gbps (USB 3.2 Gen1) cable NOTE: To prevent data damage or loss, before unplugging the USB upstream port, make sure that NO USB storage devices are in use by the computer connected to the monitor’s USB downstream port. After you have completed connecting the DisplayPort/HDMI/USB Type-C cable, follow the procedures below to connect the USB cable to the computer and complete your monitor setup: 1. a. Connect one computer: connect the USB 3.
* When connecting two computers to the monitor, configure the USB settings from the OSD menu to share a single set of keyboard and mouse connected to the monitor between two computers. See USB and Setting the KVM switch for details. 4. Turn On the monitor and the computer(s). If your monitor displays an image, installation is complete. If it does not display an image, see Common problems. 5. Use the cable slot on the monitor stand to organize the cables.
Removing the monitor stand NOTE: To prevent scratches on the LCD screen when removing the stand, ensure that the monitor is placed on a soft, clean surface. NOTE: The following instructions are applicable only for attaching the stand that was shipped with your monitor. If you are attaching a stand that you purchased from any other source, follow the set up instructions that were included with the stand. To remove the stand: 1. Place the monitor on a soft cloth or cushion. 2.
3. Use a Phillips crosshead screwdriver to remove the four screws securing the plastic cover. 4. Attach the mounting bracket from the wall mounting kit to the monitor. 5. Mount the monitor on the wall. For more information, see the documentation that shipped with the wall mounting kit. NOTE: For use only with UL or CSA or GS-listed wall mount bracket with minimum weight or load bearing capacity of 30.08 kg.
Operating the monitor Power on the monitor Press the Power Button to turn On the monitor. Using the Joystick Control Use the Joystick control on the rear of the monitor to make OSD adjustments. 1. Press the Joystick button to launch the OSD main menu. 2. Move the Joystick up/down/left/right to toggle between options. 3. Press the Joystick button again to confirm the settings and exit.
Joystick Description • When the OSD menu is on, press the button to confirm the selection or save the settings. • When the OSD menu is off, press the button to launch the OSD main menu. See Accessing the menu system. • For 2-way (right and left) directional navigation. • Move right to enter the submenu. • Move left to exit from the submenu. • For 2-way (up and down) directional navigation. • Toggles between the menu items. • Increases (up) or decreases (down) the parameters of selected menu item.
2 Select this icon to adjust the brightness and contrast level. Shortcut key/ Brightness/Contrast 3 Select this icon to set PIP/PBP. Shortcut key/ PIP/PBP 4 Select this icon to switch between the USB upstream sources in PIP/PBP mode. Shortcut key/ USB Switch 5 Select this icon to set the Input Source. Shortcut key/ Input Source Select this icon to launch the On-Screen Display (OSD). See Accessing the menu system. 6 Menu Select this icon to exit the OSD main menu.
Icon Menu and Submenus Description Brightness/ Contrast Use this menu to activate Brightness/Contrast adjustment. Brightness Brightness adjusts the luminance of the backlight. Toggle the Joystick up to increase the brightness and toggle the Joystick down to decrease the brightness (min. 0 / max. 100). Contrast Adjusts the Brightness first, and then adjust the Contrast only if further adjustment is necessary.
Input Source USB-C 90W DP Use the Input Source menu to select between the different video signals that may be connected to your monitor. Select the USB-C 90W input when you are using the USB Type-C connector. Press the Joystick to confirm the selection. Select the DP input when you are using the DisplayPort (DP) connector. Press the Joystick to confirm the selection. HDMI 1 Select the HDMI 1 input when you are using the HDMI 1 connector. Press the Joystick to confirm the selection.
Auto Select for USB-C 90W Allows you to set Auto Select for USB-C to: • Prompt for Multiple Inputs: Always displays the “Switch to USB-C Video Input” message for you to choose whether to switch or not. • Yes: Always switches to USB-C video input (without asking) when the USB Type-C cable is connected. • No: Never automatically switches to USB-C video input when the USB Type-C cable is connected. NOTE: Auto Select for USB-C only when Auto Select is on.
Preset Modes Allows you to choose from a list of preset color modes. • Standard: Loads the monitor's default color settings. This is the default preset mode. • ComfortView: Decreases the level of blue light emitted from the screen to make viewing more comfortable for your eyes. WARNING: The possible long-term effects of blue light emission from the monitor may cause personal injury such as digital eye strain, eye fatigue and damage to the eyes.
Preset Modes 4. Look away from your monitor and gaze at a distant object at 20 feet away for at least 20 seconds during the breaks. 5. Perform stretches to relieve tension in the neck, arm, back, and shoulders during the breaks. • Movie: Loads color settings ideal for movies. • Game: Loads color settings ideal for most gaming applications. • Color Temp.: Allows you to select the color temperature: 5000K, 5700K, 6500K, 7500K, 9300K, and 10000K. Press the Joystick to confirm the selection.
Input Color Format Allows you to set the video input mode to: • RGB: Select this option if your monitor is connected to a computer (or media player) using the USB Type-C, DisplayPort, or HDMI cable. • YPbPr: Select this option if your media player supports only YPbPr output. Press the Joystick to confirm the selection. Hue This feature can shift the color of the video image to green or purple. This is used to adjust the desired flesh tone color.
Display Aspect Ratio Sharpness Use the Display menu to adjust images. Adjusts the image ratio to Wide 21:9, Auto Resize, 4:3, or Pixel-for-Pixel. This feature can make the image look sharper or softer. Toggle the Joystick up or down to adjust the sharpness from '0' to '100'. Response Time Allows you to set the Response Time to Normal or Fast. Uniformity Compensation Select screen uniformity compensation settings. On is factory calibrated setting by default.
USB-C Prioritization Allows you to specify the priority to transfer the data with high resolution (High Resolution) or high speed (High Data Speed) when using the USB Type-C port/DisplayPort. Reset Display Resets all display settings to the factory preset values.
PIP/PBP This function brings up a window displaying image from another input source. Main Window USB-C DP HDMI 1 HDMI 2 USB-C X DP Sub-Window HDMI 1 HDMI 2 X X X NOTE: The images under PBP will be displayed at the center of the screen, not full screen.
PIP/PBP Mode Adjusts the PIP/PBP (Picture in Picture/Picture by Picture) mode to 26%), (50% - 50%), (26% - 74%), (PIP2 small), small), (PIP1 small), (PIP3 small), (PIP1 large), (PIP3 large), or (74% (PIP4 (PIP2 large), (PIP4 large). You can disable this feature by selecting Off. PIP/PBP (Sub) Select between the different video signals that may be connected to your monitor for the PIP/PBP subwindow. USB Switch Select to switch between the USB upstream sources in PIP/PBP mode.
USB Allows you to assign the USB upstream port for the input signals (DP, HDMI 1, and HDMI 2), thus the monitor's USB downstream port (eg. keyboard and mouse) can be used by the current input signals when you connect a computer to either one of the upstream ports. See also Setting the KVM switch for details. When you use only one upstream port, the connected upstream port is active.
Audio Volume Allows you to set the volume level of speakers. Toggle the Joystick up or down to adjust the volume level from '0' to '100'. Speaker Reset Audio Allows you to enable or disable the speaker function. Select this option to restore default audio settings.
Menu Select this option to adjust the settings of the OSD, such as, the languages of the OSD, the amount of time the menu remains on screen, and so on. Language Sets the OSD display to one of the eight languages (English, Spanish, French, German, Brazilian Portuguese, Russian, Simplified Chinese, or Japanese). Transparency Select this option to change the menu transparency by toggling the Joystick up or down (min. 0 / max. 100).
Lock With the control buttons on the monitor locked, you can prevent people from accessing the controls. It also prevents accidental activation in multiple monitors side-by-side setup. • Menu Buttons: All Joystick functions are locked and not accessible by the user. • Power Button: Only the Power Button is locked and not accessible by the user. • Menu + Power Buttons: Both the Joystick & the Power Button are locked and not accessible by the user. The default setting is Disable.
Personalize Shortcut Key 1 Shortcut Key 2 Shortcut Key 3 Shortcut Key 4 Allows you to choose a feature from Preset Modes, Brightness/Contrast, Input Source, Aspect Ratio, PIP/PBP Mode, USB Switch, Video Swap, Volume, or Display Info and set it as a shortcut key. Shortcut Key 5 Power Button LED Allows you to set the power LED indicator on or off to save energy. USB-C Charging 90W Allows you to enable or disable the Always On USB Type-C Charging function during monitor Off mode.
Others Display Info DDC/CI Select this option to adjust the OSD settings, such as DDC/CI, LCD Conditioning, and so on. Displays the monitor's current settings. DDC/CI (Display Data Channel/Command Interface) allows your monitor parameters (brightness, color balance, and etc.) to be adjustable via the software on your computer. You can disable this feature by selecting Off. Enable this feature for best user experience and optimum performance of your monitor.
LCD Conditioning Firmware Service Tag Reset Others Helps reduce minor cases of image retention. Depending on the degree of image retention, the program may take some time to run. You can enable this feature by selecting On. Displays the firmware version of your monitor. Displays the service tag of your monitor. This string is required when you look for phone support, check your warranty status, update drivers on Dell's website, etc. Resets all settings under the Others menu to the factory preset values.
Factory Reset Restore all preset values to the factory default settings. These are also the settings for ENERGY STAR® tests. OSD warning message When the monitor does not support a particular resolution mode, you will see the following message: This means that the monitor cannot synchronize with the signal that it is receiving from the computer. See Monitor specifications for the Horizontal and Vertical frequency ranges addressable by this monitor. Recommended mode is 3440 x 1440.
You will see the following message before the DDC/CI function is disabled: When you adjust the Brightness level for the first time, the following message appears: NOTE: If Yes is selected, the message will not appear next time when you intend to change the Brightness setting.
NOTE: If you select Yes for any one of the features mentioned above, the message will not appear next time when you intend to change the settings of these features. When you perform a factory reset, the message will appear again. You will see the following message before the Lock function is activated: NOTE: The message may be slightly different according to the selected settings.
Activate the computer and the monitor to gain access to the OSD. NOTE: The message may be slightly different according to the connected input signal. If either USB Type-C, DisplayPort, or HDMI input is selected and the corresponding cable is not connected, a floating dialog box as shown below appears. NOTE: The message may be slightly different according to the connected input signal.
When Yes is selected, the following message appears. See Troubleshooting for more information. Setting the maximum resolution To set the maximum resolution for the monitor: In Windows® 7, Windows® 8, and Windows® 8.1: 1. For Windows® 8 and Windows® 8.1 only, select the Desktop tile to switch to classic desktop. 2. Right-click on the desktop and click Screen Resolution. 3. Click the dropdown list of the Screen Resolution and select 3440 x 1440. 4. Click OK. In Windows® 10: 1.
• Go to http://www.dell.com/support, enter your service tag, and download the latest driver for your graphics card. If you are using a non-Dell computer (portable or desktop): • Go to the support site for your computer and download the latest graphic drivers. • Go to your graphics card website and download the latest graphic drivers. Setting the KVM switch The built-in KVM switch allows you to control up to 2 computers from a single set of keyboard and mouse connected to the monitor. a.
b. When connecting HDMI + USB-B to computer 1 and USB-C to computer 2: NOTE: The USB-C connection currently supports video and data transfer. Make sure USB for HDMI is assigned to USB-B .
NOTE: As the USB Type-C port supports the DisplayPort Alternate Mode, there is no need to set USB for USB-C. NOTE: When connecting to different video input sources not shown above, follow the same method to make correct settings for USB to pair the ports. Setting the Auto KVM You can follow below instruction to set up Auto KVM for your monitor: 1. Ensure that PIP/PBP Mode is Off.
2. Ensure that Auto Select is On and Auto Select for USB-C 90W is Yes. 3. Ensure that the USB ports and the video inputs are paired accordingly.
NOTE: For USB Type-C connection, there is no further setting required. Using the tilt, swivel, vertical extension, and slant adjust NOTE: The following instructions are applicable only for attaching the stand that was shipped with your monitor. If you are attaching a stand that you purchased from any other source, follow the set up instructions that were included with the stand.
Tilt, swivel With the stand attached to the monitor, you can tilt and swivel the monitor for the most comfortable viewing angle. NOTE: The stand is not installed at the factory when shipped. Vertical extension NOTE: The stand extends vertically up to 150 mm. The figure below illustrates how to extend the stand vertically.
Slant adjust With the stand attached to the monitor, you can adjust the monitor to your desired angle with the slant adjust feature.
Troubleshooting WARNING: Before you begin any of the procedures in this section, follow the Safety instructions. Self-test Your monitor provides a self-test feature that allows you to check whether your monitor is functioning properly. If your monitor and computer are properly connected but the monitor screen remains dark, run the monitor self-test by performing the following steps: 1. Turn off both your computer and the monitor. 2. Unplug the video cable from the back of the computer. 3.
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. Toggle and hold the Joystick to the up or down or left or right for about 4 seconds until a pop menu appears.
3. Toggle the Joystick to highlight the Diagnostics icon, then press the Joystick, and a gray screen appears. 4. Carefully inspect the screen for abnormalities. 5. Toggle the Joystick up. The color of the screen changes to red. 6. Inspect the display for any abnormalities. 7. Repeat steps 5 and 6 to inspect the display in green, blue, black, white and text screens. The test is complete when the text screen appears. To exit, toggle the Joystick up again.
Always On USB Type-C Charging The monitor allows you to charge your notebook or mobile devices through the USB Type-C cable even when the monitor is powered off. See USB-C Charging 90W for more information. You may verify your current firmware revision in Firmware. If this is not available, go to the Dell download support site for the latest application installer (Monitor Firmware Update Utility.exe) and refer to the Firmware Update Instruction User's Guide: www.dell.com/U3421WE.
Poor Focus Picture is fuzzy, • Eliminate video extension cables. blurry, or ghosting • Reset the monitor to factory settings. • Change the video resolution to the correct aspect ratio. Shaky/Jittery Video Wavy picture or fine movement • Reset the monitor to factory settings. • Check environmental factors. • Relocate the monitor and test in another room. Missing Pixels LCD screen has spots • Cycle power On-Off. • Pixel that is permanently Off is a natural defect that can occur in LCD technology.
Horizontal/ Vertical Lines Screen has one or more lines • Reset the monitor to factory settings. • Perform monitor self-test feature check and determine if these lines are also in self-test mode. • Check for bent or broken pins in the video cable connector. • Run the built-in diagnostics. Synchronization Problems Screen is scrambled or appears torn • Reset the monitor to factory settings. • Perform monitor self-test feature check to determine if the scrambled screen appears in self-test mode.
Wrong Color Picture color not good • Change the settings of the Preset Modes in the Color menu OSD depending on the application. • Adjust the R/G/B values under Custom Color in Color menu OSD. • Change the Input Color Format to PC RGB or YPbPr in the Color menu OSD. • Run the built-in diagnostics.
Product specific problems Common symptoms What you experience Possible solutions Screen image is too Image is centered on • Check the Aspect Ratio setting in small screen, but does not the Display menu OSD. fill entire viewing • Reset the monitor to factory settings. area Cannot adjust the monitor with the buttons on the front panel OSD does not • Turn Off the monitor, unplug the appear on the screen power cord, plug it back, and then turn On the monitor. • Check whether the OSD menu is locked.
No video at HDMI/ When connected to • Unplug the HDMI/DisplayPort/USB DisplayPort/USB some dongle/ Type-C cable from dongle/docking docking device at Type-C port device, then plug the docking the port, there is no Thunderbolt cable to the notebook. video when Plug the HDMI/DisplayPort/USB unplugging/plugging Type-C cable 7 seconds later. the Thunderbolt cable from the notebook No network connection Network dropped or • Check to ensure USB-C intermittent Prioritization is set to High Data Speed.
USB Type-C port does not supply power USB peripherals • Check that the connected device is can not be charged compliant with the USB-C specification. The USB Type-C port supports USB 3.2 Gen1 and an output of 90 W. • Check that you use the USB Type-C cable shipped with your monitor. Super speed USB 5 Gbps (USB 3.2 Gen1) interface is slow Super speed USB 5 Gbps (USB 3.2 Gen1) peripherals working slowly or not working at all • Check that your computer is super speed USB 5 Gbps (USB 3.2 Gen1)capable.
Speakers Specific Problems Specific Symptoms No sound coming from the external speakers What You Experience Cannot hear any sound Possible Solutions • Turn Off the monitor, unplug the monitor power cord, replug it, and then turn On the monitor. • Ensure the audio cable is connected correctly between the Audio Line Out port and the external speaker. • Disconnect/reconnect the audio cable from the Audio Line Out port and the external speaker. • Reset the monitor to factory settings.
Appendix WARNING: Safety instructions WARNING: Use of controls, adjustments, or procedures other than those specified in this documentation may result in exposure to shock, electrical hazards, and/or mechanical hazards. For information on safety instructions, see Safety, Environmental, and Regulatory Information (SERI). FCC notices (U.S. only) and other regulatory information For FCC notices and other regulatory information, see the regulatory compliance website located at www.dell.
