Dell UltraSharp 34 User manual

Dell UltraSharp 34 Curved USB-C Hub
Monitor - U3423WE
User’s Guide
Model: U3423WE
Regulatory model: U3423WEb

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 © 2022 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.
2022 - 09
Rev. A00

│  3
Contents
Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . 6
About your monitor . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Package contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Product features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Identifying parts and controls . . . . . . . . . . . . . . . . . . . . . . 11
Front view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Back view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Bottom view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Monitor specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Resolution specifications. . . . . . . . . . . . . . . . . . . . . . . . . .17
Supported video modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Preset display modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Environmental characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Pin assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Universal Serial Bus (USB) interface . . . . . . . . . . . . . . . . 24
USB 3.2 downstream connector . . . . . . . . . . . . . . . . . . . . . . . . . . 24
USB Type-C connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
USB ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
RJ45 Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Plug and play capability . . . . . . . . . . . . . . . . . . . . . . . . . . 29
LCD monitor quality and pixel policy . . . . . . . . . . . . . . . . 29
Ergonomics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Handling and moving your display . . . . . . . . . . . . . . . . . . .31
Maintenance guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4  │ 
Cleaning your monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Setting up the monitor . . . . . . . . . . . . . . . . . . . . . . 34
Attaching the stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Organizing your cables. . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Connecting your monitor . . . . . . . . . . . . . . . . . . . . . . . . . 37
Connecting the DisplayPort (DisplayPort to DisplayPort) cable. . 38
Connecting the HDMI cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Connecting the USB Type-C cable . . . . . . . . . . . . . . . . . . . . . . . . 38
Connecting the monitor for RJ45 Cable (Optional) . . . . . . . . . . . 39
Connecting the super speed USB 10 Gbps (USB 3.2 Gen2) 
cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Dell Power Button Sync (DPBS) . . . . . . . . . . . . . . . . . . . 41
Connecting the Monitor for DPBS for the First Time . . . . . . . . . . 44
Using DPBS Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Connecting the monitor for USB-C . . . . . . . . . . . . . . . . . . . . . . . . 47
Securing your monitor using Kensington lock 
(optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Removing the monitor stand . . . . . . . . . . . . . . . . . . . . . . 49
VESA wall mounting (optional) . . . . . . . . . . . . . . . . . . . . 50
Operating the monitor . . . . . . . . . . . . . . . . . . . . . . . 51
Power on the monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Using the Joystick Control. . . . . . . . . . . . . . . . . . . . . . . . 51
Using the navigation keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Using the On-Screen Display (OSD) menu . . . . . . . . . . . 54
Accessing the menu system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
OSD warning message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

│  5
Setting the maximum resolution . . . . . . . . . . . . . . . . . . . 76
Setting the KVM switch . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Setting the Auto KVM . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Using the tilt, swivel, vertical extension,
and slant adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Tilt, swivel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Vertical extension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Slant adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Self-test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Using the joystick to lock/unlock buttons . . . . . . . . . . . . 84
Locking the power and joystick buttons . . . . . . . . . . . . . . . . . . . . 84
Always On USB Type-C Charging. . . . . . . . . . . . . . . . . . . 85
Common problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Product specific problems . . . . . . . . . . . . . . . . . . . . . . . . 89
Universal Serial Bus (USB) specific problems . . . . . . . . . 90
Speakers Specific Problems . . . . . . . . . . . . . . . . . . . . . . 92
Regulatory information. . . . . . . . . . . . . . . . . . . . . . 93
FCC notices (U.S. only) and other regulatory 
information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
EU product database for energy label and product
information sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Contact Dell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

6 | Safety instructions
Safety instructions
Use the following safety guidelines to protect your monitor from potential damage
and to ensure your personal safety. Unless otherwise noted, each procedure
included in this document assumes that you have read the safety information that
shipped with your monitor.
NOTE: Before using the monitor, read the safety instruction that is
shipped with your monitor and printed on the product. Keep the
documentation at a secure location for future reference.
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.
WARNING: The possible long-term effect of listening to audio at high
volume through the headphones (on monitor that support it) may cause
damage to your hearing ability.
• Place the monitor on a solid surface and handle it carefully. The screen is
fragile and can be damaged if dropped or hit with a sharp object.
• Ensure that your monitor is electrically rated to operate with the AC power
available in your location.
• Keep the monitor in room temperature. Excessive cold or hot conditions can
have an adverse effect on the liquid crystals of the display.
• Connect the power cable from the monitor to a wall outlet that is near and
accessible. See Connecting your monitor.
• Do not place and use the monitor on a wet surface or near water.
• Do not subject the monitor to severe vibration or high impact conditions. For
example, do not place the monitor inside a car trunk.
• Unplug the monitor when it is going to be left unused for an extended period.
• To avoid electric shock, do not attempt to remove any cover or touch the
inside of the monitor.
• Read these instructions carefully. Keep this document for future reference.
Follow all warnings and instructions marked on the product.
• Certain monitors can be wall mounted using the VESA mount that is sold
separately. Ensure to use the correct VESA specifications as mentioned in the
wall mounting section of the User’s Guide.
For information on safety instructions, see the Safety, Environmental, and
Regulatory Information (SERI) document that is shipped with your monitor.

About your monitor  │  7
About your monitor
Package contents
The following table provides the list of components that are shipped with your
monitor. If any component is missing, contact Dell. 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.
Display
Stand riser
Stand base

8  │  About your monitor
Power cable (varies by
country)
DisplayPort cable (DP to DP)
Cable length: 1.80 M
HDMI cable
Cable length: 1.80 M
USB Type-C cable
Cable length: 1.00 M
USB-A to USB-C Gen2
Cable
Cable length: 1.00 M
•QuickSetupGuide
• Safety, Environmental,
and Regulatory
Information
• Factory calibration report

About your monitor  │  9
Product features
The Dell U3423WE 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 DCI-P3 98%, Display P3 98%, sRGB 100%, and Rec 709 100%
with an average Delta E <2.
• Digital connectivity with DisplayPort, USB Type-C and HDMI.
• Single USB Type-C to supply power (PD 90 W) to a compatible notebook
while receiving video & data signal.
• Tilt, swivel, height, and slant adjust capabilities.
• Ultra-thin bezel minimizes the bezel gap in multi-monitor usage, enabling
easier setup with an elegant viewing experience.
• Removable stand and Video Electronics Standards Association (VESA™)
100 mm mounting holes for flexible mounting solutions.
• Equipped with:
•1 USB Type-C upstream port (video and data; DP1.4 with Alternate mode, PD
up to 90 W)
•1 USB Type-C upstream port (data only)
•1 super speed USB 10 Gbps (USB 3.2 Gen2) Type-C downstream port
•1 super speed USB 10 Gbps (USB 3.2 Gen2) Type-A downstream charging
port
•4 super speed USB 10 Gbps (USB 3.2 Gen2) Type-A downstream ports
• USB-C and RJ45 ports enable a single-cable, network-connected experience.
• Plug and play capability if supported by your system.
• On-Screen Display (OSD) adjustments for ease of set-up and screen
optimization.
• Supports Picture by Picture (PBP) and Picture in Picture (PIP) Select mode.
• 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.
• Supports Auto KVM for multiple input setup.
• Power and OSD buttons lock.
• Security-lock slot.
• Stand lock.
• < 0.3 W in Standby Mode.

10  │  About your monitor
• Built-in speakers (5 W) x 2.
• Optimize eye comfort with a flicker-free screen and ComfortView Plus feature.
• This monitor uses low blue light panel. When the monitor is reset to factory
settings or default setting (Preset mode: Standard), it works in compliance
with TÜV Rheinland (hardware solutions provider).
WARNING: The possible long-term effects of blue light emission from
the monitor may cause damage to the eyes, which includes but is not
limited to eye fatigue and digital eye strain. ComfortView Plus feature is
designed to reduce the amount of blue light emitted from the monitor
to optimize eye comfort.

About your monitor  │  11
Identifying parts and controls
Front view
Label Description Use
1Power LED indicator Solid white light indicates that the
monitor is turned on and functioning
normally. Blinking white light
indicates that the monitor is in
Standby Mode.

12  │  About your monitor
Back view
Back view with monitor stand
Label Description Use
1VESA mounting holes (100 mm
x 100 mm - behind attached
VESA Cover)
Wall mount monitor using VESA-
compatible wall mount kit (100 mm x
100 mm).
2Regulatory label Lists the regulatory approvals.
3Stand release button Releases stand from the monitor.
4Barcode, serial number, and
Service Tag label
Refer to this label if you need to
contact Dell for technical support.
5Power On/Off button To turn the monitor on or off.
6Joystick Use to control the OSD menu. (For
more Information, see Operating the
monitor)
7Cable-management slot Use to organize cables by inserting
them through the slot.

About your monitor  │  13
Bottom view
Bottom view without monitor stand
Label Description Use
1Security lock slot
(based on Kensington
Security Slot™)
Secures the monitor with security lock
(security lock not included).
2Power connector Connect the power cable (shipped with your
monitor).
3HDMI port (2) Connect your computer with the HDMI
cable.
4Stand lock feature To lock the stand to the monitor using a M3 x
6 mm screw (screw not included).
5DisplayPort Connect your computer with the DisplayPort
cable.

14  │  About your monitor
6Super speed USB 10
Gbps (USB 3.2 Gen2)
Type-C upstream port
(video and data)
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 10 Gbps (USB 3.2
Gen2) 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.
7Audio line-out port Connect your external speakers.*
8Super speed USB 10
Gbps (USB 3.2 Gen2)
Type-C upstream port
(data only)
Connect the USB-A to USB-C cable that
came with your monitor to the computer. This
port supports USB data transfer at 10 Gbps
(USB 3.2 Gen2). Once this cable is
connected, you can use the USB connectors
on the monitor.
NOTE: USB Type-C is not supported on
versions of Windows prior to Windows 10.
9Super speed USB 10
Gbps (USB 3.2 Gen2)
Type-A downstream
port (4)
Connect your USB device.**
NOTE: To use this port, you must connect
the USB Type-C cable or USB Type-C to
Type-A Cable (shipped with your monitor) to
the USB Type-C upstream port on the
monitor and to your computer.
10 RJ45 port Support Ethernet connection 10/100/1000
Mbps.
11 Super speed USB 10
Gbps (USB 3.2 Gen2)
Type-A downstream
port with Power
Charging
Connect your USB device** or charge your
device
NOTE: To use this port, you must connect
the USB Type-C cable or USB Type-C to
Type-A Cable (shipped with your monitor) to
the USB Type-C upstream port on the
monitor and to your computer.

About your monitor  │  15
*Headphone usage is not supported for the audio line out connector.
**To avoid signal interference, when a wireless USB device has been connected to
a USB downstream port, it is NOT recommended to connect any other USB
devices to the adjacent port(s).
Monitor specifications
12 Super speed USB 10
Gbps (USB 3.2 Gen2)
Type-C downstream
port
Connect your USB device.**
NOTE: To use this port, you must connect
the USB Type-C cable or USB Type-C to
Type-A Cable (shipped with your monitor) to
the USB Type-C upstream port on the
monitor and to your computer.
13 Speakers Provides audio output.
Model U3423WE
Screen type Active matrix - TFT LCD
Panel technology In-Plane Switching Technology
Aspect ratio 21:9
Viewable image
Diagonal
Width (active area)
Height (active area)
Tot a l a re a
867.16 mm (34.14 in.)
800.05 mm (31.50 in.)
335.05 mm (13.19 in.)
268056.75 mm2(415.49 in.2)
Pixel pitch 0.2325 mm x 0.2325 mm
Pixel per inch (PPI) 109
Viewing angle 178° (vertical) typical
178° (horizontal) typical
Luminance output 300 cd/m² (typical)
Contrast ratio 2000 to 1 (typical)
Faceplate coating Anti-Glare with 3H hardness
Backlight White LED edgelight system

16  │  About your monitor
Response time 8 ms (Normal)
5 ms (Fast)
Color depth 1.07 billion colors
Color gamut •DCI-P398%
•DisplayP398%
• sRGB 100%
• Rec 709 100%
Calibration accuracy DCI-P3, Display P3, sRGB, & Rec 709: 
Delta E <2 (average)
Connectivity • 1 x DisplayPort version 1.4 (HDCP2.2)
• 2 x HDMI port version 2.1 (TMDS) (HDCP2.2)
• 1 x USB Type-C upstream port (video and data)
(Alternate mode with DisplayPort 1.4, Power Delivery
PD up to 90 W)*
• 1 x USB-C upstream port (data only, 10 Gbps USB
3.2 Gen2)
• 4 x super speed USB 10 Gbps (USB 3.2 Gen2) Type-
A downstream port
• 1 x super speed USB 10 Gbps (USB 3.2 Gen2) Type-
C downstream port with charging capability at 15 W
(maximum)
• 1 x super speed USB 10 Gbps (USB 3.2 Gen2) Type-A
with BC1.2 charging capability at 2 A (maximum)
• 1 x Audio line-out port
• 1 x RJ45 port
Border width (edge of
monitor to active area)
10.35 mm (Top)
9.66 mm (Left/Right)
13.90 mm (Bottom)

About your monitor  │  17
*DisplayPort and USB Type-C (Alternate mode with DisplayPort 1.4): HBR3/
DisplayPort 1.4/DP audio is supported.
Resolution specifications
Horizontal scan range 30 kHz to 90 kHz (automatic)
Vertical scan range 56 Hz to 76 Hz (automatic)
Maximum preset resolution 3440 x 1440 at 60 Hz
Supported video modes
Video display capabilities (HDMI
& DisplayPort & USB Type-C
alternate mode)
480p, 576p, 720p, 1080i*, 1080p
*For HDMI input only.
Adjustability
Height adjustable stand
Til t
Swivel
Slant adjust
150 mm
-5° to 21°
-30° to 30°
-4° to 4°
NOTE: Do not mount or use this monitor in portrait (vertical) orientation or
inverse (180°) landscape mount as it may damage the monitor.
Built-in speakers 2 x 5 W sound output
Dell Display Manager
compatibility
Easy Arrange and other key features
Security Security lock slot (cable lock sold separately)
Model U3423WE
Model U3423WE

18  │  About your monitor
Preset display modes
Display mode Horizontal
frequency
(kHz)
Vertical
frequency
(Hz)
Pixel
clock
(MHz)
Sync
polarity
(Horizontal
/Vertical)
VESA, 720 x 400 31.5 70.1 28.3 -/+
VESA, 640 x 480 31.5 59.9 25.2 -/-
VESA, 640 x 480 37.5 75.0 31.5 -/-
VESA, 800 x 600 37.9 60.3 40.0 +/+
VESA, 800 x 600 46.9 75.0 49.5 +/+
VESA, 1024 x 768 48.4 60.0 65.0 -/-
VESA, 1024 x 768 60.0 75.0 78.8 +/+
VESA, 1152 x 864 67.5 75.0 108.0 +/+
VESA, 1280 x 800 - R 49.3 59.9 71.0 +/-
VESA, 1280 x 1024 64.0 60.0 108.0 +/+
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 2.1 (TMDS).
Electrical specifications
Model U3423WE
Video input signals HDMI 2.1 (TMDS)*/DisplayPort 1.4**, 600 mV for each
differential line, 100 ohm input impedance per
differential pair
AC input voltage/
frequency/current
100 VAC to 240 VAC / 50 Hz or 60 Hz ± 3 Hz / 3.0 A
(typical)

About your monitor  │  19
*Not supporting the HDMI 2.1 optional specification, including HDMI Ethernet
Channel (HEC), Audio Return Channel (ARC), standard for 3D format and
resolutions, standard for 4K digital cinema resolution, HDR, Fixed Rate Link (FRL),
Enhanced Audio Return Channel (eARC), Variable Refresh Rate (VRR), Quick
Media Switching (QMS), Quick Frame Transport (QFT), Auto Low Latency Mode
(ALLM), Display Stream Compression (DSC), and Source-Based Tone Mapping
(SBTM).
**HBR3/DisplayPort 1.4/DP audio is supported.
1As defined in EU 2019/2021 and EU 2019/2013.
2Max brightness and contrast setting with maximum power loading on all USB
ports.
3Pon: Power consumption of On mode as defined in Energy Star 8.0 version.
TEC: Total energy consumption in kWh as defined in Energy Star 8.0 version.
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.
Inrush current • 120 V: 40 A (Max.) at 0°C (cold start)
• 240 V: 80 A (Max.) at 0°C (cold start)
Power consumption •0.3W(Offmode)
1
•0.3W(Standbymode)
1
•31W(Onmode)
1
•198W(Max.)
2
•26.24W(Pon)
3
•85.06kWh(TEC)
3
NOTE: This monitor is ENERGY STAR certified. 
This product qualifies for ENERGY STAR in the factory
default settings which can be restored by “Factory Reset”
function in the OSD menu. Changing the factory default
settings or enabling other features may increase power
consumption that could exceed the ENERGY STAR specified
limit.

20│  About your monitor
Physical characteristics
Model U3423WE
Signal cable type • Digital: DisplayPort, 20 pins
• Digital: HDMI, 19 pins
• Universal Series Bus: Type-C, 24 pins
• Universal Serial Bus: USB-C to USB-A
NOTE: Dell monitors are designed to work optimally with the video cables that
are shipped with your monitor. As Dell does not have control over the different
cable suppliers in the market, the type of material, connector and process used to
manufacture these cables, Dell does not guarantee video performance on cables
that are not shipped with your Dell monitor.
Dimensions (with stand)
Height (extended) 542.77 mm (21.37 in.)
Height (compressed) 392.77 mm (15.46 in.)
Width 813.26 mm (32.02 in.)
Depth 237.44 mm (9.35 in.)
Dimensions (without stand)
Height 359.05 mm (14.14 in.)
Width 813.26 mm (32.02 in.)
Depth 57.50 mm (2.26 in.) / 60.15 mm (2.37 in.)
Stand dimensions
Height (extended) 433.30 mm (17.06 in.)
Height (compressed) 386.50 mm (15.22 in.)
Width 357.50 mm (14.07 in.)
Depth 237.44 mm (9.35 in.)
Base 357.50 mm (14.07 in.) x 235.00 mm (9.25 in.)
Weight
Weight with packaging 15.65 kg (34.49 lb)
Weight with stand assembly and
cables
11.44 kg (25.21 lb)