Dell XPS One 24 User manual

Model: U2421E
Regulatory model: U2421Et
Dell UltraSharp 24
USB-C Hub Monitor - U2421E
User’s Guide

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.
2020 – 10
Rev. A00

Contents
Safety instructions..............................5
About your monitor .............................6
Package contents . . . . . . . . . . . . . . . . . . . . . . . . . 6
Product features. . . . . . . . . . . . . . . . . . . . . . . . . .7
Identifying parts and controls. . . . . . . . . . . . . . . . . . .8
Front view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Back view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Bottom view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Monitor specifications. . . . . . . . . . . . . . . . . . . . . . .11
Resolution specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Preset display modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
DP MST Multi-Stream Transport (MST) Modes . . . . . . . . . . . . . . 13
USB-C MST Multi-Stream Transport (MST) Modes . . . . . . . . . . . . 13
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Environmental characteristics . . . . . . . . . . . . . . . . . . . . . . . . 16
Pin assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Plug-and-Play . . . . . . . . . . . . . . . . . . . . . . . . . . 24
LCD monitor quality and pixel policy . . . . . . . . . . . . . . 24
Ergonomics . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Handling and moving your display. . . . . . . . . . . . . . . . 27
Maintenance guidelines . . . . . . . . . . . . . . . . . . . . . 28
Cleaning your monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Setting up the monitor..........................29
Connecting the stand . . . . . . . . . . . . . . . . . . . . . . 29
Using the tilt, swivel, and vertical extension . . . . . . . . . . 32
Contents | 3

4| Contents
Tilt, swivel and vertical extension . . . . . . . . . . . . . . . . . . . . . .32
Rotating the Display . . . . . . . . . . . . . . . . . . . . . . . 32
Configuring the display settings on your computer after rotation33
Connecting your monitor . . . . . . . . . . . . . . . . . . . . 34
Organizing your cables . . . . . . . . . . . . . . . . . . . . . 38
Securing your monitor using Kensington lock (optional) . . . 38
Removing the monitor stand . . . . . . . . . . . . . . . . . . 39
Wall mounting (Optional) . . . . . . . . . . . . . . . . . . . . 40
Operating the monitor ..........................41
Power on the monitor . . . . . . . . . . . . . . . . . . . . . . 41
Using the joystick control . . . . . . . . . . . . . . . . . . . . 41
Using the rear-panel controls . . . . . . . . . . . . . . . . . . 42
Using the OSD lock function . . . . . . . . . . . . . . . . . . 43
Front-panel button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Using the On-Screen Display (OSD) Menu . . . . . . . . . . . 47
Accessing the menu system . . . . . . . . . . . . . . . . . . . . . . . . . 47
OSD warning messages . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Setting the maximum resolution. . . . . . . . . . . . . . . . . . . . . . .61
Troubleshooting ...............................62
Self-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Built-in diagnostics . . . . . . . . . . . . . . . . . . . . . . . 63
Common Problems. . . . . . . . . . . . . . . . . . . . . . . . 64
Product specific problems . . . . . . . . . . . . . . . . . . . 65
Universal Serial Bus (USB) specific problems . . . . . . . . . 68
Appendix.....................................70
FCC notices (U.S. only) and other regulatory information . . . 70
Contacting Dell . . . . . . . . . . . . . . . . . . . . . . . . . 70
EU product database for energy label and product information
sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Safety instructions | 5
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.
• Place the monitor on a solid surface and handle it carefully. The screen is fragile
and can be damaged if dropped or hit sharply.
• Always be sure 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 crystal of the display.
• 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 of
time.
• To avoid electric shock, do not attempt to remove any cover or touch the inside
of the monitor.
For information on safety instructions, see the Safety, Environmental, and Regulatory
Information (SERI).

6| About your monitor
About your monitor
Package contents
Your monitor ships with the components shown in the table below. If any component is
missing, contact Dell. For more information, see Contact Dell.
NOTE: Some components may be optional and may not ship with your
monitor. Somefeatures may not be available in certain countries.
Display
Stand riser
Stand base
Power cable (varies by country)
DisplayPort cable (DisplayPort to
DisplayPort)
USB Type-C cable (C to A)

About your monitor | 7
USB Type-C cable (C to C)
U2421E Color Calibration Factory Report
EveryDell U2421E is shippe d incorporating pre-tune d
standardmo de(sRGB) with avera ge Delta-E ≤2.
Thishelps preve nt significant color inconsistency or
inaccuracywhen c ontent is displayed onscreen.
Inaddition, a tighter grey-sca le tracking on each U2421E
helpsenable ultra-sm ooth color gradation. The factory
measurements from this very unit are show n here.
Beassured of Accurate, P recise and Consiste nt
OnscreenCol orw ith every Dell UltraSharp U 2421E.
SerialNo.
Tester
Test
Equipment
CN00WG2J7444572B046L
2008L0415
CA-210/CA-310
CA-2000S
Chroma2326/2235/2233
Standardmo de (sRGB) Avg.Delta E ≤2
Gray-Scale Tracking
Gamma
Note:
Calibrationswere doneaccording to Dell a pprovedtestpro cedures using calibrated
equipmentat the factoryproduction line. This Report is provided only withand for this new De ll U2421E
UltraSharpmon itor. Resultsmay vary with o ther test equip ment, setups and testpatterns. Please ret ain this Report
foryour refere nce as Dell is unab let ore produce it or provide a du plicate.
Dell UltraSharp U2421E
Dell.com/U2421E
2020-09
• Quick Setup Guide
• Safety, Environmental, and Regulatory
Information
• Factory Calibration Report
Product features
The Dell UltraSharp U2421E monitor has an active matrix, Thin-Film Transistor
(TFT), Liquid Crystal Display (LCD), and LED backlight. The monitor features include:
• 61.13 cm (24.1 in.) active area display (Measured diagonally) 1920 x 1200 (16:10)
resolution, plus full-screen support for lower resolutions.
• Wide viewing angles with 99% sRGB color with an average Delta E<2.
• Tilt, swivel, pivot and vertical extension adjustment capabilities.
• Removable pedestal stand and Video Electronics Standards Association (VESA™)
100 mm mounting holes for flexible mounting solutions.
• Ultra-thin bezel minimizes the bezel gap during multi-monitor usage, enabling
easier set up with an elegant viewing experience.
• Extensive digital connectivity with DP helps future-proof your monitor.
• Single USB Type-C to supply power to compatible notebook while receiving video
signal.
• USB-C 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 and OSD buttons lock.
• Security lock slot.
• ≤ 0.3 W in Standby Mode.
• Premium Panel Exchange for peace of mind.
• Optimize eye comfort with a flicker-free screen minimizes hazard blue light
emission.
• The Monitor use Low Blue Light panel and compliance with TUV Rheinland
(Hardware Solution) at factory reset/default setting model.
• Decreases the level of hazard 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 damage to the eyes, including eye fatigue or digital eye
strain.

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

About your monitor | 9
Back view
7
1
2
3
654
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.
4Power On/Off button To turn the monitor on or off.
5Joystick Use it to control the OSD menu.
For more information, see Operating the
Monitor.
6Mac address, Barcode, serial
number, and Service Tag label
Refer to this label if you need to contact Dell
for technical support. The Service Tag is a
unique alphanumeric identifier that enables
Dell service technicians to identify the
hardware components in your computer and
access warranty information.
7Cable-management slot Use to organize cables by inserting them
through the slot.

10 | About your monitor
Bottom view
99
1 4 5 6 7 8
13
32 11 129 10
Label Description Use
1Security lock slot Secures monitor with security cable lock (sold separately).
2Power connector Connect the power cable.
3HDMI port Connect your computer with the HDMI cable.
4DisplayPort in Connect your computer with the DisplayPort cable.
5USB Type-C/
DisplayPort
Connect to your computer using the USB Type-C cable.
The USB Type-C port offer the fastest transfer rate and
the alternate mode with DP 1.4 support the maximum
resolution of 1920 x 1200 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 Windows versions
that are prior to Windows 10.
6DP port (out) DP output for MST (multi-stream transport) capable
monitor. To enable MST, refer to instruction on section
“Connecting the Monitor for DP MST Function”.
NOTE: Remove the rubber plug when using DP out
connector.
7,9,11 SuperSpeed USB
5 Gbps (USB 3.2
Gen1) (3)
Connect your USB device. You can use these ports only
after you have connected the USB cable (Type-A to
Type-C or Type-C to Type-C) from the computer to the
monitor. Port with battery icon supports Battery
Charging Rev. 1.2.
8Audio line-out
port
Connect speakers to playback audio through HDMI or
DisplayPort audio channels.
Only two-channel audio is supported.
NOTE: The audio line-out port does not support
headphones.

About your monitor | 11
10 RJ-45 connector Connect Internet. You can surf Internet via RJ45 only after
you have connected the USB cable(Type-A to Type-C or
Type-C to Type-C) from the computer to the monitor.
12 USB Type-C
downstream port
Port with icon supports 5 V/ 3 A.
Connect your USB device. You can use these ports only
after you have connected the USB cable (Type-A to
Type-C or Type-C to Type-C) from the computer to the
monitor.
13 Stand lock Lock the stand to the monitor using a M3 x 8 mm screw
(screw not included).
Monitor specifications
Screen type Active matrix - TFT LCD
Panel Type In-plane switching Technology
Aspect ratio 16:10
Viewable image dimensions
Diagonal 61.13 cm (24.1 in.)
Active Area
Horizontal 518.4 mm (20.40 in.)
Vertical 324.0 mm (12.76 in.)
Area 167961.6 mm2(260.30 in.2)
Pixel pitch 0.27 mm x 0.27 mm
Pixel per inch (PPI) 93.95
Viewing angle
Horizontal 178° (typical)
Vertical 178° (typical)
Brightness 350 cd/m² (typical)
Contrast ratio 1000 to 1 (typical)
Display screen coating Anti-glare treatment of the front polarizer (3H) hard
coating
Backlight LED
Response Time (Gray to
Gray)
5 ms (Fast mode)
8 ms (Normal mode)
Color depth 16.78 million colors

12 | About your monitor
Color gamut* 99% sRGB
99% REC709
Calibration accuracy Delta E < 2 (average)
Connectivity • 1 x DP 1.4
• 1 x HDMI1 .4
• 1 x USB Type-C (Alternate mode with DisplayPort 1.4,
USB 3.2 Gen 1 upstream port, Power Delivery PD up
to 90 W)
• 1 x USB Type-C downstream (15 W), USB 3.2 Gen 1 (5
Gbps)
• 1 x DP (Out) with MST
• 2 x SuperSpeed USB 5 Gbps (USB 3.2 Gen 1)
• 1 x SuperSpeed USB 5 Gbps (USB 3.2 Gen 1) with BC
1.2 charging capability at 2 A (max)
• 1 x Analog 2.0 audio line out (3.5 mm jack)
• 1 x RJ45
Border width (edge of monitor to active area)
To p
Left/Right
Bottom
6.2 mm
6.2 mm
9.1 mm
Adjustability
Height adjustable stand 150 mm
Tilt -5° to 21°
Swivel -45° to 45°
Pivot -90° to 90°
Cable management Yes
Dell Display Manager (DDM)
Compatibility
Easy Arrange
and other key features
Security Security lock slot (cable lock sold separately)
* At panel native only, under Custom Mode preset.
Resolution specifications
Horizontal scan range 30 kHz to 83 kHz
Vertical scan range 49 Hz to 76 Hz

About your monitor | 13
Maximum preset resolution 1920 x 1200 at 60 Hz
Video display capabilities (HDMI & DP & USB
Type-C alternate mode)
480i, 480p, 576i, 560p, 720p, 1080i,
1080p
Preset display modes
Display mode Horizontal
frequency
(kHz)
Vertical
frequency
(Hz)
Pixel
clock
(MHz)
Sync polarity
(Horizontal/
Vertical)
VGA 720 x 400
31.47
70
28.322
-/+
VGA 640 x 480 31.47 60 25.175 -/-
VESA 640 x 480
37.5
75
31.5
-/-
VESA 800 x 600
37.88
60
40
+/+
VESA 800 x 600
46.88
75
49.5
+/+
VESA 1024 x 768
48.36
60
65
-/-
VESA 1024 x 768
60.02
75
78.75
+/+
MAC 1152 x 864
67.5
75
108
+/+
VESA 1280 x 1024
64
60
108
+/+
VESA 1280 x 1024
80
75
135
+/+
CVT 1600 x 900
55.99
60
118.25
+/+
CVT 1920 x 1080
67.5
60
148.5
+/+
CVT 1920 x 1200 74.04 60 154 +/+
DP MST Multi-Stream Transport (MST) Modes
MST Source Monitor Maximum number of external monitors that can be
supported
1920 x 1200/60 Hz
1920 x 1200/60 Hz 2
NOTE: Maximum external monitor resolution supported is 1920 x 1200 60 Hz only.
USB-C MST Multi-Stream Transport (MST) Modes
OSD Dislay Info: Link rate(current) Maximum number of external monitors that can be
supported
1920 x 1200/60 Hz

14 | About your monitor
HBR3 2
HBR2 1
Electrical specifications
Video input signals • Digital video signal for each dierential line
Per dierential line at 100 ohm impedance
• DP/HDMI/USB Type-C signal input support
Input voltage/ frequency/current 100-240 VAC / 50 or 60 Hz ± 3 Hz / 2.1 A
(maximum)
Inrush current 120 V: 42 A (Max.)
240 V: 80 A (Max.)
Inrush current is measured at an ambient
temperature of 0°C.
Power Consumption 0.2 W (Off Mode)1
0.2 W (Standby Mode)1
17.2 W (On Mode)1
186 W (Max)2
16.16 W (Pon)3
52.39 kWh (TEC)3
1 As dened in EU 2019/2021 and EU 2019/2013.
2Max brightness and contrast setting with maximum power loading on all USB ports.
3 Pon: Power consumption of On Mode as dened in Energy Star 8.0 version.
TEC: Total energy consumption in kWh as dened in Energy star 8.0 version.
This document is informational only and reects laboratory performance. Your prod-
uct may perform dierently, 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 certied.
This product qualies 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 specied limit.

About your monitor | 15
Physical characteristics
Connector type • DP connector (include DP in and DP out)
• HDMI connector
• USB Type-C connector
• Audio line-out
• RJ45 connector
• USB Type-C downstream connector x 1
(Port with icon supports 5 V/3 A)
• USB 3.2 Gen 1 downstream port connector x 3
(Port with battery icon supports BC 1.2.)
Signal cable type DP to DP 1.8 M cable
USB Type-C (C to C) 1.0 M cable
USB Type-C (C to A) 1.8 M cable
Dimensions (with stand)
Height (extended) 510.7 mm (20.11 in.)
Height (compressed) 364.0 mm (14.33 in.)
Width 530.8 mm (20.90 in.)
Depth 173.0 mm (6.81 in.)
Dimensions (without stand)
Height 339.3 mm (13.36 in.)
Width 530.8 mm (20.90 in.)
Depth 50.0 mm (1.97 in.)
Stand dimensions
Height (extended) 410.8 mm (16.17 in.)
Height (compressed) 364.0 mm (14.33 in.)
Width 244.9 mm (9.64 in.)
Depth 173.0 mm (6.81 in.)
Weight
Weight with packaging 8.6 kg (19.0 lb)
Weight with stand assembly and
cables
6.1 kg (13.4 lb)

16 | About your monitor
Weight without stand assembly
(For wall mount or VESA mount
considerations - no cables)
4.0 kg (8.8 lb)
Weight of stand assembly 1.7 kg (3.7 lb)
Environmental characteristics
Compliant Standards
• ENERGY STAR certified Monitor.
• EPEAT registered where applicable. EPEAT registration varies by country.
See www.epeat.net for registration status by country.
• TCO Certified Display.
• RoHS Compliant.
• BFR/PVC Free monitor (excluding external cables).
• Meets NFPA 99 leakage current requirements.
• Arsenic-Free glass and Mercury-Free for the panel only.
Temperature
Operating 0°C to 40°C (32°F to 104°F)
Non-operating –20°C to 60°C (–4°F to 140°F)
Humidity
Operating 10% to 80% (non-condensing)
Non-operating 5% to 90% (non-condensing)
Altitude
Operating 5,000 m (16,404 ft) (maximum)
Non-operating 12,192 m (40,000 ft) (maximum)
Thermal dissipation 635.0 BTU/hour (Maximum)
58.72 BTU/hour (On mode)

About your monitor | 17
Pin assignments
DP port (in)
Pin number 20-pin side of theconnected signal cable
1ML3(n)
2 GND
3ML3(p)
4 ML2(n)
5 GND
6 ML2(p)
7 ML1(n)
8 GND
9 ML1(p)
10 ML0(n)
11 GND
12 ML0(p)
13 CONFIG1
14 CONFIG2
15 AUX CH (p)
16 GND
17 AUX CH (n)
18 Hot Plug Detect
19 Return
20 DP_PWR

18 | About your monitor
DP port (out)
Pin number 20-pin side of theconnected signal cable
1 ML0(p)
2 GND
3 ML0(n)
4 ML1(p)
5 GND
6 ML1(n)
7 ML2(p)
8 GND
9 ML2(n)
10 ML3(p)
11 GND
12 ML3(n)
13 CONFIG1
14 CONFIG2
15 AUX CH(p)
16 GND
17 AUX CH(n)
18 Hot Plug Detect
19 Return
20 DP_PWR

About your monitor | 19
HDMI port
Pin number 19-pin side of theconnected signal cable
1 TMDS DATA 2+
2 TMDS DATA 2 SHIELD
3 TMDS DATA 2-
4TMDS DATA 1+
5TMDS DATA 1 SHIELD
6TMDS DATA 1-
7TMDS DATA 0+
8TMDS DATA 0 SHIELD
9TMDS DATA 0-
10 TMDS CLOCK+
11 TMDS CLOCK SHIELD
12 TMDS CLOCK-
13 CEC
14 Reserved (N.C. on device)
15 DDC CLOCK (SCL)
16 DDC DATA (SDA)
17 DDC/CEC Ground
18 +5 V POWER
19 HOT PLUG DETECT

20 | About your monitor
USB Type-C port
Pin Signal Pin Signal
A1 GND B12 GND
A2 SSTXp1 B11 SSRXp1
A3 SSTXn1 B10 SSRXn1
A4 VBUS B9 VBUS
A5 CC1 B8 SBU2
A6 Dp1 B7 Dn1
A7 Dn1 B6 Dp1
A8 SBU1 B5 CC2
A9 VBUS B4 VBUS
A10 SSRXn2 B3 SSTXn2
A11 SSRXp2 B2 SSTXp2
A12 GND B1 GND