Dell P3421W User manual

Dell P3421W Monitor
User’s Guide
Model: P3421W
Regulatory model: P3421Wb

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

│  3
Contents
About your monitor . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Package contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Product features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Identifying parts and controls . . . . . . . . . . . . . . . . . . . . . . 9
Front view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Back view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Bottom view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Monitor specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Resolution specifications. . . . . . . . . . . . . . . . . . . . . . . . . 14
Supported video modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Preset display modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Environmental characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Pin assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Plug and play capability . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Universal Serial Bus (USB) interface . . . . . . . . . . . . . . . . 21
SuperSpeed USB 5 Gbps (USB 3.2 Gen1). . . . . . . . . . . . . . . . . . . . 21
USB 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
USB Type-C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
USB 3.2 Gen1 (5 Gbps) upstream connector . . . . . . . . . . . . . . . . 22
USB 3.2 Gen1 (5 Gbps) downstream connector . . . . . . . . . . . . . . 22
USB 2.0 downstream connector . . . . . . . . . . . . . . . . . . . . . . . . . . 23
USB Type-C connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
USB ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
LCD monitor quality and pixel policy . . . . . . . . . . . . . . . . 24
Maintenance guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4  │ 
Cleaning your monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Setting up the monitor . . . . . . . . . . . . . . . . . . . . . . 25
Attaching the stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Connecting your monitor . . . . . . . . . . . . . . . . . . . . . . . . . 28
Connecting the DisplayPort (DisplayPort to DisplayPort) cable. . 29
Connecting the HDMI cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Connecting the USB Type-C cable . . . . . . . . . . . . . . . . . . . . . . . . 31
Connecting the USB 3.2 Gen1 (5 Gbps) cable . . . . . . . . . . . . . . . . 31
Organizing your cables. . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Removing the monitor stand . . . . . . . . . . . . . . . . . . . . . . 33
VESA wall mounting (optional) . . . . . . . . . . . . . . . . . . . . 34
Operating the monitor . . . . . . . . . . . . . . . . . . . . . . 35
Power on the monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Using the joystick control . . . . . . . . . . . . . . . . . . . . . . . . 35
Using the On-Screen Display (OSD) menu . . . . . . . . . . . 36
Accessing the Menu Launcher. . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Using the navigation keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Accessing the menu system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
OSD warning message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Setting the maximum resolution . . . . . . . . . . . . . . . . . . . 59
Setting the KVM switch . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Setting the Auto KVM . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Using the tilt, swivel, and vertical extension . . . . . . . . . . 64
Tilt, swivel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Vertical extension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Slant adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Self-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

│  5
Built-in diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Common problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Product specific problems . . . . . . . . . . . . . . . . . . . . . . . . 72
Universal Serial Bus (USB) specific problems . . . . . . . . . 73
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
FCC notices (U.S. only) and other regulatory
information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Contact Dell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
EU product database for energy label and product
information sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

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 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.
Display
Stand riser
Stand base

About your monitor  │  7
Power cable (varies by
country)
DisplayPort cable
(DisplayPort to DisplayPort)
HDMI cable
USB Type-C cable (USB 3.2
Gen1 (5 Gbps))
USB 3.2 Gen1 (5 Gbps)
upstream cable (enables the
USB ports on the monitor)
Cable tie
• Quick Setup Guide
• Safety, Environmental,
and Regulatory
Information

8  │  About your monitor
Product features
The Dell P3421W 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 99% sRGB.
• Digital connectivity with DisplayPort, USB Type-C and HDMI.
• Single USB Type-C to supply power (PD 65 W) to a compatible notebook
while receiving video & data signal.
• Tilt, swivel, height, and slant adjustment 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, 1 USB Type B upstream port, and
4 USB Type-A downstream ports.
• Plug and play capability if supported by your system.
• 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.
• 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.
• Power and joystick buttons lock.
• Security lock slot.
• Stand lock.
• < 0.3 W in Standby Mode.
• 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.

About your monitor  │  9
Identifying parts and controls
Front view
Label Description
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.

10  │  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 T
ag 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  │  11
Bottom view
Bottom view without monitor stand
Label Description Use
1Security lock slot Secures the monitor with security lock
(security lock not included).
2Power connector Connect the power cable (shipped with your
monitor).
3HDMI port Connect your computer with the HDMI cable
(shipped with your monitor).
4DisplayPort Connect your computer with the DisplayPort
cable (shipped with your monitor).
5Stand lock feature To lock the stand to the monitor using a M3 x
6 mm screw (screw not included).
6USB Type-C 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 USB 3.2 Gen1 (5 Gbps) Type-C port
offers the fastest transfer rate and the
alternate mode with DP 1.2 supports a
maximum resolution of 3440 x 1440 at 60 Hz,
PD 20 V/3.25 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  │  About your monitor
1 Pending USB-IF compliance certification.
2 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
7SuperSpeed USB1
5Gbps (USB 3.2 Gen1)
upstream port1
Connect the USB cable that came with your
monitor to the computer. Once this cable is
connected, you can use the USB connectors
on the monitor.
8USB 2.0 downstream
port (2)
Connect your USB 2.0 device.*
NOTE: To use these ports, you must connect
the USB cable (shipped with your monitor) to
the USB-upstream port on the monitor and
to your computer.
9SuperSpeed USB
5Gbps (USB 3.2 Gen1)
downstream port (2)
Connect your USB 3.2 Gen1 (5 Gbps)
device.2
NOTE: To use these ports, you must connect
the USB cable (shipped with your monitor) to
the USB-upstream port on the monitor and
to your computer.
Model P3421W
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)
To t a l a r e a
867.2 mm (34.14 in.)
799.8 mm (31.49 in.)
334.8 mm (13.18 in.)
267773.04 mm2(415.05 in.2)
Pixel pitch 0.2325 mm x 0.2325 mm
Pixel per inch (PPI) 109

About your monitor  │  13
Viewing angle 178° (vertical) typical
178° (horizontal) typical
Luminance output 300 cd/m² (typical)
Contrast ratio 1000 to 1 (typical)
Faceplate coating Anti-Glare with 3H hardness
Backlight White LED edgelight system
Response time 8 ms (Normal)
5 ms (Fast)
Curvature 3800R (typical)
Color depth 1.07 billion colors
NOTE: Video output from the USB-C port at maximum resolution 3440 x 1440 at
60 Hz is limited to 16.7 Million colors.
Color gamut sRGB 99%
Connectivity • 1 x DisplayPort version 1.2 (HDCP 2.3)
• 1 x HDMI port version 2.0 (HDCP 2.3)
• 1 x USB Type-C upstream port (Alternate mode with
DisplayPort 1.2, Power Delivery PD up to 65 W)*
• 1 x SuperSpeed USB 5 Gbps (USB 3.2 Gen1)
upstream port
• 2 x SuperSpeed USB 5 Gbps (USB 3.2 Gen1)
downstream port
• 2 x USB 2.0 downstream port
Border width (edge of
monitor to active area)
8.7 mm (Top)
8.7 mm (Left/Right)
21.9 mm (Bottom)
Adjustability
Height adjustable stand
Ti l 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.

14  │  About your monitor
*DisplayPort and USB Type-C (Alternate mode with DisplayPort 1.2): HBR2 is
supported.
Resolution specifications
Model P3421W
Horizontal scan range 30 kHz to 85 kHz (automatic)
Vertical scan range 48 Hz to 85 Hz (automatic)
Maximum preset resolution 3440 x 1440 at 60 Hz
Supported video modes
Model P3421W
Video display capabilities (HDMI
& DisplayPort & USB Type-C
alternate mode)
480p, 480i, 576p, 576i, 720p, 1080i, 1080p
Preset display modes
Dell Display Manager
compatibility
Easy Arrange and other key features
Security Security lock slot (cable lock sold separately)
Display mode Horizontal
frequency
(kHz)
Vertical
frequency
(Hz)
Pixel
clock
(MHz)
Sync
polarity
(Horizontal
/Vertical)
VESA, 640 x 480 31.5 59.9 25.2 -/+
VESA, 640 x 480 37.5 75.0 31.5 -/-
VESA, 720 x 400 31.5 70.1 28.3 -/+
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 +/+

About your monitor  │  15
Electrical specifications
Model P3421W
Video input signals HDMI 2.0/DisplayPort 1.2*, 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 / 1.5 A
(typical)
Inrush current • 120 V: 40 A (Max.) at 0°C (cold start)
• 240 V: 80 A (Max.) at 0°C (cold start)
Power consumption •0.2W(Offmode)
1
•0.3W(StandbyMode)
1
•31.5W(Onmode)
1
•126W(Max.)
2
•25.29W(Pon)
3
• 80.31 kWh (TEC)3
*HBR2 is supported.
1 As defined in EU 2019/2021 and EU 2019/2013.
2 Max 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.
VESA, 1152 x 864 67.5 75.0 108.0 +/+
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 +/-

16  │  About your monitor
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.
Physical characteristics
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.
Model P3421W
Signal cable type • Digital: DisplayPort, 20 pins
• Digital: HDMI, 19 pins
• Universal Series Bus: Type-C, 24 pins
• Universal Serial Bus: USB, 9 pins
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) 541.1 mm (21.30 in.)
Height (compressed) 391.1 mm (15.40 in.)
Width 815.7 mm (32.11 in.)
Depth 237.4 mm (9.35 in.)
Dimensions (without stand)
Height 365.4 mm (14.39 in.)
Width 815.7 mm (32.11 in.)
Depth 58.1 mm (2.29 in.)

About your monitor  │  17
Stand dimensions
Height (extended) 433.3 mm (17.06 in.)
Height (compressed) 386.5 mm (15.22 in.)
Width 307.0 mm (12.09 in.)
Depth 237.4 mm (9.35 in.)
Base 307.0 mm x 235.0 mm (12.09 in. x 9.25 in.)
Weight
Weight with packaging 14.9 kg (32.80 lb)
Weight with stand assembly and
cables
10.8 kg (23.89 lb)
Weight without stand assembly
(For wall mount or VESA mount
considerations - no cables)
6.7 kg (14.85 lb)
Weight of stand assembly 3.6 kg (7.92 lb)
Front frame gloss 17 ± 3

18  │  About your monitor
Environmental characteristics
Model P3421W
Compliant standards
• ENERGY STAR certified monitor
• EPEAT registered where applicable. EPEAT registration varies by country. See
www.epeat.net for registration status by country.
• RoHS-compliant
• TCO certified displays
• PVC/BFR/CFR free monitor (excluding external cables)
• Arsenic-free glass and Mercury-free for the panel only
Te m p e r at u re
Operating 0°C to 40°C (32°F to 104°F)
Non-operating • Storage: -20°C to 60°C (-4°F to 140°F)
• Shipping: -20°C to 60°C (-4°F to 140°F)
Humidity
Operating 20% to 80% (non-condensing)
Non-operating • Storage: 10% to 90% (non-condensing)
• Shipping: 10% to 90% (non-condensing)
Altitude
Operating 5000 m (16404 ft) (maximum)
Non-operating 12192 m (40000 ft) (maximum)
Thermal dissipation • 429.91 BTU/hour (maximum)
• 111.74 BTU/hour (typical)

About your monitor  │  19
Pin assignments
DisplayPort connector
Pin
number
20-pin side of the
connected signal cable
1ML3 (n)
2GND
3ML3 (p)
4ML2 (n)
5GND
6ML2 (p)
7ML1 (n)
8GND
9ML1 (p)
10 ML0 (n)
11 GND
12 ML0 (p)
13 GND
14 GND
15 AUX (p)
16 GND
17 AUX (n)
18 Hot Plug Detect
19 Re-PWR
20 +3.3 V DP_PWR

20  │  About your monitor
HDMI connector
Pin
number
19-pin side of the
connected signal cable
1TMDS DATA 2+
2TMDS DATA 2 SHIELD
3TMDS 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