Dell P3221D Instructions for use

Product Announcement:
This product is certificated to meet RoHS
Directive and Lead-Free produced definition.
Using approved critical components only is
recommended when the situation to replace
defective parts. Vender assumes no liability
express or implied, arising out of any unauthorized
modification of design or replacing non-RoHS
parts. Service providers assume all liability.
Qualified Repairability:
Proper service and repair is important to the safe,
reliable operation of all series products. The
service providers recommended by vender should
be aware of notices listed in this service manual in
order to minimize the risk of personal injury when
perform service procedures. Furthermore, the
possible existed improper repairing method may
damage equipment or products. It is recommended
that service engineers should have repairing
knowledge, experience, as well as appropriate
product training per new model before performing
the service procedures.
NOTICE:
! To avoid electrical shocks, the products should be
connected to an authorized power cord, and turn
off the master power switch each time before
removing the AC power cord.
! To prevent the product away from water or
expose in extremely high humility environment.
! To ensure the continued reliability of this
product, use only original manufacturer’s
specified parts.
! To ensure following safety repairing behavior, put
the replaced part on the components side of
PWBA, not solder side.
! To ensure using a proper screwdriver, follow the
torque and force listed in assembly and
disassembly procedures to unscrew screws.
! Using Lead-Free solder to well mounted the
parts.
! The fusion point of Lead-Free solder requested in
the degree of 220°C.
1. Important Safety Notice

2. Exploded view diagram with list of items

3. Wiring Connectivity Diagram
AC In
Power BD
Panel
USB3.0
Down4
LED BD
FK key BD
HDMI 1.4 In DP 1.2 In Type C USB 2.0 Down 1 USB 2.0 Down 2
USB3.0
Down3
Interface BD
USB BD

4. Disassembly and Assembly Procedures
S2
4.1 Disassembly Procedures:
S1
S3
S5
S4
Remove the monitor stand base:
1. Place the monitor on a soft cloth or cushion.
2. Press and hold the stand-release button.
3. Lift the stand up and away from the monitor.
Use a Philips-head screwdriver to remove four
screws for unlocking mechanisms.
(No.1~4 screw size=M4x11; Torque=11±1kgfxcm)
23
41
Wedge your fingers between rear cover and the
middle bezel on the corners of the top side of the
monitor to release the rear cover, then use one hand
to press the middle bezel, the other hand to pull up
carefully the rear cover in order of arrow preference
for unlocking mechanisms of rear cover.
3
2
1
2
Lift the rear cover up carefully. Disconnect the
joystick key cable from the connector of the interface
board, and then remove the rear cover and put it
aside for later diasassembling.
Use a Philips-head screwdriver to remove 2pcs
screw for unlocking the key board, then tear off the
tapes and release the key board.
(No.1~2 screw size=M2x2.4, Torque=0.8~1kgfxcm)
1
2
Use a Philips-head screwdriver to release 1 screws
for unlocking the USB board, then disconnect the
USB FFC cable away from the connector of the
interface board and remove the Usb board unit.
(No.1screw size=M3x6, Torque=4±0.5kgfxcm)
S6
1
Necessary repair and test equipment:
1. Philips-head screwdriver

4. Disassembly and Assembly Procedures
S9
S11
S12
S8
S13
S10
Tear off 1pcs conductive tape and 1pcs aluminum foil
as the picture below shown. Use a Philips-head
screwdriver to remove 4pcs screws for unlocking the
middle bezel with front bezel.
(No.1~4 screw size=M2x3.5, Torque=2.5±0.5kgfxcm)
142
3
S7
Disconnect the LED cable from the connector of the
interface board, then release the LED cable by
tearing off the tapes.
Use a Philips-head screwdriver to remove 14pcs
screws for unlocking the middle bezel with the panel
module, then tear off the aluminum.
(No.1~14 screw size=M3x5, Torque=5±0.5kgfxcm)
3
14
2
1
4567
8
9
10
11
12
13
Take away the middle bezel. U
tear off
the tape for releasing the LED cable.
se a Philips-head
screwdriver to remove 1pcs screw for unlocking the
LED board with the middle bezel, and then
(No.1~3 screw size=M2x2.4, Torque=0.8±0.2kgfxcm
2
Lift up the panel with the bracket chassis for releasing
the front bezel away from the panel. Disconnect the
panel lamp cables away from the connectors of the
interface board and the panel module.
Use a 4pcs
screws for unlocking the bracket with panel module.
Philips-head screwdriver to remove
(No.1~4 screw size=M3x4, Torque=5±0.5kgfxcm)
32
14
Move up the bracket, then disconnect the 2pcs LVDS
cables away from the connectors of the panel.

4. Disassembly and Assembly Procedures
S14 S17
Use a Philips-head screwdriver to remove
screws for interface board and power board.
7pcs
(No.1 screw size=M4x8, Torque=7±1kgfxcm;
No.2~7 screw size=M3x7.5, Torque=7±1kgfxcm)
Remove the power board board and interface
board from the
disconnect all of the cables.
bracket chassis module carefully,
and then
Remove the Mylar tape from the hooks of the
bracket.
2
5
3
1
76
4
Take away the bracket chassis module and then put
the bracket chassis module on a protective cushion.
S15
S16

4. Disassembly and Assembly Procedures
4.2 Assembly Procedures:
Turn over a power board and put the power board
into the bracket chassis.
Place a bracket chassis base on a protective
cushion, then stick 1pcs Silicon sheet on the position
as the picture below shown.
S2
S1
S4
Take a interface board, connect 2pcs LVDS cable to
the connectors of the interface board, then connect
the cable of the power board to the connector of the
interface board. Turn over the interface board and
locate it into the bracket, then locate all the cables
into the correct position of the bracket. Use a Philips-
head screwdriver to tighten 7pcs screws for locking
the circuit board, .
(No.1 screw size=M4x8, Torque=7±1kgfxcm;
No.2~7 screw size=M3x7.5, Torque=7±1kgfxcm)
S3
Panel preparation: Take a panel and then examine
the panel surface according to inspection criteria.
Tear off the protective film of the panel screen, and
then turn over the panel to place screen faced down.
S6
S5
Take a mylar to insert the hooks of the bracket to
cover the power board as the following picture shown.
2
5
3
1
76
4
Put down the bracket chassis module on the back of
panel module, then connect the two LVDS cables to
the connectors of the panel module.
Use a 4pcs
screws for locking the bracket with panel module.
Philips-head screwdriver to tighten
(No.1~4 screw size=M3x4, Torque=5±0.5kgfxcm)
S7
32
14

4. Disassembly and Assembly Procedures
S11
S10
S12
S13
3
14
2
1
Take 1pcs LED board and 1pcs middle bezel, then
put the middle bezel into a fixture jip to fix the middle
bezel. Locate the LED board to the correct positions
of the middle bezel. Philips-head screwdriver
to tighten
Stick a big piece of mylar tape to cover
the LED board.
Use a
1pcs screw for locking the LED board with
middle bezel.
(No.1 screw size=M2x2.4, Torque=0.8~1kgfxcm)
Take 1pcs panel lamp cable to connect the circuit
board with the connectors of the panel module.
S8
S9
Take 1pcs front bezel, then lift up the panel with
bracket and assemble the front bezel with the panel
module.
2
Move the middle bezel with the LED board close to
the panel unit, then assemble the middle bezel with
the front bezel and panel module.
Tear off the papers of the tapes on the back of the
LED cable, and then fix the LED cable on the panel
with 2pcs tapes, then connect the LED cable with
the connector of the board.
Paste 1pcs aluminum foil to fix the bracket, LED
cable and LVDS cable on the specific position as the
picture below shown. Use a Philips-head screwdriver
to tighten 14pcs screws for locking the middle bezel
with the panel module.
(No.1~14 screw size=M3x5, Torque=5±0.5kgfxcm)
4567
8
9
10
11
12
13

4. Disassembly and Assembly Procedures
S16
Take 1pcs USB board, 1pcs LVDS cable, 1pcs
conductive foam. Connect the LVDS cable to the
connector of the USB board, then paste 1pcs
conductive foam on the back of the USB board, and
then locate the USB board into the correct
position of the middle bezel. Use a Philips-head
screwdriver to tighten 1pcs screw for locking the
USB unit with the middle bezel, then connect the
cable with assemble unit.
(No.1 screw size=M3x6, Torque=4±0.5kgfxcm)
Move the assembled rear cover close to the
panel unit, then connect the key cable to the
connector of interface board. Put down the rear
cover and push the rear cover on the positions
marked as the picture below shown for
mechanisms engagement.
S18
Paste 1pcs aluminum foil to cover the two LVDS
connectors, then use a Philips-head screwdriver to
tighten 4pcs screws for locking the middle bezel with
front bezel.
(No.1~4 screw size=M2x3.5, Torque=2.5±0.5kgfxcm)
S14
Paste 1pcs conductive tape to cover the panel lamp
connectors as the picture below shown.
S15
1
Take 1pcs joystick key and 1pcs OSD board,
assemble the joystick key with the OSD board.
Locate the board to the correct position of the rear
cover, then use a Philips-head screwdriver to tighten
2pcs screws for locking the board with rear cover.
Tear off the tape papers on the back of the cable,
and then fix the key cable with tapes.
(No.1 screw size=M2x2.4, Torque=0.9±0.1kgfxcm)
S17
1
2
142
3

4. Disassembly and Assembly Procedures
Take a stand base close to the monitor. Fit the two
tabs on the upper part of the stand into the grooves,
and then lower the stand so that the monitor
mounting area snaps onto the stand.
Lift up the monitor to check the gap between the
front bezel and the panel, then provide power supply
and a video signal to the monitor
, then turn on the
monitor for functionality check.
S20
S21
Use a Philips-head screwdriver to tighten 4pcs
screws for locking the rear cover with the assembled
unit. Stick 2pcs labels on the specific positions of the
rear cover as the picture below shown.
(No.1~4 screw size=M4x11; Torque=11±1kgfxcm)
S19
23
41

5. Trouble Shooting 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 o both your computer and the monitor.
2. Unplug the video cable from the back of the computer. To ensure proper Self-Test
operation, remove all digital and the analog cables from the back of computer.
3. Turn on the monitor.
The floating dialog box should appear on-screen (against a black background), if the
monitor cannot sense a video signal and is working correctly. While in self-test mode,
the power LED remains white. Also, depending upon the selected input, one of the
dialogs shown below will continuously scroll through the screen.
No HDMI Cable
The display will go into Standby mode in 4 minutes.
www.dell.com/P3221D
or
No DP Cable
The display will go into Standby mode in 4 minutes.
www.dell.com/P3221D
or
No USB-C Cable
The display will go into Standby mode in 4 minutes.
www.dell.com/P3221D
4. This box also appears during normal system operation if the video cable becomes
disconnected or damaged.
5. Turn o your monitor and reconnect the video cable; then turn on both your
computer and the monitor.
If your monitor screen remains blank after you use the previous procedure, check your
video controller and computer, because your monitor is functioning properly.

5. Trouble Shooting Instructions
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.
NOTE: You can run the built-in diagnostics only when the video cable is
unplugged and the monitor is in self-test mode.
To run the built-in diagnostics:
1. Ensure that the screen is clean (no dust particles on the surface of the screen).
2. Press the left directional navigation of Joystick for four seconds until a menu
appears on the screen.
3. Using the joystick control, highlight the Diagnostics option and press the
joystick button to start the diagnostics. A gray screen is displayed.
4. Observe if the screen has any defects or abnormalities.
5. Toggle the joystick once again until a red screen is displayed.
6. Observe if the screen has any defects or abnormalities.
7. Repeat steps 5 and 6 until the screen displays green, blue, black, and white
colors. Note any abnormalities or defects.
The test is complete when the text screen appears. To exit, toggle the joystick control
again.
If you do not detect any screen abnormalities upon using the built-in diagnostic tool,
the monitor is functioning properly. Check the video card and computer.

5. Trouble Shooting Instructions
Common problems
The following table contains general information about common monitor problems you
might encounter and the possible solutions:
Common
Symptoms
What You
Experience
Possible Solutions
No Video/
Power LED off
No picture • Ensure that the video cable connecting the
monitor and the computer is properly connected
and secure.
• Verify that the power outlet is functioning
properly using any other electrical equipment.
• Ensure that the power button is depressed fully.
• Ensure that the correct input source is selected
in the Input Source menu.
No Video/
Power LED on
No picture or no
brightness
• Increase brightness and contrast controls via
OSD.
• Perform monitor self-test feature check.
• Check for bent or broken pins in the video cable
connector.
• Run the built-in diagnostics.
• Ensure that the correct input source is selected
in the Input Source menu.
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.
• For more information on Dell Monitor Quality
and Pixel Policy, see Dell Support site at:
www.dell.com/support/monitors.
Stuck-on Pixels LCD screen has
bright spots
• Cycle power On-Off.
• Pixel that is permanently off is a natural defect
that can occur in LCD technology.
• For more information on Dell Monitor Quality
and PixelPolicy, see Dell Support site at:
www.dell.com/support/monitors.
Brightness
Problems
Picture too dim
or too bright
• Reset the monitor to factory settings.
• Adjust brightness and contrast controls via OSD.
Safety Related
Issues
Visible signs of
smoke or sparks
• Do not perform any troubleshooting steps.
• Contact Dell immediately.

5. Trouble Shooting Instructions
Common
Symptoms
What You
Experience
Possible Solutions
Intermittent
Problems
Monitor
malfunctions on
& off
• Ensure that the video cable connecting the
monitor to the computer is connected properly
and is secure.
• Reset the monitor to factory settings.
• Perform monitor self-test feature check to
determine if the intermittent problem occurs in
self-test mode.
Missing Color Picture missing
color
• Perform monitor self-test.
• Ensure that the video cable connecting the
monitor to the computer is connected properly
and is secure.
• Check for bent or broken pins in the video cable
connector.
Wrong Color Picture color
not good
• Change the settings of the Preset Modes
in the Color menu OSD depending on the
application.
• Adjust R/G/B value 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.
Image retention
from a static
image left on
the monitor for
a long period of
time
Faint shadow
from the static
image displayed
appears on the
screen
• Set the screen to turn o after a few minutes
of screen idle time. These can be adjusted in
Windows Power Options or Mac Energy Saver
setting.
• Alternatively, use a dynamically changing
screensaver.

5. Trouble Shooting Instructions
Product specific problems
Problem What you
experience
Possible solutions
Screen image is
too small
Image is
centered on
screen, but
does not fill
entire viewing
area
• Check the Aspect Ratio setting in the Display
menu OSD.
• Reset the monitor to factory settings.
Cannot adjust
the monitor
with the
buttons on the
front panel
OSD does not
appear on the
screen
• Turn o the monitor, unplug the monitor power
cable, plug it back, and then turn on the monitor.
No Input Signal
when user
controls are
pressed
No picture, the
LED light is
white
• Check the signal source. Ensure the computer
is not in the power saving mode by moving the
mouse or pressing any key on the keyboard.
• Check whether the signal cable is plugged
in properly. Connect the signal cable again, if
necessary.
• Reset the computer or video player.
The picture
does not fill the
entire screen
The picture
cannot fill the
height or width
of the screen
• Due to dierent video formats (aspect ratio) of
DVDs, the monitor may display in full screen.
• Run the built-in diagnostics.
No image
when using
USB Type-C
connection
to computer,
laptop, and so
on
Black screen • Verify if the USB Type-C interface of the device
can support DP alternate mode.
• Verify if the device required more than 65 W
power charging.
• USB Type-C interface of device cannot support
DP alternate mode.
• Set Windows to Projection mode.
• Ensure that the USB Type-C cable is not
damaged.

5. Trouble Shooting Instructions
Problem What you
experience
Possible solutions
No charging
when using
USB Type-C
connection
to computer,
laptop, and so
on
No charging • Verify if the device can support one of 5 V/9
V/15 V/20 V charging proles.
• Verify if the Notebook requires a >65 W power
adaptor.
• If the Notebook requires a >65 W power
adaptor, it may not charge with the USB Type-C
connection.
• Ensure that you use only Dell approved adapter
or the adapter that comes with the product.
• Ensure that the USB Type-C cable is not
damaged.
Intermittent
charging
when using
USB Type-C
connection to
computer,
laptop, and so
on
Intermittent
charging
• Check if the maximum power consumption of
device is over 65 W.
• Ensure that you use only Dell approved adapter
or the adapter that comes with the product.
• Ensure that the USB Type-C cable is not
damaged.
No image
when using DP
connection to
the PC
Black screen • Verify which DP standard (DP 1.1a or DP 1.2) is
your Graphics Card certied to. Download and
install the latest graphics card driver.
• Some DP 1.1a graphics card cannot support
DP 1.2 monitors. Go to OSD menu, under Input
Source selection, press and hold DP select
joystick key for 8 sec to change the monitor
setting from DP 1.2 to DP 1.1a.

5. Trouble Shooting Instructions
Universal Serial Bus (USB) specific problems
Specific
Symptoms
What You
Experience
Possible Solutions
USB interface is
not working
USB peripherals
are not working
• Check that your display is turned ON.
• Reconnect the upstream cable to your
computer.
• Reconnect the USB peripherals (downstream
connector).
• Turn o the monitor and turn it on again.
• Reboot the computer.
• Certain USB devices such as portable hard
drives require higher power source; connect the
drive to the computer directly.
SuperSpeed
USB 5Gbps
(USB 3.2 Gen1)
interface is
slow.
USB 3.2 Gen1
peripherals
working slowly
or not working
at all
• Check that your computer is USB 3.2 Gen1-
capable.
• Some computers have USB 3.2 Gen1, USB 2.0,
and USB 1.1 ports. Ensure that the correct USB
port is used.
• Reconnect the upstream cable to your
computer.
• Reconnect the USB peripherals (downstream
connector).
• Reboot the computer.
Wireless USB
peripherals
stop working
when a USB 3.2
Gen1 device is
plugged in
Wireless USB
peripherals
responding
slowly or only
working as
the distance
between itself
and its receiver
decreases
• Increase the distance between the USB 3.2 Gen1
peripherals and the wireless USB receiver.
• Position your wireless USB receiver as close as
possible to the wireless USB peripherals.
• Use a USB-extender cable to position the
wireless USB receiver as far away as possible
from the USB 3.2 Gen1 port.
USB is not
working
No USB
functionalities
Refer to input source and USB pairing table.
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