Dell P2222H User manual

Version: 01
Date: 2021/10/30
Service Manual - P2222H

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
NOTE:
For replacement of power cord, connectivity cable and external power supply (if applicable), contact Dell:
1. Go to https://www.dell.com/support.
2. Verify your country or region in the Choose A Country/Region drop-down menu at the bottom-right corner of the page.
3. Click Contact Us next to the country dropdown.
4. Select the appropriate service or support link based on your need.
5. Choose the method of contacting Dell that is convenient for you.
Item Description Q'ty Remark
1 1
For EMEA Only, not for
other regions
2
Panel Mylar
1
13
4 1
15
6
USB BD
1
1 7
8 1
9
10
11 1
1
Key BD
12
1 13
1 14
LED BD
Front trim
ASSY Middle Frame
Interface BD
Power BD
1
1
15 1
1
Main bracket
16
Joystick button
See “NOTE”
See “NOTE”
Riser ASSY
Base ASSY
Back cover
Panel
1 17
1 18
19 1
See “NOTE”
See “NOTE”
See “NOTE”
USB 3.0 upstream cable
VGA cable (Japan Only)
HDMI 1.4 cable (Brazil Only)
Power cable
DisplayPort 1.2 cable
17
16 18
15 19

3. Wiring Connectivity Diagram

4. How to connect and disconnect power cable/ connectivity cable
WARNING: To change power cable/ connectivity cable, switch off power before unplugging the cable and replugging in required
cable.

5. Disassembly and Assembly Procedures
5.1 Disassembly Procedures:
Tool Required:
List the type and size of the tools that would typically can be
used to disassemble the product to a point where components
and materials requiring selective treatment can be removed.
Tool Description:
- Screwdriver(Phillip head) #1
- Screwdriver(Phillip head) #2
- Penknife
- Soldering iron and absorber
NOTE:
This “Disassembly and Assembly Procedures” is for EMEA only,
not for other regions. Please note that Dell will deem warranty void
if any disassembly is done on the monitors.
Wedge your fingers between the 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..
Use a Philips-head screwdriver to remove four
screws for unlocking mechanisms.
(No.1~4 screw size=M4x10; Torque=12±0.5kgfxcm)
S3
S2
S1
23
41
1
3
22
S1
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.
Lift the rear cover up carefully. Disconnect the key
cable and USB FFC cable from the connectors of
the interface board, and then remove the rear cover.
S4
Tear off 2pcs aluminium foils for unfixing the bracket
Tear off 1pcs acetate tape, and then release the
panel lamp cable from the hook of the middle bezel.
.
S7
Use a Philips-head screwdriver to remove 2pcs
screws for unlocking the joystick key board unit, then
tear off the tapes and release the USB board.
(No.1~2 screw size=M2x3.3,Torque=1±0.2kgfxcm)
S5
Use a Philips-head screwdriver to remove one screw
for unlocking the USB board unit, then release the
USB board unit and put it aside.
(No.1 screw size=M3x6, Torque=4±0.5kgfxcm)
12
1
aluminum foil
conductive tape
S6

5. Disassembly and Assembly Procedures
Disconnect the LED cable from the connector, then
release the LED cable by tearing off 2pcs tapes.
Take away the
.
middle bezel, and put it on a fixture,
then tear off the mylar tape for releasing the LED
board
S10
Lift up the panel with the bracket for releasing the
front bezel away from the panel. Use a Philips-head
screwdriver to remove one screw for unlocking the
bracket with panel.
(No.1 screw size=M3x0.5x3, Torque=4±0.5kgfxcm)
Use a Philips-head screwdriver to remove 11pcs
screws for unlocking the middle bezel with the panel.
(No.1~9 screw size=M3x4, Torque=5±0.5kgfxcm;
No.10~11 screw size=M1.6x1.7, Torque=1±0.2kgfxcm)
S8
2
10
1
11
3
89
7
45
6
1
S9
S11
Take away the bracket chassis module and then put
the bracket chassis module on a protective cushion.
S13
Put the panel module on a protective cushion, then
disconnect the panel lamp cable from the connector
of panel module, then unplug the LVDS cable from
the connector of the panel module.
S12

5. Disassembly and Assembly Procedures
Remove the black Mylar from the hooks of the
bracket as the picture below shown.
Remove the interface board and power board from
the bracket chassis module carefully, and disconnect
all the cables.
Use a Philips-head screwdriver to remove 5pcs
screws for unlocking the power board and interface
board, and then release all the cables from the
hooks.
(No.1~4 screw size=M3x7.5, Torque=6±0.5kgfxcm;
No.5 screw size=M4x8, Torque=6±0.5kgfxcm)
S14
S16
Use a Hex-head screwdriver to remove two screws
for unlocking the D-Sub connector.
(No.1~2 screws size=M3x8, Torque=6±0.5kgfxcm)
S17
21
3
6
41
2
S15

5. Disassembly and Assembly Procedures
Take a mylar to insert the hooks of the bracket to
cover the power board.
Panel preparation: Examine the panel surface
according to inspection criteria. Turn over the panel
to place the screen faced down for later assembling.
Turn over a power board and put the power board
into the bracket chassis, locate the panel power
cable into the hook of the bracket chassis.
Place a bracket chassis base on a protective
cushion.
5.2 Assembly Procedures:
S2
S1
Take a interface board, connect a LVDS cable to the
connector 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. Use a Philips-head
screwdriver to tighten 5pcs screws for locking the
power board and interface board.
(No.1~4 screw size=M3x7.5, Torque=6±0.5kgfxcm;
No.5 screw size=M4x8, Torque=6±0.5kgfxcm)
S3
Put the bracket chassis module on the back of LCD
module, then connect LVDS cable and panel lamp
cable to the connectors of the panel module.
3
6
41
2
Use a Hex-head screwdriver to tighten 2pcs screws
for locking the D-Sub connector.
(No.1~2 screw size=M3x8, Torque=6±0.5kgfxcm)
21
S4
S6
S5
S7

5. Disassembly and Assembly Procedures
Use a fixture jip to fix the bracket chassis, then paste
2pcs aluminum foil on the specific position to fix the
bracket chassis module. Locate the panel lamp into
the hook of the middle bezel, then fix the panel lamp
cable with 1pcs acetate tape as the picture below
shown.
Take 1pcs LED board and 1pcs middle bezel, then
put the middle bezel into a fixture jip to fix the middle
bezel. Tear off the release paper on the back of the
board, and then paste the LED board on the correct
position of the middle bezel, then paste 1pcs mylar
tape to cover the LED board.
Fix the LED cable with 2pcs tapes on the middle
bezel by tearing off papers., and then connect the
LED cable to the connector of the interface board.
1
2
10
1
11
3
89
7
45
6
Assemble the middle bezel with the front bezel and
panel module, then adjust the middle bezel for two
parts firmly attachment.
S10
Take a front bezel, then lift up the panel with bracket
and assemble the front bezel with the unit. Use a
Philips-head screwdriver to tighten 1pcs for locking
the bracket with panel module.
(No.1 screw size=M3x0.5x3, Torque=4±0.5kgfxcm)
S9
S8
Use a Philips-head screwdriver to tighten 11pcs
screws for locking the middle bezel with the panel.
(No.1~9 screw size=M3x4, Torque=5±0.5kgfxcm;
No.10~11 screw size=M1.6x1.7, Torque=1±0.2kgfxcm)
S11
aluminum foil
conductive tape
S12
S13

5. Disassembly and Assembly Procedures
Use a Philips-head screwdriver to tighten 4pcs
screws for locking rear cover with the assembled
unit. Stick 2pcs labels on the specific positions as
the picture below shown
(No.1~4 screw size=M4x10; Torque=12 0.5kgfxcm)±
Move the assembled rear cover close to the
panel unit, then connect the key cable and USB
FFC cable to the connectors 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.
S16
Take 1pcs USB board and a connect cable. Connect
the cable to the USB board, then paste 1pcs
conductive foam on the back of the board. Locate
the USB board into the hook of the middle bezel.
Use a Philips-head screwdriver to tighten one screw
for locking the USB unit with middle bezel.
(No.1 screw size=M3x6, Torque=4±0.5kgfxcm)
S14
S17
23
41
Take 1pcs assembled stand base, then fit the two
tabs on the upper part of the stand into the grooves
on the back of the monitor, and then press the stand
so that the monitor mounting area snaps onto the
stand.
S18
1
Take 1pcs joystick key, 1pcs joystick board and 1pcs
rear cover, then assemble the joystick key with board.
Locate the joystick board to the correct position of the
rear cover, then use a Philips-head screwdriver to
tighten 2pcs screws for locking the joystick board with
rear cover, then fix the key cable with 2pcs tapes.
(No.1~2 screw size=M2x3.3,Torque=1±0.2kgfxcm)
12
S15

5. Disassembly and Assembly Procedures
L
video signal to the monitor
ift up the monitor, then provide power supply and a
, then turn on the monitor
for functionality check.
S19

6. Trouble Shooting Instructions
Self-Test
Your monitor provides a self-test feature that allows you to check if 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. Disconnect all video cables from the monitor. This way, the computer doesn’t
have to be involved.
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 VGA Cable
The display will go into Standby mode in 4 minutes.
www.dell.com/P2X22H
or
No HDMI Cable
The display will go into Standby mode in 4 minutes.
www.dell.com/P2X22H
or
No DP Cable
The display will go into Standby mode in 4 minutes.
www.dell.com/P2X22H
4. This box also appears during normal system operation, if the video cable
becomes disconnected or damaged.
5. Turn Off 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.

6. Trouble Shooting Instructions
Built-in diagnostics
Your monitor has a built-in diagnostic tool that helps you determine if any screen
abnormality you experience 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. Move and hold the joystick up/down/left/right about 4 seconds until a pop-
up menu appears.
Select option:
3. Move the joystick to highlight the Diagnostic icon then press the joystick
to confirm. A gray test pattern appears.
Select option:
4. Carefully inspect the screen for abnormalities.
5. Press the joystick to change the test patterns.
6. Repeat steps 4 and 5 to inspect the display in red, green, blue, black, white,
and text screens.
7. Press the joystick to end the diagnostic program.

6. Trouble Shooting Instructions
Common problems
The following table contains general information about common monitor problems
you might encounter and the possible solutions:
Common
Symptoms
Possible Solutions
No Video/Power
LED off
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 pressed.
• Ensure that the correct input source is selected via the Input
Source menu.
No Video/Power
LED on
• Increase brightness and contrast controls using the 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 via the Input
Source menu.
Poor Focus • Eliminate video extension cables.
• Reset the monitor to Factory Settings (Factory Reset).
• Change the video resolution to the correct aspect ratio.
Shaky/Jittery
Video
• Reset the monitor to Factory Settings (Factory Reset).
• Check environmental factors.
• Relocate the monitor and test in another room.
Missing Pixels • 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/pixelguidelines.
Stuck-on Pixels • 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/pixelguidelines.
Brightness
Problems
• Reset the monitor to Factory Settings (Factory Reset).
• Adjust brightness & contrast controls via OSD.
Geometric
Distortion
• Reset the monitor to Factory Settings (Factory Reset).
• Adjust horizontal & vertical controls via OSD.

6. Trouble Shooting Instructions
Horizontal/
Vertical Lines
• Reset the monitor to Factory Settings (Factory Reset).
• 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
• Reset the monitor to Factory Settings (Factory Reset).
• Perform monitor self-test feature check to determine if the
scrambled screen appears in self-test mode.
• Check for bent or broken pins in the video cable connector.
• Restart the computer in the safe mode.
Safety Related
Issues
• Do not perform any troubleshooting steps.
• Contact Dell immediately.
Intermittent
Problems
• Ensure that the video cable connecting the monitor to the
computer is connected properly and is secure.
• Reset the monitor to Factory Settings (Factory Reset).
• Perform monitor self-test feature check to determine if the
intermittent problem occurs in self-test mode.
Missing Color • Perform monitor self-test feature check.
• 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 • Change the Color Setting Mode in the Color Settings
OSD to Graphics or Video depending on the application.
• Try different Preset Modes in Color settings OSD. Adjust
R/G/Bvalue in Custom Color in Color settings OSD.
• Change the Input Color Format to RGB or
YCbCr(digital)/YPbPr(analog) in the Color settings
OSD.
• Run the built-in diagnostics.
Image retention
from a static
image left on
the monitor for
a long period of
time
• Set the screen to turn off 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.
Video Ghosting
or Overshooting
• Change the Response Time in the Display OSD to Normal,
or Fast depending on your application and usage.

6. Trouble Shooting Instructions
Product-specific problems
Specific
Symptoms
Possible Solutions
Screen image is too
small
• Check the Aspect Ratio setting in the Display settings
OSD.
• Reset the monitor to Factory Settings (Factory Reset).
Cannot adjust the
monitor with the
joystick
• Turn Off the monitor, unplug the power cord, plug it back,
and then turn On the monitor.
• Check whether the OSD menu is locked. If yes, move
and hold the joystick up/down/left/right for 4 seconds to
unlock (for more information, see Menu and Power button
lock).
No Input Signal
when user controls
are pressed
• Check the signal source. Ensure the computer is not in
Standby Mode by moving the mouse or pressing any key
on the keyboard.
• Check if the video cable is plugged in properly. Disconnect
and reconnect the video cable if necessary.
• Reset the computer or video player.
The picture does
not fill the entire
screen
• Due to different video formats (aspect ratio) of DVDs, the
monitor may display in full screen.
• Run the built-in diagnostics.
Universal Serial Bus (USB) specific problems
Specific
Symptoms
Possible Solutions
USB interface is
not working
• Check that your monitor is turned On.
• Reconnect the upstream cable to your computer.
• Reconnect the USB peripherals (downstream connector).
• Turn off the monitor and turn it on again.
• Reboot the computer.
• Certain USB devices such as portable hard drive require
higher power source; connect the drive to the computer
directly.
SuperSpeed USB
5 Gbps (USB 3.2
Gen1) interface is
slow
• Check that your computer is SuperSpeed USB 5 Gbps
(USB 3.2 Gen1)-compatible.
• Some computers have USB 3.2, 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 device is
plugged in
• Increase the distance between the USB 3.2 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 port.