Dell U2722DX User manual

Version: 01
Date: 2021/10/30
Service Manual - U2722D/DX

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.
15
14 16
13
Item Description Q'ty Remark
1 1
For EMEA Only, not for
other regions
2
Safety Mylar
1
13
4 1
15
6
IF BD
1
1 7
8 1
9
10
11 1
1
Joystick BD
12
1 13
1 14
USB BD
Panel
Key BD
Power BD
ASSY Chassis
1
1
15 1
1
ASSY Rear Cover
16
See “NOTE”
See “NOTE”
ASSY RISSER
See “NOTE”
See “NOTE”
USB-C 1.0 M cable (A to C)
HDMI 1.8 M cable (U2722DX Only)
Power cable
DisplayPort 1.8 M cable(U2722D Only)
ASSY BASE
ASSY Middle Frame

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.

4. How to connect and disconnect power cable/ connectivity 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.
S3
S2
S1
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.
S6
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.
S4
Use a Philips-head screwdriver to remove 4pcs
screws for unlocking mechanisms. Remove DP cap.
(No.1~4 screw size=M4x11; Torque=11±1kgfxcm)
Lift the rear cover up carefully. Disconnect the
joystick key cable and Usb EDP cable from the
connectors of the interface board, and then remove
the rear cover.
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)
23
41
3
2
1
2
1
2
S5
Use a Philips-head screwdriver to release one screw
for unlocking the USB board, then release the USB
board from the hooks of the middle bezel and then
remove the USB board unit.
(No.1screw size=M3x6, Torque=4±0.5kgfxcm)
1
Tear off 1pcs aluminum foil for unfixing the bracket,
and then disconnect the LED cable from the
connector of the interface board.
S7

5. Disassembly and Assembly Procedures
S10
S9
S11
S12
S8
Use a Philips-head screwdriver to remove 13pcs
screws for unlocking the middle bezel with the panel
module.
(No.1~13 screw size=M3x5, Torque=5±0.5kgfxcm)
3
11 10
13 12
8
2
9
4
5761
Disconnect the panel lamp from the connector of the
panel, then release the panel lamp cable from the
hooks of the middle bezel.
Tear off the tape on the back of panel module for
releasing the LED cable, then
middle bezel, and put it on a cushion foam, and then
tear off the mylar tape for releasing the LED board.
lift up and take away the
U
.
se a Philips-head screwdriver to remove 4pcs
screws for unlocking the bracket chassis module
with the panel
(No.1~4 Screw size= M3x5, Torque=5±0.5kgfxcm)
4
1
11
Move up the bracket, then push the earing-lock and
disconnect the LVDS cable away from the connectors
of the panel module.
Take away the bracket chassis module and then put
the bracket chassis module on a protective cushion.
S13

5. Disassembly and Assembly Procedures
Use a Philips-head screwdriver to remove
screws for interface board and power board.
6pcs
(No.1 screw size=M4x8, Torque=7±1kgfxcm;
No.2~6 screw size=M3x7.5, Torque=7±1kgfxcm)
S15
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.
S14
S16
1
3
4
2
65

5. Disassembly and Assembly Procedures
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 module.
Place a bracket chassis base on a protective
cushion, then stick 3pcs Silicon sheets on the
positions as the picture below shown.
5.2 Assembly Procedures:
S2
S1
Take a black mylar to insert the hooks of the bracket
to cover the power board, then tear off the gum
paper of the panel lamp cable.
S4
Take a interface board, connect 1pcs LVDS cable and
1pcs EDP cable to the connectors of the interface
board, then connect the cable of the power board with
interface board. Turn over the interface board and
locate the board and EDP cable into the bracket. Use
a Philips-head screwdriver to tighten 6pcs screws for
locking the interface board and power board.
(No.1 screw size=M4x8, Torque=7.5±0.5kgfxcm;
No.2~6 screw size=M4x8, Torque=7.5±0.5kgfxcm)
S3
Panel preparation: Take out 1pcs panel module from
the carton, remove the protective film by tearing off
the tapes, then examine the panel surface according
to inspection criteria of the panel. Turn over the
panel module to place the screen faced down for
later assembling.
S5
Move the bracket chassis module close to the panel
module, then connect the LVDS cable to the
connector of the panel module, then turn over the
bracket chassis and put it on the back of the bracket
chassis module.
S6
1
3
4
2
65