Dell U2722DX Bedienungsanleitung

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.

14 16

Item Description Q'ty Remark

1 1

For EMEA Only, not for

other regions

Safety Mylar

4 1

IF BD

8 1

11 1

Joystick BD

USB BD

Panel

Key BD

Power BD

ASSY Chassis

15 1

ASSY Rear Cover

See “NOTE”

ASSY RISSER

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.

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.

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.

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)

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)

Tear off 1pcs aluminum foil for unfixing the bracket,

and then disconnect the LED cable from the

connector of the interface board.

5. Disassembly and Assembly Procedures

S10

S11

S12

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)

11 10

13 12

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

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)

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

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:

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.

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)

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.

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.

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