Dell P2722HE Manuale utente

Version: 01

Date: 2021/10/30

Service Manual - P2722HE

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

Panel Mylar

4 1

USB BD

8 1

11 1

Key BD

LED BD

Front trim

ASSY Middle Frame

Interface BD

Power BD

15 1

Main bracket

Joystick button

See “NOTE”

Riser ASSY

Base ASSY

Back cover

Panel

See “NOTE”

USB Type-C cable(1.8 meter)

Power cable

DisplayPort cable(1.8 meter)

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.

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)

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 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)

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)

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.

Disconnect the panel lamp cable away from the

connectors of the panel module and circuit board,

then release the cable by tearing off tape.

5. Disassembly and Assembly Procedures

Take away the

middle bezel, and put it on a fixture,

then tear off the mylar tape for releasing the LED

board

S10

S11

S13

S12

Take away the bracket chassis module and then put

the bracket chassis module on a protective cushion.

Put the panel module on a protective cushion, then

push the earing-locks and disconnect the LVDS

cable from the connector of the panel module.

Use a 2pcs

screws for unlocking the bracket with panel module.

Philips-head screwdriver to remove

(No.1~2 screw size=M3x4, Torque=5±0.5kgfxcm)

Disconnect the LED cable from the connector of the

board, then tear off 3pcs aluminum foil.

Lift up the panel with the bracket for releasing the

front bezel away from the panel.

Use a Philips-head screwdriver to remove 15pcs

screws for unlocking the middle bezel.

(No.1~13 screw size=M3x4, Torque=5±0.5kgfxcm;

No.14~15 screw size=M1.6x1.7, Torque=1±0.2kgfxcm)

12 1

S14

5. Disassembly and Assembly Procedures

S15 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 7pcs

screws for unlocking the power board and interface

board, and then release all the cables from the hooks.

(No.1 screw size=M4x8, Torque=6±0.5kgfxcm;

No.2~7 screw size=M3x7.5, Torque=6±0.5kgfxcm)

S16

S17

5. Disassembly and Assembly Procedures

5.2 Assembly Procedures: Take a mylar to insert the hooks of the bracket to

cover the power board.

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.

Paste 1pcs conductive foam on the specific position

as the picture below shown.

Turn over a power board and put the power board

into the correct position of the bracket chassis base

as the picture below shown.

Place a bracket chassis base on a protective

cushion, then paste 2pcs silicon sheet on the

position as the picture below shown.

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 7pcs screws for locking the

power board and interface board.

(No.1 screw size=M4x8, Torque=6±0.5kgfxcm;

No.2~7 screw size=M3x7.5, Torque=6±0.5kgfxcm)

Put the bracket chassis module on the back of LCD

module, then push the earing-locks and connect

LVDS cable and panel lamp cable to the connectors

of the panel module.

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