Dell U4323QE Manuel utilisateur

Version: 01

Date: 2022/07/22

Service Manual - U4323QE

! To prevent the product away from water or

expose in extremely high humility environment.

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.

Product Announcement:

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.

Qualified Repairability:

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 ensure following safety repairing behavior, put

the replaced part on the components side of

PWBA, not solder side.

! To ensure the continued reliability of this

product, use only original manufacturer’s

specified parts.

! The fusion point of Lead-Free solder requested in

the degree of 220°C.

! 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.

1. Important Safety Notice

2. Exploded view diagram with list of items

2. Verify your country or region in the Choose A Country/Region drop-down menu at the bottom-right corner of the page.

NOTE:

5. Choose the method of contacting Dell that is convenient for you.

For replacement of power cord, connectivity cable and external power supply (if applicable), contact Dell:

3. Click Contact Us next to the country dropdown.

1. Go to https://www.dell.com/support.

4. Select the appropriate service or support link based on your need.

ItemDescriptionQ'tyRemark

11

ForEMEAOnly,notfor

otherregions

21

41

6Speaker 1

81

131

114

Power BD

Panel

Interface BD

QAP

1

Stand Base ASSY

See “NOTE”

USB_C Gen2 1.0 M cable(A to C)

Power cable

ASSY Middle Frame

See “NOTE”

Premium High Speed HDMI 1.8 M cable

DisplayPort 1.8 cable

10 1

Main bracket ASSY

1

Rear Cover

11 13

USB_C Gen2 PD 3.0 1.0 M cable(A to C)

3. Wiring Connectivity Diagram

LED BD

Speaker

USB BD

Interface board

43 inch LCD panel

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:

- Penknife

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

- 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.

3. Lift the stand up and away from the monitor.

Remove the monitor stand base:

1. Place the monitor on a soft cloth or cushion.

2. Press and hold the stand-release button.

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.

screws for unlocking mechanisms.

Use a Philips-head screwdriver to remove 4pcs

(No.1~4 screw size=M4x11; Torque=11±1kgfxcm)

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 disassembling

(No.1~2 screw size=M2x2.4,Torque=1±0.2kgfxcm)

Use a Philips-head screwdriver to remove 2pcs

screw for unlocking the joystick board, then tear off

the tapes and release the joystick board.

Use a Philips-head screwdriver to remove 7pcs

screws for unlocking the two speakers. Release the

left speaker cables from the probers of the middle

frame, and then disconnect the speaker cable, LED

cable and USB cable away from the connector.

(No.1~7 screw size=M3x8, Torque=4±1kgfxcm)

5. Disassembly and Assembly Procedures

S12

S11

S10

(No.1~4 screw size=M3x4, Torque=3.5±0.5kgfxcm)

Use a Philips-head screwdriver to remove 4pcs

screw for unlocking the USB unit with the middle

frame, and then release the USB unit from the hooks

of middle frame.

Use a Philips-head screwdriver to remove 2pcs

screws for unlocking the USB cover, remove the USB

cover, then use a Philips-head screwdriver to remove

1pcs screw for locking the USB board with the USB

bracket. Disconnect the USB connective cable.

No.2~3 screw size=M3x4, Torque=1±0.2kgfxcm)

(No.1 screw size=M3x3, Torque=3.5±0.5kgfxcm;

Release the speakers’ cable to from the hooks of the

middle frame, then remove the speakers.

3456

19 18 17 16

28 27

Tear off 1pcs aluminum foil to release the bracket

chassis. Use a Philips-head screwdriver to remove

28pcs screws for unlocking the middle frame with the

panel module.

(No.1~28 Screw size= M3x0.5x4, Torque=5±0.5kgfxcm)

Tear off 3pcs aluminum foil, then use a Philips-head

screwdriver to remove 4pcs screws for locking the

bracket chassis module with the panel.

(No.1~4 Screw size= M6x12, Torque=9±0.5kgfxcm)

Lift up the bracket chassis, and disconnect the LVDS

cable from the connector of the T-CON board of

panel module, then put the bracket chassis on a

protective cushion for later disassembling.

5. Disassembly and Assembly Procedures

No.2~8 screw size=M3x7.5, Torque=6±0.5kgfxcm)

Use a Philips-head screwdriver to remove 9pcs

screws for unlocking power board and interface

board with the bracket.

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

Remove the circuit boards from the bracket

chassis module carefully, and then disconnect all

of the cables.

S16

S17

824

(No.1~2 Screw size= M3x0.5x4, Torque=3~5kgfxcm)

Tear off 4pcs rubbers , then use a Philips-head

screwdriver to remove 2pcs screws for unlocking the

small bracket with T-Con board, then remove the

small bracket, then release the LED key cable by

tearing off tapes on the back of the cable.

S13

Lift up the middle frame and put it into a fixture, tear

off the maylar tape for releasing the LED key board

away from the middle frame.

S14

Remove 2pcs shading tape on the left and right side

of the panel corner, then remove 27pcs acetate

tapes on the specific positions of the back of panel.

S15

5. Disassembly and Assembly Procedures

Put 1pcs power board into the bracket, then use a

Philips-head screwdriver to tighten 4pcs screws for

locking the power board.

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

No.2~4 screw size=M3x7.5, Torque=6±0.5kgfxcm)

Place a bracket chassis base on a protective

cushion, then stick 5pcs Silicon sheets on the

position as the picture below shown.

5.2 Assembly Procedures:

(No.6~9 screw size=M3x7.5, Torque=6±0.5kgfxcm)

Take 1pcs interface board, connect a LVDS cable to

the connector of the interface board, then connect

the power connective cables to the interface board.

Turn over the interface board and locate it into the

bracket. Use a Philips-head screwdriver to tighten

4pcs screws for locking the interface board.

Panel preparation: Take out 1pcs panel module from

the carton, remove the protective film by tearing off

all the tapes of screen and four sides, then examine

the panel surface according to inspection criteria

carefully.

Take 1pcs Dell nameplate, then use a locating fixture

to fix the nameplate to the front bezel of the module,

and then move the whole unit into a laminating

fixture, use the laminating fixture to press the

nameplate with the bottom side of the panel module

firmly attachment.

Turn over the panel module to place screen faced

down. Paste 2pcs shading tape on the left and right

side of the panel corner, then paste 27pcs acetate

tapes on the specific position of the back of panel as

the picture below shown.

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