Dell U4320Q Gebrauchsanweisung

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

Mid frame

key board Speaker

Panel Inter face board

Power board

Min bracket Rear cover

Stand

Usb board

3. Wiring Connectivity Diagram

2nwoD0.3BSU1nwoD0.3BSUtuooiduACepyTnI4.11PDnI0.21IMDHAC In

Power Board

Panel

Function Key Board

TypeC

Down

USB3.0

Down3

DP 1.4 InHDMI 2.0 In

Interface Board

Speaker

USB Board

4. Disassembly and Assembly Procedures

4.1 Disassembly Procedures:

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 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 4pcs

screws for unlocking mechanisms.

(No.1~4 screw size=M6x12; Torque=9±0.5kgfxcm)

Lift the rear cover up carefully. Disconnect the USB

LVDS cable and function key cable from the

connectors of the interface board, and then remove

the rear cover.

Use a Philips-head screwdriver to remove 1pcs

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)

Use a Philips-head screwdriver to remove 8pcs

screws for unlocking the speakers with middle bezel.

Release the speakers’ cables from the hooks of the

middle bezel, and then disconnect the speaker cable

away from the connector of the circuit board.

(No.1~8 screw size=M3x8, Torque=5±0.5kgfxcm)

Necessary repair and test equipment:

1. Philips-head screwdriver

4. Disassembly and Assembly Procedures

S10

S11

se a Philips-head screwdriver to remove 2pcs

screws for unlocking the heat-sink. se a Philips-

head screwdriver to remove 26pcs screws for

unlocking the middle bezel, then remove the bezel.

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

34 5 6

20 19 18 17 16

Put the rear cover with function key board into a Jip.

Tear off the mylar tape on the function key board,

then use a Philips-head screwdriver to tighten 3pcs

screws for locking the function key board with the

front bezel.

(No.1~3 Screw size= M2x2.4, Torque=0.8±0.2kgfxcm)

Tear off acetate tape, then disconnect the panel lamp

cables from the connectors of the circuit board.

se 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, then

put the bracket chassis on a protective cushion.

Use a Philips-head screwdriver to remove 2pcs

screws for unlocking the small bracket with T-Con

board, then remove the small bracket.

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

S12

4. Disassembly and Assembly Procedures

S15

S14

S13

Remove 2pcs shading tape on the left and right side

of the panel corner, then remove 32pcs acetate

tapes on the specific positions of the back of panel.

Use a Philips-head screwdriver to remove

screws for unlocking power board and interface

board.

9pcs

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

No.2~9 screw size=M3x7.5, Torque=6±0.5kgfxcm)

Remove the circuit boards from the

disconnect all

of the cables.

bracket

chassis module carefully, and then

Turn over the bracket chassis module. Remove the

Mylar from the hooks of the bracket, and then use a

Philips-head screwdriver to remove screws for

unlocking AC power outlet.

two

(No.1~2 screw size=M3x10, Torque=6±0.5kgfxcm)

S16

452

4. Disassembly and Assembly Procedures

4.2 Assembly Procedures:

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

Philips-head screwdriver to tighten 5pcs screws for

locking the power board.

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

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

Place a bracket chassis base on a protective

cushion, then stick 3pcs Silicon sheets on the

position as the picture below shown.

Use a two screws

for locking the AC-power outlet connector.

Philips-head screwdriver to tighten

(No.1~2 screw size=M3x8, Torque=6~8kgfxcm)

Take 1pcs interface board, connect a LVDS cable to

the connector of the interface board, then connect

the power connective cable to the 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.

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

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 front bezel of the panel module

firmly attachment.

4. Disassembly and Assembly Procedures

Plug 2pcs panel lamp cables to the connectors of

the circuit board, then fix the cables with tapes

pasted on the panel module.

Take 1pcs function key board and 1pcs middle bezel,

and then locate the function board into the specific

position of the middle bezel. Put the unit into a fixture,

use

Paste 1pcs mylar tape to cover the

function key board.

a Philips-head screwdriver to tighten 3pcs

screws for locking the function key board with the

middle bezel.

(No.1~3 Screw size= M2x2.4, Torque=0.8±0.2kgfxcm)

Adjust the bracket chassis module, and then u

se a

Philips-head screwdriver to tighten 4pcs screws for

locking the bracket chassis module with the panel

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

Take 1pcs small bracket to assemble with T-Con

board, then use a Philips-head screwdriver to tighten

2pcs screws for locking the small bracket with T-Con

board.

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

Move the bracket chassis module close to the panel

module, then connect the LVDS cable to the

connector of the T-Con board, then put the bracket

on the back of the panel module.

S10

S11

S12

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 32pcs acetate

tapes on the specific position of the back of panel as

the picture below shown.

4. Disassembly and Assembly Procedures

S15

Take a pair of speakers to locate the probers of the

middle bezel, then locate the speakers’ cable to the

hooks of the middle bezel, and then connect the

speaker cable to the connector of the circuit board.

Use a Philips-head screwdriver to tighten 8pcs

screws for locking the speakers with middle bezel.

(No.1~8 screw size=M3x8, Torque=5±0.5kgfxcm)

S14

Move the assembled rear cover close to the

panel unit, then connect the USB LVDS cable and

function key 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, 1pcs conductive foam, 1pcs

LVDS cable and 1pcs rear cover. Connect the LVDS

cable to the connector of the USB board, then paste

1pcs conductive foam on the back of the USB board,

and then locate the USB board into the correct

position of the rear cover. Use a Philips-head

screwdriver to tighten 1pcs screw for locking the

USB unit with the rear cover.

(No.1 screw size=M3x6, Torque=4±0.5kgfxcm)

Assemble the middle

the unit, then settle and paste the function key cable

with tapes as the picture below shown. U

bezel with function key board to

se a Philips-

head screwdriver to tighten 26pcs screws for locking

the middle bezel with the panel module. se a

Philips-head screwdriver to lock 2pcs screws for

locking the heat-sink.

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

S13

34 5 6

20 19 18 17 16

Take a stand base close to the monitor. Fit the two

tabs on the upper part of the stand into the grooves

on the back of the monitor, and then lower the stand

so that the monitor mounting area snaps onto the

stand.

Use a protective bag to pack the stand base, then lift

up the monitor to checking the gap between the front

bezel with panel module , then provide power supply

and a video signal to the monitor

, then turn on the

monitor for functionality check.

S18

S19

Use a Philips-head screwdriver to tighten four

screws for locking mechanisms. Stick 1pcs label on

the specific positions as the picture below shown.

(No.1~4 screw size=M6x12; Torque=9±0.5kgfxcm)

S17

4. Disassembly and Assembly Procedures

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