Dell UltraSharp U2421HE Manual de usuario

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

Panel

Power Button

OSD Button

Front trim

Key board

Key mylar

Power myalr

Power board

Interface board

Stand

Back Cover

Main chassis

Key Board

3. Wiring Connectivity Diagram

Audio out

LED DRIVER

HDMI1 DP1 DP2 USB1 USB2 USB3

Panel

Interface board

FK board

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.

Use a Philips-head screwdriver to remove four

screws for unlocking mechanisms.

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

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.

Necessary repair and test equipment:

1. Philips-head screwdriver

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 USB

FFC cable from the connector of the interface board,

and then remove the rear cover.

Tear off 1pcs aluminium foil for unfixing the function

key cable.

Tear off 2pcs acetate tape for releasing the panel

lamp cables. Use a proper tool to release the

function key cable from the connector, then pull the

function key cable high for releasing the function key

cable as the picture below shown.

4. Disassembly and Assembly Procedures

se a Philips-head screwdriver to remove 2pcs

screws(left and right) for unlocking the front bezel

with the panel module, then disassemble the front

bezel with the unit and put it aside

(No.1~2 Screw size= M3x0.5x4, Torque=3~4kgfxcm)

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=1±0.2kgfxcm)

S10

S11

S12

S13

Use a Philips-head screwdriver to remove 5pcs

screws for unlocking the front bezel with the

assembled unit.

(No.1~5 screw size=M2x2.7, Torque=3±0.5kgfxcm)

Tear off 2pcs acetate tapes for releasing the panel

lamp cables, then unplug the panel lamp cables from

the connectors of the panel module and power board.

Use a Philips-head screwdriver to remove 4pcs

screws for unlocking the bracket chassis module.

(No.1~4 Screw size= M3x0.5x3, Torque=5~6kgfxcm)

Disconnect the LVDS cable from the connector of

the panel module. Lift up the bracket chassis, and

then put the bracket chassis on a protective cushion.

4. Disassembly and Assembly Procedures

Remove the circuit boards from the

disconnect all of the cables.

bracket

carefully, and then

S15

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

S14

Use a Philips-head screwdriver to remove screws

for unlocking power board and interface board.

7pcs

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

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

4. Disassembly and Assembly Procedures

4.2 Assembly Procedures:

Turn over a power board and put the power board

into the bracket chassis, settle the panel power

cable to the correct position.

Place a bracket chassis base on a protective

cushion, then stick 6pcs Silicon sheets on the

positions as the picture below shown.

Use a two screws

for locking the AC-power outlet connector. Take a

mylar to insert the hooks of the bracket to cover the

power board.

Philips-head screwdriver to tighten

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

Take a interface board, connect 1pcs 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 6pcs screws for locking the

interface board.

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

Take 1pcs driver board, connect the correct cables of

the power board to the connector of the driver board,

then turn over the driver board and locate it into the

bracket. Use a Philips-head screwdriver to tighten

6pcs screw for locking power board, interface board

and the driver board with the bracket chassis, then

locate the cables to the hooks of the bracket chassis

module.

(No.2~7 screw size=M4x8, Torque=6±0.5kgfxcm)

4. Disassembly and Assembly Procedures

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= M3x0.5x3, Torque=5~6kgfxcm)

S10

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. Turn over the panel

to place 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.

Connect the panel power cables to the two

connectors of the panel module, then fix the cables

with 2pcs acetate tape as the following picture.

Take 1pcs function key board, 1pcs lens and 1pcs

middle bezel, assemble the lens with the front bezel,

and then locate the function board into the specific

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

use

Stick 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

front bezel.

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

4. Disassembly and Assembly Procedures

Use a Philips-head screwdriver to tighten 5pcs

screws for locking the front bezel with the panel.

(No.1~5 screw size=M2x2.7, Torque=3±0.5kgfxcm)

Stick 2pcs acetate tape to fix the panel lamp cables.

Tear off all the double-faced adhesive tapes which

sticked on the back of the function key cable, and

then fix the cables with the double-faced tape. Use a

proper tool to connect the function key cable to the

connector of the interface board.

S12

S11

Assemble the front

then u

bezel with the assembled unit,

se a Philips-head screwdriver to tighten 2pcs

screws(left and right) for locking the front bezel.

(No.1~2 Screw size= M3x0.5x4, Torque=3~4kgfxcm)

S13

S14

Take a USB board, a USB hub and a connect cable.

Connect the cable to the USB board, then locate the

USB board into the USB hub. Stick 1pcs aluminum

foil on one side of the USB hub, then locate the

USB unit into the hook of a rear cover. Use a

Philips-head screwdriver to tighten one screw for

locking the USB unit with the rear cover. Tear off the

adhesive paper of the left and right side of rear cover.

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

S15

Stick 1pcs aluminum foil on the specific position to fix

the function key cable as the picture below shown.

Move the assembled rear cover close to the

panel unit, then connect the USB FFC cable to

the connector 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

Use a Philips-head screwdriver to tighten 4pcs

screws for locking the rear cover with the assembled

unit. Stick two pieces of label on the specific

positions, then insert a DP out Cap into the DP out

connector.

(No.1~4 screw size=M4x10; Torque=9±0.5kgfxcm)

S17

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.

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

4. Disassembly and Assembly Procedures

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