Dell S2421H Instructions for use

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

3. Wiring Connectivity Diagram

Panle 1920*1080

Power Board

HDMI HDMI Line Out

FK BD

KB1 speaker

Interface 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 the stand down to access to the release latch.

3. Use a long screwdriver to press the release latch.

While pressing the release latch, slide out the

stand assembly from the monitor.

Use one hand to press the rear cover, then wedge

your fingers between the rear cover and the middle

bezel on the corners of the top left side to the right

side of the monitor to release the rear cover.

To remove the VESA cover: Press the dimple on the

VESA cover to release it from the back of the display.

Use a Philips-head screwdriver to remove 6pcs

screws for unlocking mechanisms.

(No.1~4 screw size=M4x11; Torque=7 8kgfxcm;

No.5~6 screw size=M4x8; Torque=7 8kgfxcm)

Tear off 2pcs acetate tapes and then disconnect the

speaker cable away from the connector. Use a

Philips-head screwdriver to remove 6pcs screws for

unlocking the speakers with middle bezel.

(No.1~6 screw size=M3x8, Torque=5~6kgfxcm)

Tear off 1pcs aluminum foil and then remove the two

speakers. Disconnect the panel lamp cable away

from the connector of the panel module.

Necessary repair and test equipment:

1. Philips-head screwdriver

4. Disassembly and Assembly Procedures

Tear off 1pcs aluminium foil, and then disconnect the

function key cable away from the connector.

Take away the middle bezel. U

tear off the tapes for releasing the key cables.

se a Philips-head

screwdriver to remove 3pcs screws for unlocking the

function key board with the middle bezel, and then

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

S10

Tear off the tape, then lift up the panel module with

the bracket chassis for releasing the front bezel

away from the panel module.

Use a Philips-head screwdriver to remove 2pcs

screws for unlocking the bracket with middle bezel,

to remove 2pcs screws for unlocking the bracket

with the panel module.

(No.1~2 screw size=M3x4, Torque=3~4kgfxcm;

No.3~4 screw size=M3x3.5, Torque=2~3kgfxcm )

Use a Philips-head screwdriver to remove 16pcs

screws for unlocking the middle bezel.

(No.1~11 screw size=M3x4, Torque=3~4kgfxcm;

No.12~16 screw size=M2x3.3, Torque=1±0.2kgfxcm)

S11

Take away the bracket chassis module and then put

the bracket chassis module on a protective cushion.

S13

Unplug the LVDS cable from the connector of the

panel module by pushing the earing-locks.

S12

4. Disassembly and Assembly Procedures

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 six screws

for unlocking the circuit board, release all the cables

from the hooks.

(No.1~5 screw size=M3x7.5, Torque=6±0.5kgfxcm;

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

S15

S16

Remove the Mylar from the hooks of the bracket

chassis module.

S14

4. Disassembly and Assembly Procedures

Take a mylar to insert the hooks of the bracket to

cover the power board.

Panel preparation: Take out 1pcs panel module from

the carton, then remove the protective film by tearing

off the tapes, and then examine the panel surface

according to inspection criteria. Turn over the panel,

and then place screen faced down for later

assembling.

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.

Place a bracket chassis base on a protective

cushion.

4.2 Assembly Procedures:

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 six screws for locking the

power board and interface board.

(No.1~5 screw size=M3x7.5, Torque=6±0.5kgfxcm;

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

Move the bracket chassis close to the panel, then

connect LVDS cable to the connector of the panel

module. Turn over the bracket and put it on the back

of panel module.

4. Disassembly and Assembly Procedures

Use a Philips-head screwdriver to tighten 2pcs

screws for locking the bracket with middle bezel, to

tighten 2pcs screws for locking the bracket with panel.

(No.1~2 screw size=M3x4, Torque=3~4kgfxcm;

No.3~4 screw size=M3x3.5, Torque=2~3kgfxcm )

Connect the panel lamp cable to the connector of

panel module.

Take a function key board and a middle bezel, then

fix the middle bezel with a fixture, and locate the

function keyboard into the hooks of the bezel Use 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

S13

Move the middle bezel with function key board close

to the panel unit, tear off the papers of the tapes on

the back of the key cable, and then fix the key cable

on the bezel by 3pcs tapes, then assemble the

middle bezel with the front bezel and panel module.

S14

Connect the function key cable to the connector of

board, then paste 1pcs aluminum foil to cover the

LVDS connector and key cable.

S11

S12

S10

Paste 1pcs tape to cover the LVDS connector. Take

1pcs front bezel, then lift up the panel with bracket

and assemble the front bezel with the panel module.

Use a Philips-head screwdriver to lock 11pcs screws

for locking the middle bezel with the panel module,

then lock 5pcs screws for locking the middle bezel

with front bezel.

(No.1~11 screw size=M3x4, Torque=3~4kgfxcm;

No.12~16 screw size=M2x3.3, Torque=1±0.2kgfxcm)

4. Disassembly and Assembly Procedures

Use a Philips-head screwdriver to tighten 4pcs

screws for locking rear cover with the assembled

unit, to tighten 2pcs screws for locking the rear

cover with bracket chassis module.

(No.1~4 screw size=M4x11; Torque=7 8kgfxcm;

No.5~6 screw size=M4x8; Torque=7 8kgfxcm)

Take 1pcs rear cover, put down the rear cover

and push the rear cover on the positions marked

as the picture below shown for mechanisms

engagement.

S17

Take a pair of speakers to locate the probers of the

middle bezel, then connect the speaker cable to the

connector of the board. Paste 1pcs aluminum foil to

fix the bracket on the specific position.

S15

S18

Use a Philips-head screwdriver to tighten 6pcs

screws for locking the speakers with middle bezel.

Settle the cable and then fix the speaker’s cables

with 2pcs acetate tapes on the specific position as

the picture below shown.

(No.1~6 screw size=M3x8, Torque=5~6kgfxcm)

S16

front bezel with panel module , then provide power

supply and a video signal to the monitor, then turn

on the monitor for functionality check.

ift up the monitor to checking the gap between the

S20

Stick 2pcs labels on the specific positions as the

picture below shown. Take 1pcs stand riser and

1pcs stand base, assemble the stand base with

stand riser, then rotate the screw clockwise to lock

the stand base and stand riser. Insert the stand-riser

into monitor groove until it snaps into its place.

S19

5. Trouble Shooting Instructions

Self-test

Your monitor provides a self-test feature that allows you to check whether your

monitor is functioning properly. If your monitor and computer are properly connected

but the monitor screen remains dark, run the monitor self-test by performing the

following steps:

1. Turn o both your computer and the monitor.

2. Unplug the video cable from the back of the computer. To ensure proper Self-Test

operation, remove all video cables from the back of computer.

3. Turn on the monitor.

The floating dialog box should appear on-screen (against a black background), if the

monitor cannot sense a video signal and is working correctly. While in self-test mode,

the power LED remains white. Also, depending upon the selected input, one of the

dialogs shown below will continuously scroll through the screen.

The display will go into Standby mode in 4 minutes.

www.dell.com/S2421H

www.dell.com/S2721H

Dell 24/27 Monitor

S2421H/S2721H

No HDMI1 Cable

The display will go into Standby mode in 4 minutes.

www.dell.com/S2421H

www.dell.com/S2721H

Dell 24/27 Monitor

S2421H/S2721H

No HDMI2 Cable

4. This box also appears during normal system operation if the video cable is

disconnected or damaged.

5. Turn o your monitor and reconnect the video cable; then turn on both your

computer and the monitor.

If your monitor screen remains blank after you use the previous procedure, check your

video controller and computer, because your monitor is functioning properly.

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