Dell UltraSharp U2421HE Bedienungsanleitung
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
S2
4.1 Disassembly Procedures:
S1
S3
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)
S2
23
41
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.
1
2
3
Necessary repair and test equipment:
1. Philips-head screwdriver
S6
S5
S7
S4
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)
1
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
S9
S8
U
.
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)
1
2
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)
1
2
3
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)
35
24
1
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)
23
4
1
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
21
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)
2
1
4
4
5
6
7
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.
S2
S1
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)
S4
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)
1
S3
21
S5
7
6
5
2
3
4
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
S8
S9
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)
23
4
1
S10
S7
1
2
3
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.
S6
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
2
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)
1
35
24
1
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
1
Stick 1pcs aluminum foil on the specific position to fix
the function key cable as the picture below shown.
23
41
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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