Dell D2721H User manual

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27"LCDColorMonitor Dell D2721H
Service
Service
Service
SAFETYNOTICE
HorizontalFrequency
30kHzto83kHz
CAUTION: USEASEPARATEISOLATIONTRANSFOMERFORTHIS UNITWHENSERVICING
ANYPERSONATTEMPTINGTOSERVICETHISCHASSISMUSTFAMILIARIZEHIMSELFWITHTHECHASSSAND
BEAWAREOFTHENECESSARYSAFETYPRECAUTIONSTOBEUSEDWHENSERVICINGELECTRONICEQUIPME
NTCONTAINING HIGH VOLTAGES.

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DELL D2721H
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Mechanical Instruction
1 Disassembly Procedures:
Turn off power
Unplug external cables from product
Use a Philips‐ head screwdriver to
remove 6 screws for unlocking
mechanisms.
(No.1~4 screw size=M4x10; Torque=7.5~8.5kgfxcm
No.5~6 screw size=M4x5; Torque=5~6kgfxcm.)
Use your finger to push the button , then
pull out the stand .
Use a Philips‐ head screwdriver to remove
1screw for unlockingmechanisms.
(Screw size=M3x6; Torque=4.5~6.5 kgfxcm)
Wedge your fingers(or plastic picks )
between the rear cover and the middle bezel
on the corners of the bottom side of the
monitor to release the rear cover, then pull
up carefully the rear cover in order of arrow
preference for unlocking mechanisms of rear
cover.
Put it on a protective cushion and remove
the rear cover.
Use a Philips‐head screwdriver to remove
17 screws for unlocking mechanisms.
(No.1~15 screw size=M3x4; Torque=4.5~6.5kgfxcm
No.16~17 screw size=M3x3; Torque=4.5~6.5kgfxcm.)
S1
S2
S3
S4
S5
S6
S7
S8

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DELL D2721H
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Tear off 2 pieces tapes and 3 pieces aluminum
foil (pic.7.1)
Disconnect the backlight cable and LVDS cable
from the connectors of panel(pic.7.2).
Take off the key board from the bezel, then
disconnect the cable from the key board
(pic.7.3).
Pic.7.1
Pic.7.2
Pic.7.3
Lift up the bracket chassis module and put it
on a protector cushion. Please pay attention
Tear off the tape (Pic.10.1).
Use a Philips‐ head/hexagon screwdriver to
remove 7 screws and 2 hexagon screw for
unlocking the main board and power board
(Pic.10.2 and 3).
Please make sure screw driver not touch with
components on board）
(No.1~5+7 screw size=M3x6; Torque=4.5~6.5 kgfxcm
No.8~9 screw size=H4.7x5 (Hexagon screw); Torque=
4~5kgfxcm
Pic.10.1
Pic.10.2
Pic.10.3
Take off the PCB from the shielding cover
to ESD protection (wear ESD ring and so on). and put in on a protector cushion.
Then disconnect cables from the main board
and the power board.
S9
S10
S11

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DELL D2721H
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Lift up the top side of the bezel, then pull
down to take off the bezel.
S13