Dell D2421DS User manual

Service
Service
Service
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
24" LCD Color Monitor Dell D2421DS
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE
CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.

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DELLD2421DS
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Mechanical Instruction
1 Disassembly Procedures:
Turn off power
Unplug external cables from product
Remove stand from product: use a
screwdriver to remove six screws
out
(No.1~4 screw size=M4x12; Torque=7.5~8.5kgfxcm
No.5~6 screw size=M3x6; Torque=5~6kgfxcm.)
Wedge 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.
S1
S2
S3
S4
S5

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DELLD2421DS
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Tear off 4 pieces of aluminum foil (pic.7.1)
then disconnect the keypad cable from the
connectors of the main board(pic.7.2). Tearoff
2 pieces tape, disconnect the backlight cable
from the connectors of the power board and
panel module(pic.7.3).
Pic.7.1
Pic.7.2
Lift up the bracket chassis module and put it
on a protector cushion. Please payattention
to ESD protection(wear ESD ring and so on).
Turn over the bracket chassis. Use a screwdriver
to remove 8 screws(bottom side*4,inside*4)
(Pic.9.1&2), Tear off the black tape(Pic.9.3)
(No.1~8 screw size=M3x6; Torque=4.5~6.5 kgfxcm
Pic.9.1
Pic.7.3
Disconnect the LVDS cable from the connectors of
the main board andpanel module Pic.9.2
Pic.9.3
S6
S8
S9
S7

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DELLD2421DS
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Take off the mylar
Use a screwdriver to remove last 2 screws for
unlocking the power board, then remove the
board from the hooks of the bracket chassis.
(No.1~2 screw size=M3x6, Torque=4.5~6.5kgfxcm
Use a Philips‐head screwdriver to remove 9 screws
for unlocking the bezel, then remove bezel
S10
S11
S12