Dell P2421B Manual

1
D
ELL
P2421
B
1. Disassembly Procedures
S1
Turn off the monitor.
S2
Place the monitor on a soft cloth or
cushion.
Press and hold the stand release
button.
Lift the stand up and away from the
monitor.
S3 Unlock 4 screws on Rear Cover
( crew Torque: 8.5±1.0kgf)
S4
Disassemble Rear Cover from the
monitor
Notice the disassembly order:
1) Disassemble the Top part
2) Disassemble the Left / Right part
3) Disassemble the Bottom part
4) Remove RC from Mid-Frame
S5
Tear off the small aluminum foil from
Main HD
S6
Tear off the acetate adhesive tape from
Panel
Pull out CTRL BD FFC cable from I/F
BD and tear off it from Main HD
S7
Pull out U B BD cable from I/F BD and
U B BD
S8
Unlock 5 BZL TRIM screws
( crew Torque: 2.0±0.5kgf)
1
3
2
2

2
D
ELL
P2421
B
S9
Disassemble BZL TRIM from
Mid-Frame
S10
Tear off CTRL BD Mylar from CTRL BD
S11 Unlock 3 CTRL BD screws
( crew Torque: 1.2±0.5kgf)
S12
Disassemble CTRL BD, O D Button
and PWR Button
S13
Tear off 2 large acetate adhesive tapes
from the Panel
S14
Unlock 9 MF screws
( crew Torque: 4.0±0.5kgf)
S15
Pull out LED Backlight wire from P
BD and Panel
S16
Tear off aluminum foil and tape from
LVD cable
Pull out the LVD cable from Panel.
S17
Disassemble Mid-Frame from Panel

3
D
ELL
P2421
B
S18
Unlock U B BD screw and disassemble
U B BD from Mid-Frame
( crew Torque: 4.5±0.5kgf)
S19
Remove afety Mylar from P BD
S20
Unlock 6 PCBA screws from PCBA
( crew Torque: 6.5±1.0kgf)
S21
Unlock 4 hexagonal screws from Main
HD
( crew Torque: 5.0±0.6kgf)
S22
Disassemble I/F BD from Main HD and
unplug P BD wire
S23
Unplug FFC LVD cable from I/F BD
S24
Disassemble P BD from Main HD

4
D
ELL
P2421
B
S13
Remove electrolyte capacitors (red mark) from printed circuit boards
13-1 Cut the glue between bulk cap. and PCB with a knife
13-2 Ensure cutting path within the glue, don’t touch bulk cap. or PCB

5
D
ELL
P2421
B
13-3 Take out bulk cap. pin solder with soldering iron and absorber
13-4 Lift the bulk cap. up and away from the PCB

6
D
ELL
P2421
B
2. Product material information
The following substances, preparations, or components should be disposed of or
recovered separately from other WEEE in compliance with Article 4 of EU Council
Directive 75/442/EEC.
Capacitors / condensers (containing
PCB/PCT)
No used
Mercury containing components
No used
Batteries No used
Printed circuit boards (with a surface greater
than 10 square cm)
Product has printed circuit boards
(with a surface greater than 10 square
cm)
Component contain toner, ink and liquids No used
Plastic containing BFR
No used
Component and waste contain asbestos
No used
CRT No used
Component contain CFC, HCFC, HFC and
HC
No used
Gas discharge lamps
No used
LCD display > 100 cm2 Product has an LCD greater than 100
cm2
External electric cable Product has external cables
Component contain refractory ceramic fibers
No used
Component contain radio
-
active substances
No used
Electrolyte capacitors (height
> 25mm, diameter > 25mm)
Product has electrolyte capacitors
(height >25mm, diameter > 25mm)
3. Tools Required
List the type and size of the tools that would typically can be used to disassemble the
product to a point where components and materials requiring selective treatment can be
removed.
Tool Description:
- Screwdriver
- Scraper Bar
- Penknife
- Soldering iron and absorber