Dell P2421D Service Manual page 12

5.1Disassembly Procedures
1.1Disassembly Procedures
Turn off power
S1
Unplug external cables from product
S2
Press the button to remove stand from product
S3
Use a Philips-head screwdriver to remove four
screws for unlocking mechanisms
S4
(No.1~4 screw size=M4x10; Torque: 12± 2kgf.cm)
.
12
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
S5
Scraper
to separate the rear cover in the below 3direction
of the arrow.
Tear out all the cable to remove the rear cover and
put it on a protective cushion. Use a Philips-head
screwdriver to remove 11 screws for unlocking
the middle plastic bezel with the whole unit, and
S6
then remove the middle plastic bezel carefully.
(No.1~20 screw size=M3x4, Torque=3± 0.5kgfxcm)