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Dell U2421HE Service Manual page 5

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Use a Philips-head screwdriver to remove 5pcs
screws for unlocking the front bezel with the
S8
assembled unit.
(No.1~5 screw size=M2x2.7, Torque=3±0.5kgfxcm)
3
2
U
se a Philips-head screwdriver to remove 2pcs
screws(left and right) for unlocking the front bezel
S9
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
Tear off the mylar tape on the function key board,
then use
a Philips-head screwdriver to tighten 3pcs
S10
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
1
4
5
.
2
3
Tear off 2pcs acetate tapes for releasing the panel
S11
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
S12
screws for unlocking the bracket chassis module.
(No.1~4 Screw size= M3x0.5x3, Torque=5~6kgfxcm)
2
1
Disconnect the LVDS cable from the connector of
S13
the panel module. Lift up the bracket chassis, and
then put the bracket chassis on a protective cushion.
2
1
3
4

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