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Dell U2421HE Service Manual page 4

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Necessary repair and test equipment:
1. Philips-head screwdriver
4.1 Disassembly Procedures:
Remove the monitor stand base:
1. Place the monitor on a soft cloth or cushion.
S1
2. Press and hold the stand-release button.
3. Lift the stand up and away from the monitor.
Use a Philips-head screwdriver to remove four
S2
S2
screws for unlocking mechanisms.
(No.1~4 screw size=M4x11; Torque=11
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 one hand
S3
to press the middle bezel, the other hand to pull up
carefully the rear cover in order of arrow preference
for unlocking mechanisms of rear cover.
2
4. Disassembly and Assembly Procedures
2
3
1
4
3
1
S4
S5
1kgfxcm)
±
S6
S7
Lift the rear cover up carefully. Disconnect the USB
FFC cable from the connector of the interface board,
and then remove the rear cover.
Use a Philips-head screwdriver to remove one screw
for unlocking the USB board unit, then release the
USB board unit and put it aside.
(No.1 screw size=M3x6, Torque=4
1
Tear off 1pcs aluminium foil for unfixing the function
key cable.
Tear off 2pcs acetate tape for releasing the panel
lamp
cables.
Use a proper tool to release the
function key cable from the connector, then pull the
function key cable high for releasing the function key
cable as the picture below shown.
0.5kgfxcm)
±

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