Dell P2421D Service Manual page 15

5.2 Assembly Procedures
Use a Philips-head screwdriver to lock 1 screws to assemble the USB board. Connect the cables of the USB board
(No.1 screw size=M3x6, Torque=4± 1kgf.cm)
Use a Philips-head screwdriver to lock 3 screws for locking the key board and the middle frame.
S2
(No.1~3 screw size=M2X2.5, Torque: 6± 1kgf.cm)
Use a Philips-head screwdriver to lock 3 screws for assembling the bezel and the middle frame.
(No.1~3 screw size=M2X2.5, Torque: 6± 1kgf.cm)
S3
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