Dell P2720DC Service Manual page 8

3.2 Assembly Procedures
Use a Philips-head screwdriver to lock 1 screws for assembling the USB board and Connect the cables of the USB board
S1
(No.1 screw size=M3x6, Torque=4± 1kgf.cm)
Use a Philips-head screwdriver to lock 3 screws for assembling 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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