Dell P2720DC Service Manual page 9

S4
Connect all of the cables of the power board and main board.stick the mylar by hand and Use a Philips-head screwdriver
to lock 9 screws for assembling he main board and the adapter board
S5
Connect all the cables and stick all the tapes on the rear cover and put it on a protective cushion. Use a Philips-head
screwdriver to lock 10 screws for assembling the middle plastic bezel with the whole unit,.
Torque=3± 0.5kgfxcm)
9
(No.1~20 screw size=M3x4,