Dell P2421DC Simplified Service Manual page 9

stick the mylar by hand and Use a Philips-head screwdriver to lock 9 screws for locking the main board and the adapter
S5
board
S6
Connect all the cable on the rear cover and put it on a protective cushion. Use a Philips-head screwdriver to lock 10 screws
for locking the middle plastic bezel with the whole unit,.
S7
Assemble the rear cover. Use a Philips-head screwdriver to lock four screws on the rear cover
(No.1~20 screw size=M3x4, Torque=3± 0.5kgfxcm)
9