Table 1. OptiPlex 7490 All-in-One screw list
Component Screw type Quantity Screw image
Power-button board M3x5 1
Microphones M2x2.5 4
Side I/O-board shield M3x5 2
Side-I/O board M2.5x3.5 2
Antenna modules M2x2.5 2
Display panel M3x5 12
Middle frame M3x5 16
Audio board M3x5 1
Table 2. OptiPlex 5490 All-in-One screw list
Component Screw type Quantity Screw image
Cable coverāoptional M3x9 1
System-board shield M3x5 5
Bottom cover M3x5 4
M.2 2230 solid-state drive M2x2.5 1
M.2 2280 solid-state drive M2x2.5 1
System fan M3x5 3
Wireless-card shield M2x2.5 2
Wireless card M2x2.5 1
Camera assembly M3x5 2
12 Removing and installing components