Table 1. OptiPlex 7490 All-in-One screw list (continued)
Component Screw type Quantity Screw image
Camera assembly M3x5 2
Camera door M3x5 2
Heat sink—UMA Captive screws 5
Heat sink—Discrete Captive screws 9
Power-supply unit (PSU) M3x5 2
PSU fan M3x5 2
Rear-I/O bracket M3x5 4
System board M3x5 9
Speakers M3 4+7.1xZN 9
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
Removing and installing components 11
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