Dell OptiPlex 5055 Small Form Factor Owner's Manual

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Removing the system board

Follow the procedure in Before working inside your computer .
Remove the:
Disconnect the following cables from the system board:
1. speaker [1]
2. 2.5–inch drive [2]
3. optical drive [3]
4. data cable [4]
Disconnect the following cables and screw from the system board:
1. PSU [1]
2. hard drive and optical drive caddy stand off screw [2]
3. PSU [3]
4. power switch [4]
5. intrusion switch [5]
To remove the I/O panel plate:
1. Remove the 6 screw that secures the I/O panel [1].
2. Slide and push toward the front from the computer [2].
To remove the system board:
1. Remove the 12 screws that secure the system board to the computer
2. Slide and lift the system board away from the computer [2].