Dell Vostro 3555 (Mid 2011) - Manual (Page 85)

System Board
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Removing The System Board
1. Follow the procedures in Before Working On Your Computer
2. Remove the battery .
3. Remove the memory card .
4. Remove the ExpressCard .
5. Remove the access panel .
6. Remove the memory module .
7. Remove the optical drive .
8. Remove the hard drive .
9. Remove the keyboard .
10. Remove the palm rest .
11. Remove the WLAN card .
12. Remove the hold switch .
13. Remove the ExpressCard board .
14. Remove the display assembly .
15. Disconnect the speaker cable.
16. Remove the screws that secure the system board to the chassis.
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