Dell Latitude E5520M (Early 2011) - Manual (Page 65)

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System Board
Removing the System Board
1. Follow the procedures in Before Working On Your Computer .
2. Remove the battery .
3. Remove the subscriber identity module (SIM) card
4. Remove the secure digital (SD) card
5. Remove the back panel .
6. Remove the memory
7. Remove the keyboard trim .
8. Remove the keyboard .
9. Remove the optical drive
10. Remove the hard drive .
11. Remove the wireless local area network (WLAN)
12. Remove the wireless wide area network (WWAN)
13. Remove the CPU door .
14. Remove the heat sink .
15. Remove the processor .
16. Remove the palm rest .
17. Remove the ExpressCard/Smart Card/PCMCIA module .
18. Remove the display assembly .
19. Remove the audio board .
20. Remove the Bluetooth .
21. Remove the modem .
22. Remove the support brackets .
23. Disconnect the coin-cell battery cable from the system board.
24. Disconnect the thermal fan cable.
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