Dell Latitude E5420M (Early 2011) - Manual (Page 114)

12. Replace the wireless local area network (WLAN) .
13. Replace the wireless wide area network (WWAN) .
14. Replace the hard drive.
15. Replace the optical drive.
16. Replace the keyboard .
17. Replace the keyboard trim .
18. Replace the memory.
19. Replace the back panel.
20. Replace the secure digital (SD) card .
21. Replace the subscriber identity module (SIM) card .
22. Replace the battery.
23. Follow the procedures in After Working Inside Your Computer .
Related Links
Removing the Input/Output (I/O) Panel
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