Dell Latitude E5420M (Early 2011) - Manual (Page 131)

21. Replace the keyboard trim and keyboard.
22. Replace the memory .
23. Replace the back panel .
24. Replace the secure digital (SD) card .
25. Replace the subscriber identity module (SIM) card .
26. Replace the battery .
27. Follow the procedures in After Working Inside Your Computer .
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Removing the Speakers
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