Dell 5420, 7420 9

Removing the Base Cover | 27

9Removing the Base Cover

WARNING: Before working inside your computer, read the safety information

that shipped with your computer and follow the steps in "Before You Begin" on

page 9. For additional safety best practices information, see the Regulatory

Compliance Homepage at dell.com/regulatory_compliance.

Prerequisites

Remove the battery. See "Removing the Battery" on page 17.

Procedure

1Loosen the captive screw that secures the base cover to the computer base.

2Using your fingertips, pry the base cover from the computer base.

3Lift the base cover off the computer base.

1 captive screw 2 base cover

3tabs

book.book Page 27 Wednesday, April 11, 2012 4:13 PM

Contents

Main Notes, Cautions, and Warnings ____________________ Contents 11 Removing the Memory Module(s). . . . . . . . . . 30 12 Replacing the Memory Module(s) . . . . . . . . . . 32 13 Removing the Hard Drive . . . . . . . . . . . . . . . . 34 14 Replacing the Hard Drive . . . . . . . . . . . . . . . . 38 15 Removing the Optical Drive . . . . . . . . . . . . . 40 21 Removing the Power-Adapter Port . . . . . . . . 54 22 Replacing the Power-Adapter Port . . . . . . . . 56 23 Removing the Coin-Cell Battery. . . . . . . . . . . 58 24 Replacing the Coin-Cell Battery. . . . . . . . . . . 60 25 Removing the Fan . . . . . . . . . . . . . . . . . . . . . . 62 31 Removing the Display Bezel . . . . . . . . . . . . . . 76 32 Replacing the Display Bezel . . . . . . . . . . . . . . 78 33 Removing the Display Panel . . . . . . . . . . . . . 80 34 Replacing the Display Panel . . . . . . . . . . . . . . 82 35 Removing the Display Hinges . . . . . . . . . . . . . 84 41 Removing the System Board . . . . . . . . . . . . . . 98 42 Replacing the System Board . . . . . . . . . . . . . 102 45 Flashing the BIOS . . . . . . . . . . . . . . . . . . . . . . 108 43 Removing the Processor Heat-Sink . . . . . . . 104 44 Replacing the Processor Heat-Sink . . . . . . . 106 Page 1 Turn Off Your Computer and Connected Devices Safety Instructions 10 Recommended Tools 2 Page 3 Page 4 Page 5 Page 6 Page 7 22 Page Page 8 Page 9 Page 10 Page 11 Page 12 34 13 36 Page Page 14 Page 15 42 16 Page 17 46 Page Page 18 Page 19 52 20 Page 21 Page 22 Page 23 60 24 Page 25 Page 26 Page 27 Page 28 Page 29 Page Page Page 30 Page 31 Page 32 Page 33 82 34 Page 35 86 36 Page 37 Page Page Page 38 Page 39 96 40 Page 41 100 Page Page 42 Page 43 106 44 Page 45