Dell Latitude L400 User Manual Page 1

www.dell.com support.dell.comDell™ Latitude™ L400SERVICE MANUAL

4 Dell Latitude L400 Service ManualWhen you are removing and replacing components, photocopy the Table 1 placement mat as a tool to lay out and keep t

suppport.dell.com Dell Latitude L400 Service Manual 5ZIF ConnectorsSome of the computer’s interface connectors are zero insertion force (ZIF) connect

6 Dell Latitude L400 Service ManualRemoving Field-Replaceable Parts and Assemblies Figure 5. Exploded View—Computerdisplay assemblykeyboardpalmre

suppport.dell.com Dell Latitude L400 Service Manual 7The following subsections provide instructions for removing and replacing field-replaceable part

8 Dell Latitude L400 Service ManualKeyboard BezelFigure 7. Keyboard Bezel RemovalNOTICE: To avoid damaging the system board, you must remove the main

suppport.dell.com Dell Latitude L400 Service Manual 9Display Assembly Figure 8. Display Assembly RemovalNOTICE: To avoid damaging the system board,

10 Dell Latitude L400 Service Manual6. Turn the computer right-side up.7. Open the display.8. Remove the left and right hinge covers.NOTE: When replac

suppport.dell.com Dell Latitude L400 Service Manual 117. Reinstall the two M2 x 4-mm screws in the back of the computer that secure the display assem

12 Dell Latitude L400 Service ManualNOTICE: To avoid damaging the system board, you must remove the main battery before you service the computer.1. Us

suppport.dell.com Dell Latitude L400 Service Manual 13To replace the display-assembly latch, perform the following steps:1. Carefully place the latch

14 Dell Latitude L400 Service Manual2. Remove the keyboard bezel.3. Remove the display assembly.4. Remove the display assembly bezel.5. Remove the fou

suppport.dell.com Dell Latitude L400 Service Manual 15b. Lower the bottom end of the LCD panel into the top cover, making sure the LCD flex cable lin

16 Dell Latitude L400 Service ManualKeyboard Assembly Figure 12. Keyboard Assembly RemovalTo remove the keyboard assembly, perform the following step

suppport.dell.com Dell Latitude L400 Service Manual 17NOTICE: The keycaps on the keyboard are fragile, easily dislodged, and time-consuming to replac

18 Dell Latitude L400 Service ManualMemory ModuleFigure 13. Memory Module Removal NOTICE: To avoid damaging the system board, you must remove the mai

suppport.dell.com Dell Latitude L400 Service Manual 193. Pivot the memory module down until it clicks into place. If you do not hear a click as each

20 Dell Latitude L400 Service Manual7. Remove the four black M2 x 4-mm screws across the top of the computer (see Figure 15). Figure 15. Removing th

suppport.dell.com Dell Latitude L400 Service Manual 21To replace the palmrest assembly, perform the following steps:1. Place the palmrest assembly on

22 Dell Latitude L400 Service Manual2. Remove the display assembly.3. Remove the keyboard assembly.4. Remove the palmrest assembly.5. Remove the three

suppport.dell.com Dell Latitude L400 Service Manual 23Reserve Battery Figure 18. Reserve Battery RemovalNOTICE: The reserve battery provides powe

www.dell.comDell™ Latitude™ L400 SERVICE MANUAL

24 Dell Latitude L400 Service ManualModemFigure 19. Modem Removal1. Remove the keyboard bezel.2. Remove the display assembly.3. Remove the keyboard a

suppport.dell.com Dell Latitude L400 Service Manual 25To replace the modem, perform the following steps:1. Connect the modem cable to the connector o

26 Dell Latitude L400 Service Manual4. Remove the palmrest assembly.5. Carefully disconnect the fan wire connector from the system board (see Fi

suppport.dell.com Dell Latitude L400 Service Manual 27SpeakerFigure 21. Speaker Removal 1. Remove the keyboard bezel.2. Remove the display assembly.

28 Dell Latitude L400 Service ManualNOTICE: The audio EMI shield is attached to the USB connector housing with two-sided tape. To avoid bending the

suppport.dell.com Dell Latitude L400 Service Manual 297. Reinstall the palmrest assembly.8. Reinstall the keyboard assembly.9. Reinstall the display

30 Dell Latitude L400 Service ManualNOTICE: To avoid damaging the system board, you must remove the main battery before you service the computer.NOTIC

suppport.dell.com Dell Latitude L400 Service Manual 3113. Remove the modem retainer bracket from the bottom case assembly.14. Disconnect the speaker

32 Dell Latitude L400 Service ManualOne of the M2 x 3.5-mm screws passes through the hard-disk drive EMI clip (see Figure 23).9. Reinstall the audio E

suppport.dell.com Dell Latitude L400 Service Manual 331. Remove the keyboard bezel.2. Remove the display assembly.3. Remove the keyboard.4. Remove th

Notes, Notices, and CautionsThroughout this guide, blocks of text may be accompanied by an icon and printed in bold type or in italic type. These bloc

34 Dell Latitude L400 Service ManualTo replace the APR docking doors, perform the following steps.NOTE: On the under side of the doors, a small F is p

Index 1IndexAAPR docking doors removal, 33Bbottom assemblycomponents, 22illustrated, 22Ddisplay assemblybezel removal, 11hinge removal, 15latch remova

2 Dell Latitude L400 Service ManualRreserve battery removal, 23Sscrew identification and tightening, 3speaker removal, 27system board assemblyremoval,

Printed in the U.S.A.067CUJ A00P/N 67CUJ Rev. A00

vContentsRecommended Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Preparing to Work Inside Your Compu

viFigure 6. Hard-Disk Drive Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . 7Figure 7. Keyboard Bezel Removal . . . . . . . . . . . .

support.dell.com Dell Latitude L400 Service Manual 1Dell™ Latitude™ L400 Service ManualThis manual provides instructions for removing and replacing f

2 Dell Latitude L400 Service ManualRecommended ToolsMost of the procedures in this manual require the use of one or more of the following tools:• #0 a

suppport.dell.com Dell Latitude L400 Service Manual 3Figure 2. Main Battery Assembly Removal9. Ground yourself by touching the unpainted metal surfa