Page 3 - Contents; Index
v Contents Recommended Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Preparing to Work Inside Your Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Screw Identification and Tightening . . . . . . . . . . . . . . . . . . . . . . . . ....
Page 4 - Tables
vi Figure 6. Hard-Disk Drive Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 7. Keyboard Bezel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 8. Display Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 9. ...
Page 5 - Figure 1. Computer Orientation
support.dell.com Dell Latitude L400 Service Manual 1 Dell™ Latitude™ L400 Service Manual This manual provides instructions for removing and replacing field-replaceable components, assemblies, and subassemblies in your Dell Latitude computer. Unless other wise noted, each procedure in this manual ass...
Page 6 - Recommended Tools; NOTICE: Make sure that the work surface is clean to prevent scratch-
2 Dell Latitude L400 Service Manual Recommended Tools Most of the procedures in this manual require the use of one or more of the following tools: • #0 and #1 magnetized Phillips-head screwdrivers • Small flat-blade screwdriver • 5-mm socket wrench • Small plastic scribe • Needle-nose pliers Prepari...
Page 7 - Figure 2. Main Battery Assembly Removal; NOTICE: While you work, periodically touch the I/O panel to; Screw Identification and Tightening; Figure 3. Screw Identification; NOTICE: When reinstalling a screw, you must use a screw of the
support.dell.com Dell Latitude L400 Service Manual 3 Figure 2. Main Battery Assembly Removal 9. Ground yourself by touching the unpainted metal surface of an I/O connector on the back of the computer. NOTICE: While you work, periodically touch the I/O panel to dissipate any static electricity that m...
Page 8 - Table 1. Screw Placement Mat With Component Screw Counts
4 Dell Latitude L400 Service Manual When you are removing and replacing components, photocopy the Table 1 placement mat as a tool to lay out and keep track of the component screws. Table 1. Screw Placement Mat With Component Screw Counts and Sizes Hard-Disk Drive Assembly: M3 x 3 mm (2 each, black) ...
Page 9 - ZIF Connectors; Figure 4. Disconnecting an Interface Cable; NOTICE: The ZIF connectors are fragile. To avoid damage, do not; Grasp the interface cable and pull it out of the connector.
support.dell.com Dell Latitude L400 Service Manual 5 ZIF Connectors Some of the computer’s interface connectors are zero insertion force (ZIF) connectors. These connectors are not removable, but they must be released to disconnect a cable from them (see Figure 4). Figure 4. Disconnecting an Interfac...
Page 10 - Figure 5. Exploded View—Computer
6 Dell Latitude L400 Service Manual Removing Field-Replaceable Parts and Assemblies Figure 5. Exploded View—Computer display assembly keyboard palmrest assembly system board assembly hard-disk drive main batter y bottom case assembly right hinge cover left hinge cover audio EMI shield audio I/O port...
Page 11 - Hard-Disk Drive Assembly; Figure 6. Hard-Disk Drive Assembly Removal
support.dell.com Dell Latitude L400 Service Manual 7 The following subsections provide instructions for removing and replacing field-replaceable parts and assemblies. Hard-Disk Drive Assembly Figure 6. Hard-Disk Drive Assembly Removal NOTICE: To avoid damaging the system board, you must remove the m...
Page 12 - Keyboard Bezel; Figure 7. Keyboard Bezel Removal; NOTICE: To avoid damaging the system board, you must remove the
8 Dell Latitude L400 Service Manual Keyboard Bezel Figure 7. Keyboard Bezel Removal NOTICE: To avoid damaging the system board, you must remove the main battery before you service the computer. NOTICE: To avoid damaging the microphone, do not put any objects into the microphone hole (see Figure 7). ...
Page 13 - Display Assembly; Figure 8. Display Assembly Removal; Remove the keyboard bezel.
support.dell.com Dell Latitude L400 Service Manual 9 Display Assembly Figure 8. Display Assembly Removal NOTICE: To avoid damaging the system board, you must remove the battery before you service the computer. 1. Remove the keyboard bezel. 2. Close the display. 3. Remove the two silver M2 x 4-mm scr...
Page 14 - Remove the left and right hinge covers.
10 Dell Latitude L400 Service Manual 6. Turn the computer right-side up. 7. Open the display. 8. Remove the left and right hinge covers. NOTE: When replacing the display assembly, the left hinge cover must go over the left hinge and the right hinge cover must go over the right hinge. They are not in...
Page 15 - Display Assembly Bezel; Figure 9. Display Assembly Bezel Removal
support.dell.com Dell Latitude L400 Service Manual 11 7. Reinstall the two M2 x 4-mm screws in the back of the computer that secure the display assembly to the back of the bottom case. 8. Tighten the two screws that you installed in step 6. 9. Open the display and reinstall the left and right hinge ...
Page 16 - Remove the six M2 x 3.5-mm screws located at the top and bottom of the; Display Assembly Latch; Figure 10. Display Assembly Latch Removal; Remove the display assembly bezel.
12 Dell Latitude L400 Service Manual NOTICE: To avoid damaging the system board, you must remove the main battery before you service the computer. 1. Use a scribe to carefully pry the six rubber screw covers out of the six screw holes located along the top and bottom of the bezel on the front of the...
Page 17 - latch in place in the display assembly top cover.; LCD Panel; Figure 11. LCD Panel Removal
support.dell.com Dell Latitude L400 Service Manual 13 To replace the display-assembly latch, perform the following steps: 1. Carefully place the latch spring over the post on the display-assembly top cover. You may need to use a small flat-blade screwdriver to place the spring over the post. Hold th...
Page 18 - NOTE: Keep the tape for when you replace the LCD panel.
14 Dell Latitude L400 Service Manual 2. Remove the keyboard bezel. 3. Remove the display assembly. 4. Remove the display assembly bezel. 5. Remove the four M2 x 3.5-mm screws on the left and right sides of the display assembly that secure the LCD panel to the top cover (see Figure 11). 6. Remove the...
Page 19 - not; Display Assembly Hinges
support.dell.com Dell Latitude L400 Service Manual 15 b. Lower the bottom end of the LCD panel into the top cover, making sure the LCD flex cable lines up with the opening that is to the right of the left hinge. c. Make sure the narrow part of the flex cable that goes to the inverter is visible at t...
Page 20 - Keyboard Assembly; Figure 12. Keyboard Assembly Removal; NOTICE: To avoid damaging the system board, you must remove
16 Dell Latitude L400 Service Manual Keyboard Assembly Figure 12. Keyboard Assembly Removal To remove the keyboard assembly, perform the following steps. NOTICE: To avoid damaging the system board, you must remove the main battery before you service the computer. NOTICE: Make sure that the work surf...
Page 21 - NOTICE: The keycaps on the keyboard are fragile, easily dislodged,; To replace the keyboard assembly, perform the following steps.; NOTICE: Position the keyboard cable so it is not twisted when it is; Connect the keyboard cable to the connector on the system board.
support.dell.com Dell Latitude L400 Service Manual 17 NOTICE: The keycaps on the keyboard are fragile, easily dislodged, and time-consuming to replace. Be careful when removing and handling the keyboard. 6. Remove the keyboard assembly. To replace the keyboard assembly, perform the following steps. ...
Page 22 - Memory Module; Figure 13. Memory Module Removal
18 Dell Latitude L400 Service Manual Memory Module Figure 13. Memory Module Removal NOTICE: To avoid damaging the system board, you must remove the main battery before you service the computer. 1. Remove the keyboard bezel. 2. Remove the keyboard assembly. 3. Ground yourself by touching the unpainte...
Page 23 - Pivot the memory module down until it clicks into place.; Palmrest Assembly; Figure 14. Removing the Palmrest Assembly Bottom Screws; NOTICE: Make sure that the work surface is clean to prevent
support.dell.com Dell Latitude L400 Service Manual 19 3. Pivot the memory module down until it clicks into place. If you do not hear a click as each end of the memory module snaps into the tabs, remove the memory module and reinstall it (see Figure 13). Palmrest Assembly Figure 14. Removing the Palm...
Page 24 - Figure 15. Removing the Palmrest Assembly Top Screws
20 Dell Latitude L400 Service Manual 7. Remove the four black M2 x 4-mm screws across the top of the computer (see Figure 15). Figure 15. Removing the Palmrest Assembly Top Screws 8. Remove the three silver M2 x 6-mm screws in the keyboard-assembly area that secure the middle of the palmrest assembl...
Page 25 - To replace the palmrest assembly, perform the following steps:; Touch Pad Assembly; Figure 16. Touch Pad Removal
support.dell.com Dell Latitude L400 Service Manual 21 To replace the palmrest assembly, perform the following steps: 1. Place the palmrest assembly on the bottom assembly. 2. Reinstall the three silver M2 x 6-mm screws in the keyboard-assembly area that secure the middle of the palmrest assembly to ...
Page 26 - Bottom Assembly; Figure 17. Bottom Assembly
22 Dell Latitude L400 Service Manual 2. Remove the display assembly. 3. Remove the keyboard assembly. 4. Remove the palmrest assembly. 5. Remove the three M2 x 3.5-mm screws that secure the touch pad assembly to the palmrest assembly (see Figure 16). 6. Slide the touch pad assembly out from under th...
Page 27 - Reserve Battery; Figure 18. Reserve Battery Removal; NOTICE: The reserve battery provides power to the computer's RTC; Main Battery
support.dell.com Dell Latitude L400 Service Manual 23 Reserve Battery Figure 18. Reserve Battery Removal NOTICE: The reserve battery provides power to the computer's RTC and nonvolatile random-access memory (NVRAM) when the com- puter is turned off. Removing the battery causes the computer to lose t...
Page 28 - Modem; Figure 19. Modem Removal
24 Dell Latitude L400 Service Manual Modem Figure 19. Modem Removal 1. Remove the keyboard bezel. 2. Remove the display assembly. 3. Remove the keyboard assembly. 4. Remove the palmrest assembly. 5. Use a 5-mm socket wrench to remove the four 5-mm socket screws for the VGA and parallel ports located...
Page 29 - Fan; Figure 20. Fan Removal
support.dell.com Dell Latitude L400 Service Manual 25 To replace the modem, perform the following steps: 1. Connect the modem cable to the connector on the system board. 2. Align the connector on the bottom of the modem with the connector on the system board, and carefully press the modem onto the s...
Page 31 - Speaker; Figure 21. Speaker Removal; NOTICE: To ensure maximum cooling for the microprocessor, do not
support.dell.com Dell Latitude L400 Service Manual 27 Speaker Figure 21. Speaker Removal 1. Remove the keyboard bezel. 2. Remove the display assembly. 3. Remove the keyboard assembly. 4. Remove the palmrest assembly. NOTICE: To ensure maximum cooling for the microprocessor, do not touch the glue sid...
Page 32 - NOTICE: The audio EMI shield is attached to the USB connector
28 Dell Latitude L400 Service Manual NOTICE: The audio EMI shield is attached to the USB connector housing with two-sided tape. To avoid bending the audio EMI shield, care must be taken when separating the audio EMI shield from the USB connector housing. 6. Using a small flat-blade screwdriver, care...
Page 33 - Reinstall the palmrest assembly.; System Board Assembly; Figure 22. System Board Assembly Removal; NOTICE: If the EMI sponge located between the battery bay and the
support.dell.com Dell Latitude L400 Service Manual 29 7. Reinstall the palmrest assembly. 8. Reinstall the keyboard assembly. 9. Reinstall the display assembly. 10. Reinstall the keyboard bezel. System Board Assembly 6 Figure 22. System Board Assembly Removal To remove the system board assembly, per...
Page 36 - Main Battery Release Latch; Figure 24. Main Battery Release Latch Removal
32 Dell Latitude L400 Service Manual One of the M2 x 3.5-mm screws passes through the hard-disk drive EMI clip (see Figure 23). 9. Reinstall the audio EMI shield. a. Carefully position the audio EMI shield so the section with the two-sided tape is over the USB connector housing. b. Press the audio E...
Page 37 - NOTICE: The tabs on the release button are plastic. Care should be; APR Docking Doors; NOTICE: The doors are attached to each other by a tension spring at
support.dell.com Dell Latitude L400 Service Manual 33 1. Remove the keyboard bezel. 2. Remove the display assembly. 3. Remove the keyboard. 4. Remove the palmrest assembly. 5. Remove the system board. NOTICE: The tabs on the release button are plastic. Care should be taken when squeezing the tabs to...
Page 38 - NOTE: On the under side of the doors, a small
34 Dell Latitude L400 Service Manual To replace the APR docking doors, perform the following steps. NOTE: On the under side of the doors, a small F is printed on the front door and a small B is printed on the back door. As you hold the doors for installation, the front door is near you, the back doo...
Page 40 - reserve battery removal,
2 Dell Latitude L400 Service Manual R reserve battery removal, 23 S screw identification and tightening, 3 speaker removal, 27 system board assembly removal, 29 T tools, 2 touch pad removal, 21 Z ZIF connectors, 5
