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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 the spring on the post with the screwdriver while
performing the next step.

2. Holding the latch, stretch the spring slightly and set the display-assembly

latch in place in the display assembly top cover.

3. Reinstall the bezel.

LCD Panel

Figure 11. LCD Panel Removal

NOTICE: To avoid damaging the system board, you must remove the

main battery before you service the computer.

1.

Ground yourself by touching the unpainted metal surface of the I/O panel
on the back of the computer.

LCD panel

wide flex
cable

LCD flex
cable

back light
plug

M2 x 3.5-mm screws (4)

back light
plug

inverter

inverter

narrow flex
cable

ZIF
connector

M2 x 3.5-mm
screw

EMI
sponges (2)

narrow flex
cable

EMI shield

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Содержание Latitude L400

Страница 1: ...Thank you for purchasing this Factory Service Manual CD DVD from servicemanuals4u com Please check out our eBay auctions for more great deals on Factory Service Manuals servicemanuals4u ...

Страница 2: ...www dell com Dell Latitude L400 SERVICE MANUAL ...

Страница 3: ...f not avoided may result in minor or moderate injury ____________________ Information in this document is subject to change without notice 2001 Dell Computer Corporation All rights reserved Reproduction in any manner whatsoever without the written permission of Dell Computer Corporation is strictly forbidden Trademarks used in this text Dell the DELL logo and Latitude are trademarks of Dell Comput...

Страница 4: ... Latch 12 LCD Panel 13 Display Assembly Hinges 15 Keyboard Assembly 16 Memory Module 18 Palmrest Assembly 19 Touch Pad Assembly 21 Bottom Assembly 22 Reserve Battery 23 Main Battery 23 Modem 24 Fan 25 Speaker 27 System Board Assembly 29 Main Battery Release Latch 32 APR Docking Doors 33 Index Figures Figure 1 Computer Orientation 1 Figure 2 Main Battery Assembly Removal 3 Figure 3 Screw Identifica...

Страница 5: ...oval 18 Figure 14 Removing the Palmrest Assembly Bottom Screws 19 Figure 15 Removing the Palmrest Assembly Top Screws 20 Figure 16 Touch Pad Removal 21 Figure 17 Bottom Assembly 22 Figure 18 Reserve Battery Removal 23 Figure 19 Modem Removal 24 Figure 20 Fan Removal 25 Figure 21 Speaker Removal 27 Figure 22 System Board Assembly Removal 29 Figure 23 Hard Disk Drive EMI Clip 31 Figure 24 Main Batte...

Страница 6: ...connected from the I O panel on the back and right side of the computer A part can be replaced by performing the removal procedure in reverse order unless otherwise noted When the display assembly is open nearly 180 degrees use a book or something similar to support it The angle of the display assembly with respect to the bottom case should never exceed 180 degrees Also when performing the procedu...

Страница 7: ...ower button for 4 seconds 3 If the computer is docked in the L400 Advanced Port Replicator APR undock the computer 4 Disconnect the computer and any attached peripherals from their electrical outlets to reduce the potential for personal injury or shock Also disconnect any telephone or telecommunications lines from the computer 5 Remove the power cable 6 Disconnect all other external cables from th...

Страница 8: ...ents Screw Identification and Tightening The illustrations in the following removal procedures provide lengths of the correct screws for each procedure Figure 3 shows examples Match the actual screw to the illustration to check for correct length Figure 3 Screw Identification NOTICE When reinstalling a screw you must use a screw of the correct length Otherwise you could damage the hardware Make su...

Страница 9: ...M2 x 3 5 mm 6 each Rubber Screw Covers 6 each LCD Panel and Inverter M2 x 3 5 mm 5 each Display Assembly Hinges M2 6 x 4 mm 4 each Keyboard Assembly M2 x 4 mm 4 each Palmrest Assembly M2 6 x 1 6 mm 6 each battery bay M2 x 4 mm 4 each black M2 x 6 mm 3 each silver Touch Pad M2 x 3 5 mm 3 each Modem Retainer Bracket M2 x 9 5 mm 2 each VGA and Parallel Port 5 mm socket 4 each IDE Connector IDE connec...

Страница 10: ...ng steps 1 Insert a small flat blade screwdriver under the movable part of the connector 2 Pull gently upward on the movable part of the connector until it releases the interface cable 3 Grasp the interface cable and pull it out of the connector To reconnect an interface cable to a ZIF connector perform the following steps 1 Use a small flat blade screwdriver to open the movable part of the ZIF co...

Страница 11: ...mblies Figure 5 Exploded View Computer display assembly keyboard palmrest assembly system board assembly hard disk drive main battery bottom case assembly right hinge cover left hinge cover audio EMI shield audio I O port cover keyboard bezel speaker fan APR docking doors modem ...

Страница 12: ... computer NOTICE The hard disk drive is very sensitive to shock Handle the assembly by its edges do not squeeze the top of the hard disk drive case and avoid dropping it NOTICE Make sure that the work surface is clean to prevent scratching the computer cover 1 Turn the computer over and remove the two M3 x 3 mm screws from the bottom of the hard disk drive door see Figure 6 The hard disk drive is ...

Страница 13: ...er NOTICE To avoid damaging the microphone do not put any objects into the microphone hole see Figure 7 1 Place the point of a paper clip or a tool of similar size in the keyboard bezel hole and carefully push down see Figure 7 2 While pushing down slide the keyboard bezel to the left until it releases 3 Lift the keyboard bezel keyboard bezel release hole keyboard bezel microphone hole ...

Страница 14: ...the two silver M2 x 4 mm screws at the back of the computer that secure the display assembly to the bottom case see Figure 8 4 Turn the computer upside down on a flat work surface 5 Remove the two M2 x 4 5 mm screws at the bottom of the computer that secure the display assembly to the bottom case see Figure 8 LCD flex cable hold down clip M2 x 9 5 mm screw right hinge cover LCD flex cable M2 x 4 m...

Страница 15: ...llowing steps 1 Place the display assembly on the bottom assembly Insert the left and right hinge posts into the holes at the top of the palmrest 2 Carefully connect the LCD flex cable to the connector on the system board 3 Place the LCD flex cable hold down clip over the LCD flex cable connector see Figure 8 The tab at the left of the clip should go under the palm rest and the screw hole on the r...

Страница 16: ...reinstall the left and right hinge covers An L is stamped on the bottom of the left hinge cover and an R is stamped on the bottom of the right hinge cover Display Assembly Bezel l Figure 9 Display Assembly Bezel Removal LCD panel display assembly top cover inverter display assembly bezel large rubber screw covers 6 M2 x 3 5 mm screws 6 latch left hinge right hinge M2 6 x 4 mm screws 4 M2 x 3 5 mm ...

Страница 17: ...openings that snap into the display assembly top cover Carefully lift the inside edge of the bezel working your way around the inside perimeter to unsnap and remove the bezel from the display assembly Display Assembly Latch Figure 10 Display Assembly Latch Removal NOTICE To avoid damaging the system board you must remove the main battery before you service the computer 1 Remove the display assembl...

Страница 18: ...atch stretch the spring slightly and set the display assembly latch in place in the display assembly top cover 3 Reinstall the bezel LCD Panel Figure 11 LCD Panel Removal NOTICE To avoid damaging the system board you must remove the main battery before you service the computer 1 Ground yourself by touching the unpainted metal surface of the I O panel on the back of the computer LCD panel wide flex...

Страница 19: ...2 Carefully peel the LCD flex cable away from the top cover 13 Lift the LCD panel out of the top cover 14 Lift up on the tape that is covering the wide flex cable connector on the back of the LCD panel NOTE Keep the tape for when you replace the LCD panel 15 Disconnect the wide flex cable from the connector on the back of the LCD panel To replace the LCD panel perform the following steps 1 Connect...

Страница 20: ...he plug over and reinsert it into the connector 7 Roll the inverter over away from you so the connector side of the inverter is up 8 Place the inverter into the top cover aligning the posts in the top cover with the alignment holes in the inverter 9 Holding the inverter in place reinstall the M2 x 3 5 mm screw that secures the inverter to the top cover 10 Reinstall the four M2 x 3 5 mm screws in t...

Страница 21: ...ove the keyboard bezel 2 Remove the four M2 x 4 mm screws located across the top of the keyboard assembly see Figure 9 NOTE Five metal tabs retain the bottom of the keyboard in the palmrest assembly 3 Release the keyboard assembly from the palmrest assembly by lifting the top edge of the keyboard assembly up and sliding it toward the back of the computer 4 Rotate the keyboard up so it is perpendic...

Страница 22: ...rd assembly fit correctly into the slotted holes in the palmrest assembly To help align the tabs with the slotted holes you can temporarily insert the hard disk drive into the hard disk drive bay before you place the keyboard assembly in the palmrest assembly By resting the keyboard assembly on the hard disk drive the tabs will be at the correct height to enter the slotted holes When the keyboard ...

Страница 23: ...emory module socket just far enough for the memorymodule to disengage from the socket it should pop up slightly see Figure 13 5 Lift the memory module out of its socket To replace a memory module perform the following steps 1 Align the memory module s edge connector with the slot in the center of the memory module socket The memory module is keyed or designed to fit into the socket in only one dir...

Страница 24: ...bly consists of the palmrest status lights and touch pad assembly 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 display assembly 3 Remove the keyboard assembly 4 Turn the computer upside down on a flat work surface 5 Remove the six M2 6 x 1 6 mm screws located in the battery bay see Figure 14 NOTI...

Страница 25: ...mbly area that secure the middle of the palmrest assembly to the bottom case see Figure 15 9 Disconnect the status lights flex cable from the ZIF connector on the system board 10 Disconnect the touch pad flex cable from the ZIF connector on the system board 11 Carefully remove the palmrest assembly from the bottom assembly M2 x 4 mm screws 4 black palmrest assembly M2 x 6 mm screws 3 silver status...

Страница 26: ... to the ZIF connector on the system board 5 Connect the status lights flex cable to the ZIF connector on the system board 6 Turn the computer upside down 7 Reinstall the six M2 6 x 1 6 mm screws in the battery bay that secure the bottom of the palmrest assembly to the bottom case assembly see Figure 14 8 Turn the computer right side up 9 Reinstall the keyboard assembly 10 Reinstall the display ass...

Страница 27: ... Disconnect the flex cable from the ZIF connector on the back of the touch pad see Figure 16 The flex cable remains attached to the touch pad holder assembly Bottom Assembly Figure 17 Bottom Assembly The bottom assembly consists of the following field replaceable components Reserve battery Main battery Modem Fan assembly Speaker System board assembly Main battery release latch Bottom case assembly...

Страница 28: ...emove the reserve battery 1 Remove the keyboard bezel 2 Remove the keyboard assembly 3 Peel the reserve battery away from the foam pad on the system board see Figure 18 The reserve battery is located between the memory module and the PC Card bay and it is attached to the system board with an adhesive foam pad 4 Disconnect the reserve battery cable from the connector on the system board 5 Remove th...

Страница 29: ...driver to remove the two integrated drive electronics IDE connector screws at both ends of the IDE modular bay connector located on the back of the bottom assembly 7 Remove the M2 x 9 5 mm screw that secures the modem retainer bracket and modem to the system board see Figure 19 The screw is located by the VGA port 8 Remove the modem retainer bracket from the system board 9 Pull the modem straight ...

Страница 30: ...modem retainer bracket and modem to the system board 5 Reinstall the two IDE connector screws at both ends of the IDE modular bay connector located on the back of the bottom assembly 6 Reinstall the four 5 mm socket screws for the VGA and parallel ports located on the back of the bottom assembly 7 Reinstall the palmrest assembly 8 Reinstall the keyboard assembly 9 Reinstall the display assembly 10...

Страница 31: ... bottom assembly To replace the fan perform the following steps 1 Place the fan in the bottom assembly NOTE Make sure that the fan wire is pointing toward the connector on the system board assembly 2 Reinstall the M2 x 8 mm screws with double rubber washers to secure the fan to the bottom assembly NOTE Make sure that the two M2 x 8 mm screws are installed with two rub ber washers apiece 3 Reconnec...

Страница 32: ...mal conductive tape The oils in your skin reduce the heat transfer capability on the glue side of the tape 5 Peel up the EMI adhesive sponge that connects the audio EMI shield to the thermal cooling solution see Figure 21 You only need to peel up the part of the sponge that lies on the thermal cooling solution The end of the sponge that lies on the audio EMI shield can remain audio EMI shield EMI ...

Страница 33: ... speaker from the bottom assembly 10 Remove the rubber speaker gasket from the bottom assembly To replace the speaker perform the following steps 1 Reinstall the rubber speaker gasket in the bottom case The gasket is keyed so it will fit in the bottom case one way only 2 Place the speaker in the bottom case 3 The wire end of the speaker should face towards the center of the bottom assembly 4 Reins...

Страница 34: ... system board assembly perform the following steps NOTICE If the EMI sponge located between the battery bay and the USB connector becomes dislodged reinsert it PC Card cover system board fan assembly M2 x 9 5 mm screw audio I O port cover audio EMI shield fan wire connector M2 x 4 mm screws 2 thermal cooling solution M2 x 3 5 mm screws 6 modem retainer bracket modem reserve battery bottom case ass...

Страница 35: ...the EMI adhesive sponge that connects the audio EMI shield to the thermal cooling solution see Figure 22 You only need to peel up the part of the sponge that lays on the thermal cooling solution The end of the sponge that lays on the audio EMI shield can remain 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 b...

Страница 36: ... Place the system board assembly in the bottom case assembly The I O ports should protrude comfortably through the openings at the back of the bottom case assembly 4 Reconnect the fan wire to the connector on the system board assembly 5 Reconnect the speaker wire to the connector on the system board assembly 6 Replace the modem retainer bracket around the I O ports and on top of the modem 7 Reinst...

Страница 37: ...IDE connector screws at both ends of the IDE modular bay connector located on the back of the bottom case assembly 11 Reinstall the four 5 mm socket screws for the VGA and parallel ports located on the back of the bottom case assembly 12 Replace the audio I O cover 13 Replace the two M2 x 4 mm screws to secure the audio I O cover to the bottom case assembly 14 Reinstall the palmrest assembly 15 Re...

Страница 38: ...tween the door edges and the edge of the door opening on the right side There is a small slot at the right edge of the door opening to show where the screwdriver is placed 3 Gently push the screw driver against the right edge of the back door to cause the door to bow up at their center 4 Grasp the back door as it bows up while still pressing the door edge with the screwdriver 5 Carefully slip the ...

Страница 39: ...and the tension spring is to the left 1 Turn the computer upside down The APR connector door opening should be at the top 2 Holding the two doors together at their right edges insert the left hinges of the doors at the end with the tension spring onto the left front and back hinge pins 3 Carefully bow the doors in the center 4 Slip the right hinge of the back door on to the right back hinge pin 5 ...

Страница 40: ...l 9 F fan removal 25 field replaceable parts and assemblies illustrated 6 G grounding to dissipate static electricity 3 H hard disk drive assembly removal 7 hinge removal 15 K keyboard assembly removal 16 L latch removal 12 LCD panel removal 13 M main battery release latch removal 32 removal 3 23 memory module removal 18 modem removal 24 P palmrest assembly removal 19 ...

Страница 41: ...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 ...

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