Dell latitude ls schematic
™
Dell™ Latitude™ LS Portable Computers
SERVICE MANUAL
www.dell.com
™
Dell™ Latitude™ LS Portable Computers
SERVICE MANUAL
www.dell.com
____________________
Information in this document is subject to change without notice.
© 1999 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 Computer Corporation.
Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products.
Dell Computer Corporation disclaims any proprietary interest in trademarks and trade names other than its own.
October 1999 P/N 3538U Rev. A00
Contents
Recommended Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Preparing to Work Inside Your Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Screw Identification and Tightening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
ZIF Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Removing Field-Replaceable Parts and Assemblies . . . . . . . . . . . . . . . . . . . . 6
Hard-Disk Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Keyboard Bezel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Display Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Display Assembly Bezel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Display Assembly Latch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
LCD Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Display Assembly Hinges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Keyboard Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Memory Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Palmrest Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Touch Pad Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Bottom Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Reserve Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
RTC Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Main Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
System Board Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Main Battery Release Latch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
APR Docking Doors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Index
v
Figures
Figure 1. Computer Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. Main Battery Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . 3
Figure 3. Screw Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Figure 4. Disconnecting an Interface Cable . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 5. Exploded View—Computer. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 6. Hard-Disk Drive Assembly Removal . . . . . . . . . . . . . . . . . . . . . 7
Figure 7. Keyboard Bezel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 8. Display Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Figure 9. Display Assembly Bezel Removal . . . . . . . . . . . . . . . . . . . . . . 12
Figure 10. Display Assembly Latch Removal . . . . . . . . . . . . . . . . . . . . . . 13
Figure 11. LCD Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 12. Keyboard Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 13. Memory Module Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 14. Removing the Palmrest Assembly Bottom Screws . . . . . . . . 20
Figure 15. Removing the Palmrest Assembly Top Screws . . . . . . . . . . . 21
Figure 16. Touch Pad Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 17. Bottom Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 18. Reserve Battery Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 19. Modem Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 20. Fan Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 21. Speaker Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 22. System Board Assembly Removal . . . . . . . . . . . . . . . . . . . . . 30
Figure 23. Hard-Disk Drive EMI Clip. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 24. Main Battery Release Latch Removal . . . . . . . . . . . . . . . . . . . 33
Table
Table 1. Screw Placement Mat with Component Screw Counts and
Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
vi
vii
Read This First
A prerequisite for using this manual to service Dell computer systems is a basic
knowledge of PCs and prior training in PC troubleshooting techniques. In addition
to information provided in this manual, Dell provides the User’s Guide for
troubleshooting procedures and instructions on using the Dell Diagnostics to
test the computer system.
Notes, Notices, and Cautions
Throughout this guide, blocks of text may be accompanied by an icon and printed
in bold type or in italic type. These blocks are notes, notices, and cautions, and
they are used as follows:
NOTE: A NOTE indicates important information that helps you make better use
of your computer system.
NOTICE: A NOTICE ind icates ei ther pote ntial dam age to hardware or
loss of data and tells you how to av oid the problem.
CAUTION: A CAUTION indicates a potentially hazardous situation
which, if not avoided, may result in minor or moderate injury.
viii
Dell™ Latitude™ LS Portable
right side
left side
back of computer
front of computer
Computers Service Manual
This manual provides instructions for removing and replacing field-replaceable
components, assemblies, and subassemblies in your Dell Latitude portable
computer. Unless otherwise noted, each procedure in this manual assumes
the following conditions:
The computer and any attached peripherals are turned off, and the
•
peripherals are disconnected 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 procedures in this manual, the locations or directions relative
to the computer are as shown in Figure 1 unless otherwise specified.
Figure 1. Computer Orientation
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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
•
Preparing to Work Inside Your Computer
Before you start to work on the computer, perform the following steps:
1. Save any work in progress and close all open application programs.
2. Turn off the computer and any attached peripherals.
NOTE: Make sure that the computer is turned off and not in suspend-to-
disk mode (S2D). If you cannot shut down the computer using its operating
system, press the power button for 4 seconds.
3. If the computer is docked in the LS 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 the computer.
7. Remove any installed PC Cards.
NOTICE: Make sure that the work surface is clean to prevent scratching the computer cover.
NOTICE: To avoid damaging the system board, you must remove the
main battery before you service the computer.
8. Turn the computer over and remove the main battery assembly from the
battery bay.
Slide the battery bay latch toward the right side of the computer to push
the back side of the battery up and out of the battery bay (see Figure 2).
2 Dell Latitude LS Portable Computers Service Manual
Figure 2. Main Battery Assembly Removal
battery
battery latch
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 e l e ctricity that might harm com ponents.
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
sure that the screw is properly aligned with its corresponding hole,
and avoid overtightenin g.
support.dell.com Dell Latitude LS Portable Computers Service Manual 3
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
Display Assembly
Hard-Disk Drive
Assembly:
M2 x 4 mm (2 each)
Display Assembly
Hinge to Base:
M2 x 4 mm (4 each)
M2 x 3.5 mm (6 each)
Rubber Screw Covers
Bezel:
(4 each)
LCD Panel and
Inverter:
M2 x 3.5 mm (5 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])
VGA and Parallel
Port:
5 mm socket (4 each)
Display Assembly
Hinges:
M2.6 x 4 mm (4 each)
Touch Pad:
M2 x 3.5 mm (3 each)
IDE Connector:
IDE connector screws
(2 each)
Keyboard
Assembly:
M2 x 4 mm (4 each)
Modem Retainer
Bracket:
M2 x 8.5 mm (2 each)
Fan:
M2 x 3.5 mm (2 each)
Speaker:
M2 x 3.5 mm (2 each)
4 Dell Latitude LS Portable Computers Service Manual
Audio I/O Cover:
M2 x 4 mm (2 each)
System Board
Assembly:
M2 x 3.5 mm (6 each)
ZIF Connectors
movable part of
connector
(do not remove)
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 Interface Cable
NOTICE: The ZIF connectors are fragile. To avoid damage, do not
apply too much pressure to the movable part of the connector.
To disconnect an interface cable from a ZIF connector, perform the following
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
connector.
2. Orient the end of the interface cable with the ZIF connector, and insert the
end of the cable into the connector.
3. While holding the cable in place, close the ZIF connector.
To ensure a firm connection, make sure the ZIF connector is completely
closed.
support.dell.com Dell Latitude LS Portable Computers Service Manual 5
Removing Field-Replaceable Parts
and Assemblies
display
assembly
left hinge cover
palmrest
assembly
audio EMI
shield
audio I/O port cover
keyboard
keyboard bezel
right hinge cover
hard-disk drive
modem
system board assembly
speaker
Figure 5. Exploded View—Computer
The following subsections provide instructions for removing and replacing
field-replaceable parts and assemblies.
6 Dell Latitude LS Portable Computers Service Manual
fan
APR docking
doors
bottom case assembly
main battery
Hard-Disk Drive Assembly
bottom of computer
hard-disk drive
M2 x 4-mm screws (2)
Figure 6. Hard-Disk Drive Assembly Removal
NOTICE: To avoid damaging the system board, you mus t remo v e the
main battery before you service the computer.
NOTICE: The hard-disk drive is very se nsitive 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 M2 x 4-mm screws from the
bottom of the hard-disk drive door (see Figure 6).
The hard-disk drive is located on the right side of the computer.
2. Pull the drive out of the computer.
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