dell latitude ls portable computers User Manual

							www.dell.com
™
Dell™ Latitude™ LS Portable Computers 
SERVICE MANUAL 
						

							www.dell.com
™
Dell™ Latitude™ LS Portable Computers 
SERVICE MANUAL 
						

							____________________
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 
						

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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 
						

							vi
FiguresFigure 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
TableTable 1. Screw Placement Mat with Component Screw Counts and 
Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 
						

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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 indicates either potential damage to hardware or 
loss of data and tells you how to avoid the problem.
CAUTION: A CAUTION indicates a potentially hazardous situation 
which, if not avoided, may result in minor or moderate injury. 
						

							support.dell.comDell Latitude LS Portable Computers Ser vice Manual  1
Dell™ Latitude™ LS Portable 
Computers Service Manual
This manual provides instructions for removing and replacing field-replaceable 
components, assemblies, and subassemblies in your Dell Latitude portable 
computer. Unless other wise 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 other wise 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 other wise specified.
Figure 1.  Computer Orientation
right side
 left side back of computer
 front of computer 
						

							2 Dell Latitude LS Portable Computers 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
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 scratch-
ing 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).