Dell Latitude CS User manual

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____________________
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.
November 1999 P/N 0708R Rev. A01

i
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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
Memory Module Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Bottom Memory Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Top Memory Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Display Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Display-Assembly Bezel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Display-Assembly Latch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
LCD Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Replacing a Sharp LCD panel with a Sharp LCD panel or Replacing a
Samsung LCD panel with a Samsung LCD panel. . . . . . . . . . . . . . . . . .15
Replacing a Sharp LCD Panel with a Samsung LCD Panel or Replacing a
Samsung LCD Panel with a Sharp LCD Panel. . . . . . . . . . . . . . . . . . . . .16
Removing the Packing Bezel on a New Sharp LCD Panel. . . . . . . . .17
Packing a Defective Sharp LCD Panel for Return Shipping. . . . . . . .17
Keyboard Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Palmrest Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Bottom Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Reserve Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Main Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Main Battery Release Latch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Thermal Cooling Solution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
System Board Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Touch Pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Fan Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
,QGH[
)LJXUHV Figure 1. Computer Orientation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Figure 2. Main Battery Assembly Removal. . . . . . . . . . . . . . . . . . . . . . . .3

ii
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. Bottom Memory Module Removal. . . . . . . . . . . . . . . . . . . . . . .8
Figure 8. Top Memory Module Removal . . . . . . . . . . . . . . . . . . . . . . . . .9
Figure 9. Status Indicator Panel Removal . . . . . . . . . . . . . . . . . . . . . . . .10
Figure 10. Display Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . .11
Figure 11. Sharp Display-Assembly Bezel Removal . . . . . . . . . . . . . . . .13
Figure 12. Samsung Display-Assembly Bezel Removal. . . . . . . . . . . . . .14
Figure 13. Removing the Keyboard-Assembly Screws. . . . . . . . . . . . . .18
Figure 14. Removing the Palmrest-Assembly Screws . . . . . . . . . . . . . .19
Figure 15. Palmrest Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . .21
Figure 16. Bottom Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Figure 17. Main Battery Release Latch. . . . . . . . . . . . . . . . . . . . . . . . . .23
Figure 18. Thermal Cooling Solution Removal. . . . . . . . . . . . . . . . . . . . .24
Figure 19. System Board Assembly Removal. . . . . . . . . . . . . . . . . . . . .26
Figure 20. Microprocessor Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
7DEOHV Table 1. Screw Placement Mat with Component Screw Counts and Sizes. . 4

iii

iv
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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 trou-
bleshooting procedures and instructions on using the Dell Diagnostics to test
the computer system.
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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.
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Dell Latitude CS Portable Computers Service Manual 1
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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 theI/O panel on the back and right side
of the computer.
A part can be replaced by performing the removal procedure in reverse
order.
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.
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right side
left side
back of computer
front of computer

2 Dell Latitude CS Portable Computers Service Manual
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Most of the procedures in thismanual 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
7-mm socket wrench
Small plastic scribe
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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 aC/Dock Expansion Station or C/Port
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.
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8. Turn the computer over so the battery is on the lower right corner of the
computer, 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 out of the battery bay (seeFigure 2).

Dell Latitude CS Portable Computers Service Manual 3
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9. Ground yourself by touching the unpainted metal surface of the I/O panel
on the back of the computer.
While you work, periodically touch the I/O panel to dissipate any static
electricity that might harm components.
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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.
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battery battery latch

4 Dell Latitude CS Portable Computers 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.
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Hard-Disk Drive
Assembly:
M2 x 4 mm (2 each)
Memory Module
Cover:
M2.6 x 3 mm (2 each)
Display Assembly
Hinge to Bottom
Case Assembly:
M2.6 x 6 mm (4 each)
Display Assembly,
including Bezel:
M2 x 4 mm (6 each
[Sharp LCD] and 8 each
[Samsung LCD])
Rubber Screw
Covers (2 each [large]
and 4 each [small])
Keyboard
Assembly:
M2 x 16 mm (2 each)
Palmrest Assembly:
M2 x 2.5 mm (2 each
[palmrest top])
M2 x 4 mm (7 each
[computer bottom])
M2 x 2.5 mm (5 each
[battery bay])
Thermal Cooling
Solution:
M2 x 13 mm (4 each)
M2 x 4 mm (3 each)
System Board
Assembly:
M2 x 4 mm (8 each)
M2.6 x 6 mm (2 each)
PC Card Cover:
M2 x 4 mm (4 each)
(part of system
board screws)
Media Bay Port:
M2 x 2.5 mm (2 each)
Touch Pad:
M2 x 2.5 mm (2 each)

Dell Latitude CS Portable Computers Service Manual 5
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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).
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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.
movable part of
connector
(do not remove)

6 Dell Latitude CS Portable Computers Service Manual
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The following subsections provide instructions for removing and replacing
field-replaceable parts and assemblies.
display
assembly
keyboard
palmrest
assembly
system board
hard-disk drive
main battery
bottom case assembly
status indicator panel
right hinge cover
left hinge cover
thermal cooling
solution
media-bay port cove
r

Dell Latitude CS Portable Computers Service Manual 7
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1. Turn the computer over, and remove the two M2 x 4-mm screws from the
bottom of the hard-disk drive door (seeFigure 6).
The drive is located on the left side of the computer when the computer is
turned over.
2. Grasp the drive door, slide it up, and pull the drive out of the computer.
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1. Close the display, and turn the computer upside down on a flat work
surface.
2. Remove the two M2.6 x 3-mm screws from the memory module cover,
and lift the cover up and out (two tabs are located on the opposite side of
the screw holes on the cover).
bottom of computer
hard-disk drive door
M2 x 4-mm screw(2)

8 Dell Latitude CS Portable Computers Service Manual
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To remove the bottom memory module, perform the following steps.
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PHPRU\PRGXOHVRFNHW
1. Remove the memory module cover.
2. Ground yourself by touching the unpainted metal surface of an I/O
connector on the computers back panel.
3. To release the memory module from its socket, carefully spread apart
the inner tabs of the memory module socket just far enough for the
memory module to disengage from the socket (it should pop up slightly)
(see Figure 7).
4. 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.
Memory modules are keyed, or designed to fit into their sockets in only
one direction. The slots on the system board are notched so that the
memory module can be firmly seated only one way.
2. With the module at a 45-degree angle, press the memory modules edge
connector firmly into the memory module socket.
3. Pivot the memory module down until it clicks into place.
4. 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.
memory
module
socket
inner tabs (2)
memory module

Dell Latitude CS Portable Computers Service Manual 9
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1. Remove the status indicator panel.
Use a flat-blade screwdriver to press in on the three tabs that secure the
status indicator panel to the back panel of the computer (see Figure 9).
2. Remove the keyboard (seeFigure 13).
3. Remove the thermal cooling solution (seeFigure 18).
4. Ground yourself by touching the unpainted metal surface of an I/O
connector on the computers back panel.
5. To release the memory module from its socket, carefully spread apart
the inner tabs of the memory module socket just far enough for the
memory module to disengage from the socket (it should pop up slightly)
(see Figure 8).
inner tabs (2
)
memory modul
e

10 Dell Latitude CS Portable Computers Service Manual
6. Lift the memory module out of its socket.
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To replace a memory module, perform the following steps.
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VRFNHWRQO\
1. Align the memory modules edge connector with the slot in the center of
the memory module socket.
Memory modules are keyed, or designed to fit into their sockets in only
one direction. The slots on the system board are notched so that the
memory module can be firmly seated only one way.
2. With the module at a 45-degree angle, press the memory modules edge
connector firmly into the memory module socket.
3. Pivot the memory module down until it clicks into place.
4. 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.
tabs (3)

Dell Latitude CS Portable Computers Service Manual 11
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1. Remove the status indicator panel.
2. Remove the right plastic hinge cover by sliding it to the right of the display
assembly.
3. Remove the two M2.6 x 6-mm hinge screws that secure the right hinge to
the bottom case (see Figure 10).
4. Remove the left plastic hinge cover by sliding it to the left of the display
assembly.
status indicator
panel
display assembly
M2.6 x 6-mm
screws (4)
left hinge cover
right hinge cove
display-assembly
interface wire
display-assembly
inverter wire