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Dell Latitude D400 Service Manual
DellTM LatitudeTM D400 Service Manual
Before You Begin
Preparing to Work Inside the Computer
Recommended Tools
Computer Orientation
Screw Identification
Using the Dell Diagnostics
When to Use the Dell Diagnostics
Features of the Dell Diagnostics
Starting the Dell Diagnostics
System Components
Keyboard
Removing the Keyboard
Installing the Keyboard
Memory
Installing a Memory Module Under the Memory
Module/Modem Cover
Installing a Memory Module Under the Keyboard
Mini PCI Card
Modem
Hard Drive
Removing the Hard Drive
Installing the Hard Drive
Removing the Interposer
Replacing the Interposer
Docking Doors
Removing the Docking Doors
Installing the Docking Doors
BluetoothTM
Display
Removing the Display Assembly
Replacing the Display Latch
Palm Rest
Cooling Fan
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Dell Latitude D400 Service Manual
Touch Pad
System Board
Removing the System Board
Replacing the System Board
Reserve Battery
Flashing the BIOS
Speakers
Battery Latch
Pin Assignments for I/O Connectors
USB Connector
Video Connector
Serial Connector
Dell D/Bay Connector
Mini Recommended Spares List
Notes, Notices, and Cautions
NOTE: A NOTE indicates important information that helps you make better use
of your computer.
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 potential for property damage,
personal injury, or death.
Trademarks used in this text: Dell, the DELL logo, and Latitude are trademarks of Dell Inc.; Microsoft
and Windows are registered trademarks of Microsoft Corporation; Bluetooth is a trademark owned by
Bluetooth SIG, Inc. and is used by Dell Inc. under license.
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 Inc. disclaims any proprietary interest in
trademarks and trade names other than its own.
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Dell Latitude D400 Service Manual
Model PPT
October 2003 Rev. A02
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Before You Begin: Dell Latitude D400 Service Manual
Back to Contents Page
Before You Begin
DellTM LatitudeTM D400 Service Manual
Preparing to Work Inside the Computer
Recommended Tools
Computer Orientation
Screw Identification
Preparing to Work Inside the Computer
CAUTION: Only a certified service technician should perform repairs on
your computer. Damage due to servicing that is not authorized by Dell
is not covered by your warranty. Read and follow the safety instructions
in the System Information Guide that came with the computer.
CAUTION: To prevent static damage to components inside your
computer, discharge static electricity from your body before you touch
any of your computer's electronic components. You can do so by
touching an unpainted metal surface.
CAUTION: Handle components and cards with care. Do not touch the
components or contacts on a card. Hold a card by its edges or by its
metal mounting bracket. Hold a component such as a microprocessor by
its edges, not by its pins.
NOTICE: To avoid damaging the computer, perform the following steps before
you begin working inside the computer.
1. Ensure that the work surface is flat and clean to prevent scratching the
computer cover.
2. Save any work in progress and exit all open programs.
3. Turn off the computer and all attached devices.
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Before You Begin: Dell Latitude D400 Service Manual
NOTE: Ensure that the computer is off and not in a power management mode.
If you cannot shut down the computer using the computer operating system,
press and hold the power button for 4 seconds.
4. If the computer is connected to a docking device (docked), undock it.
5. Disconnect the computer from the electrical outlet.
6. To avoid possible damage to the system board, wait 10 to 20 seconds and then
disconnect any attached devices.
7. Disconnect all other external cables from the computer.
8. Remove any installed PC Cards from the PC Card slot.
9. Close the display and turn the computer upside down on a flat work surface.
NOTICE: To avoid damaging the system board, you must remove the main
battery before you service the computer.
10. Slide and hold the battery-bay latch release on the bottom of the computer, and
then remove the battery from the bay.
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Before You Begin: Dell Latitude D400 Service Manual
Recommended Tools
The procedures in this manual require the following tools:
q Phillips screwdriver
q Flat-blade screwdriver
q Small plastic scribe
q Flash BIOS update program floppy disk or CD
Computer Orientation
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Before You Begin: Dell Latitude D400 Service Manual
1 back
2 right
3 front
4 left
Screw Identification
When you are removing and replacing components, photocopy "Screw Identification"
as a tool to lay out and keep track of the screws. The screw identification chart
provides the number of screws and their sizes.
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Before You Begin: Dell Latitude D400 Service Manual
keyboard modem hard drive
(two each) (one each) (four each)
1428U 1428U 2864D
display removal display bezel display latch
(six each) (six each) (two each)
4911U 7166P 5H953
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Before You Begin: Dell Latitude D400 Service Manual
palm rest fan system board
(thirteen each) (three each) (six each)
4911U 1428U 1428U
(two each) (one each, if a BIOS card is present)
5H953 1428U
speakers
(two each)
4911U
Back to Contents Page
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Before You Begin: Dell Latitude D400 Service Manual
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Using the Dell Diagnostics:
Back to Contents Page
Using the Dell Diagnostics
When to Use the Dell Diagnostics
Features of the Dell Diagnostics
Starting the Dell Diagnostics
When to Use the Dell Diagnostics
Whenever a major component or device in your computer does not function properly,
you may have a component failure. If you are experiencing a problem with your DellTM
computer, perform the checks in the "Solving Problems" section in the User's Guide
and run the Dell Diagnostics before you call Dell for technical assistance. Running the
Dell Diagnostics may help you to resolve the problem yourself quickly without having
to contact Dell for assistance.
If you are experienced with computers and know what component(s) you need to test,
select the appropriate diagnostic test group(s) or subtest(s). If you are unsure about
how to begin diagnosing a problem, see "Starting the Dell Diagnostics."
Features of the Dell Diagnostics
The Dell Diagnostics helps you to check your computer hardware without any
additional equipment and without destroying any data. By using the diagnostics, you
can have confidence in the operation of your computer. If you find a problem that you
cannot solve by yourself, the diagnostic tests can provide you with important
information you need when talking to Dell's service and support personnel.
NOTICE: Use the Dell Diagnostics to test only your Dell computer. Using this
program with other computers may cause incorrect computer responses or
result in error messages.
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Using the Dell Diagnostics:
The diagnostic test groups or subtests also have the following features:
q Options that let you perform express, extended, or custom tests on one or all
devices
q An option that allows you to select tests based on a symptom of the problem
you are having
q An option that allows you to choose the number of times a test group or subtest
is repeated
q The ability to display test results
q Options to temporarily suspend testing if an error is detected, or to terminate
testing
q Extensive online Help that describes the tests and devices
q Status messages that inform you whether test groups or subtests were
completed successfully
q Error messages that appear if any problems are detected
Starting the Dell Diagnostics
The Dell Diagnostics is located on a hidden Diagnostic utility partition on your hard
drive.
NOTE: If your computer cannot display a screen image, contact Dell. See the
User's Guide for contact information.
1. Shut down the computer.
2. If the computer is connected to a docking device (docked), undock it. See the
documentation that came with your docking device for instructions.
3. Connect the computer to an electrical outlet.
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Using the Dell Diagnostics:
NOTE: If you do not see anything on your display, hold down the mute button
and press the power button (instead of ) to begin the Dell Diagnostics.
You do not need to highlight Diagnostics and press . The computer
automatically runs the Pre-boot System Assessment.
4. Turn on the computer. When the DELLTM logo appears, press
immediately. If you wait too long and the Microsoft