Dell latitude d400 schematic

Dell Latitude D400 Service Manual

Dell™ Latitude™ 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
Bluetooth™
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

Dell™ Latitude™ 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:

● Phillips screwdriver

● Flat-blade screwdriver

● Small plastic scribe

● 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

(two each)

1428U

modem

(one each)

1428U

hard drive

(four each)

2864D

display removal

(six each)

4911U

display bezel

(six each)

7166P

display latch

(two each)

5H953

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Before You Begin: Dell Latitude D400 Service Manual

palm rest

(thirteen each)

4911U

(two each)

5H953

fan

(three each)

1428U

system board

(six each)

1428U

(one each, if a BIOS card is present)

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 Dell™
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:

● Options that let you perform express, extended, or custom tests on one or all

devices

● An option that allows you to select tests based on a symptom of the problem

you are having

● An option that allows you to choose the number of times a test group or subtest

is repeated

● The ability to display test results

● Options to temporarily suspend testing if an error is detected, or to terminate

testing

● Extensive online Help that describes the tests and devices

● Status messages that inform you whether test groups or subtests were

completed successfully

● 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 <F12>) to begin the Dell Diagnostics.
You do not need to highlight Diagnostics and press <Enter>. The computer
automatically runs the Pre-boot System Assessment.

4. Turn on the computer. When the DELL™ logo appears, press <F12>
immediately. If you wait too long and the Microsoft® Windows® logo appears,
continue to wait until you see the Windows desktop. Then shut down your
computer and try again.

5. When the boot device list appears, highlight Diagnostics and press <Enter>.

The computer begins to run the Pre-boot System Assessment, a series of
embedded diagnostics that perform initial testing on your system board,
keyboard, hard drive, and display.

● During the assessment, answer any questions that appear.

● If a component failure is detected, the computer stops and beeps. To stop

the assessment and reboot to the operating system, press <N>; to
continue to the next test, press <Y>; to retest the component that failed,
press <R>.

● If failures are detected during the Pre-boot System Assessment, write

down the error code(s) and contact Dell before continuing on to the Dell
Diagnostics. See the User's Guide for contact information.

● If you receive a message stating that no Diagnostics utility partition has

been found, follow the instructions on the screen to run the Dell
Diagnostics from your Drivers and Utilities CD.

If the Pre-boot System Assessment completes successfully, you receive the
message Booting Dell Diagnostic Utility Partition. Press any key to

continue.

6. Press any key to start the Dell Diagnostics from the Diagnostics utility partition
on your hard drive.

7. After the Dell Diagnostics loads and the Main Menu screen appears, click the
button for the option you want.

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Using the Dell Diagnostics:

NOTE: The Service Tag for your computer is located in the title bar of each

screen.

Option Function

Express Test Performs a quick test of devices. The test typically takes 10 to 20

minutes and requires no interaction on your part. Run Express Test
first to increase the possibility of tracing the problem quickly.

Extended Test Performs a thorough check of devices. The test typically takes 1

hour or more and requires you to answer questions periodically.
Custom Test Tests a specific device. You can customize the tests to be run.
Symptom Tree Allows you to select tests based on a symptom of the problem you

are experiencing. The option lists the most common symptoms.

8. If a problem is encountered during a test, a message appears, displaying the
error code and a description of the problem. Write down the error code and
problem description and follow the instructions on the screen. If you cannot
resolve the error condition, contact Dell. See the User's Guide for contact
information.

9. If you run a test from the Custom Test or Symptom Tree option, click the
applicable tab described in the following table for more information.

Tab Function

Results Displays the results of the test and any error conditions encountered.
Errors Displays error conditions encountered, error codes, and problem

description.

Help Describes the test and may indicate requirements for running the

test.

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Using the Dell Diagnostics:

Configuration Displays your hardware configuration for the selected device.

The Dell Diagnostics obtains your configuration information for all
devices from the system setup program, memory, and various
internal tests and displays the information in the device list in the left
pane of the screen (see the User's Guide for information on the
system setup program). The device list may not display the names of
all the components installed on your computer or all devices attached
to your computer.

Parameters Allows you to customize the test by changing the test settings.

10. When you have finished running a test, close the screen to return to the Main

Menu screen. To exit the Dell Diagnostics and reboot the computer, close the
Main Menu screen.

Back to Contents Page

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System Components:

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System Components

NOTICE: 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.

NOTICE: Unless otherwise noted, each procedure in this document assumes

that a part can be replaced by performing the removal procedure in reverse
order.

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System Components:

1

display P1291

10

smart card reader 0X740

2

keyboard P1290

11

hard drive

See Mini RSL

3

palm rest 4U782

12

memory module cover P0777

4

speaker 4U782

13

battery

See Mini RSL

5

DIMM1 cover 2X386

14

computer base D2389

6

metal shield 2X370

15

reserve battery 3U490

7

Hard drive controller
card

2X372

16

display connector 2X241

8

system board

See Mini RSL

17

center control cover 5U447

9

fan 6U568

Back to Contents Page

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Keyboard:

Back to Contents Page

Keyboard

Removing the Keyboard
Installing the Keyboard

Removing the Keyboard

CAUTION: Before performing the following procedures, read the safety

instructions in your System Information Guide.

NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist

grounding strap or by periodically touching an unpainted metal surface (such as
the back panel) on the computer.

1. Follow the instructions in "

Preparing to Work Inside the Computer" to remove

the battery and prepare the computer for work.

2. Open the display approximately 180 degrees.

3. Use a plastic scribe or, if a plastic scribe is not available, carefully use a small
flat-blade screwdriver to lift the notched right edge of the center control cover,
and pry the cover loose from the bottom case.

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