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Dell Latitude D420 Service Manual

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See also: User Manual , Setup Manual
Dell™ Latitude™ D420 Service Manual
Before You Begin
Hard Drive
Hinge Cover
Keyboard
Coin-Cell Battery
Internal Card With Bluetooth® Wireless Technology
Memory and Mini-Cards
Display Assembly
Palm Rest
Speaker
 
 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.
Information in this document is subject to change without notice.
© 2006 Dell Inc. All rights reserved.
Reproduction in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden.
Trademarks used in this text: Dell, the DELL logo, and Latitude are trademarks of Dell Inc.; 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.
June 2006 Rev. A00
Suspend-Switch Sensor Board
System Board
Fan
PC Card/Smart Card Reader
Modem
Wireless Switch
Power Button Assembly
Battery Latches
Pin Assignments for I/O Connectors
Flashing the BIOS

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Summary of Contents for Dell Latitude D420

  • Page 1 © 2006 Dell Inc. All rights reserved. Reproduction in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden. Trademarks used in this text: Dell, the DELL logo, and Latitude are trademarks of Dell Inc.; 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.

  • Page 2: Battery Latches

    Back to Contents Page   Battery Latches Dell™ Latitude™ D420 Service Manual   CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.   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.
  • Page 3 screw driver bracket securing tab shorter battery-latch assembly computer base     Back to Contents Page  ...

  • Page 4: Before You Begin

    Hold a component such as a processor by its edges, not by its pins. 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.
  • Page 5 4. Disconnect all telephone or network cables from the computer.   5. 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.  ...

  • Page 6: Internal Card With Bluetooth® Wireless Technology

    Back to Contents Page   Internal Card With Bluetooth® Wireless Technology Dell™ Latitude™ D420 Service Manual   CAUTION: Before performing the following procedures, read the safety instructions in your Product Information Guide. NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching a connector on the back panel of the computer.
  • Page 7 Back to Contents Page   PC Card/Smart Card Reader Dell™ Latitude™ D420 Service Manual   CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.   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.

  • Page 8: Coin-Cell Battery

    Back to Contents Page   Coin-Cell Battery Dell™ Latitude™ D420 Service Manual   CAUTION: Before performing the following procedures, follow the safety instructions in your Product Information Guide. NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching a connector on the back panel of the computer.
  • Page 9 You can increase your computer memory by installing memory modules on the system board. See "Specifications" in your computer User's Guide for information about the memory supported by your computer. Install only memory modules that are intended for your computer. NOTE: Memory modules purchased from Dell are covered under your computer warranty.   CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
  • Page 10 8. Turn on the computer. As the computer boots, it detects the additional memory and automatically updates the system configuration information. To confirm the amount of memory installed in the computer, click Start® Help and Support® Dell System Information.  Mini-Cards  ...
  • Page 11 antenna cables (2) a.  Disconnect the antenna cables from the WLAN card. NOTICE: To prevent damage to the connector, do not use tools to spread the securing clips. b.  Release the card by pushing the metal securing clips toward the back of the computer until the card pops up slightly. c.
  • Page 12   Mobile Broadband (WWAN) Cards NOTE: Mobile Broadband cards may not be available in all regions. If you ordered a Mobile Broadband card with your computer, the card is already installed.   CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.  ...
  • Page 13 NOTICE: To avoid damaging the Mobile Broadband card, never place cables on top of or under the card and ensure that you route the cables properly. NOTE: Cable routing for the Mobile Broadband card may vary. b.  Align the card with the connector at a 45-degree angle, and press the card into the connector until you feel a click. 1 Mobile Broadband card 2 system board connector NOTE: For more specific information about which cable to connect to which connector, see the documentation that came with your Mobile Broadband...
  • Page 14 1 metal tabs (2) on SIM card slot 2 SIM card with cut-off corner NOTE: When you replace the SIM card, ensure that you slide the SIM card under the two metal tabs on the SIM card slot with the cut-off corner of the card facing toward the back of the computer.

  • Page 15: Removing The Display Assembly

    Back to Contents Page   Display Assembly Dell™ Latitude™ D420 Service Manual   Removing the Display Assembly   Removing the Display Bezel   Removing the Display Panel   Removing the Display-Panel Brackets   Removing the Display Cable   Removing the Display Latch   CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

  • Page 16: Removing The Display Bezel

    6. Pull on the display cable pull-tab toward the back of the computer to disconnect the display cable from the display connector on the system board.   7. Lift the display assembly away from the computer. Mini-Card antenna cables display cable display assembly NOTE: When you replace the display assembly, route the Mini-Card antenna cables through the system board and turn the computer upside down to...

  • Page 17: Removing The Display-Panel Brackets

    1 M2 x 2 display 3 top 3-mm panel cover screws  Removing the Display-Panel Brackets   1. Remove the four M2 x 3-mm screws (two on each bracket) from the display-panel brackets. display-panel brackets (2) M2 x 3-mm screws (4) display panel  Removing the Display Cable 1 back of display-panel cable...

  • Page 18: Removing The Display Latch

     Removing the Display Latch M2 x 3-mm screws (2) screw holders (2) display latch metal plate display base     Back to Contents Page  ...
  • Page 19 Back to Contents Page   Fan Dell™ Latitude™ D420 Service Manual   CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.   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.

  • Page 20: Flashing The Bios

    Back to Contents Page   Flashing the BIOS Dell™ Latitude™ D420 Service Manual   1. Ensure that the AC adapter is plugged in and that the main battery is installed properly. NOTE: If you use a BIOS update program CD to flash the BIOS, set up the computer to boot from a CD before inserting the CD.

  • Page 21: Removing The Hard Drive

    Back to Contents Page   Hard Drive Dell™ Latitude™ D420 Service Manual   Removing the Hard Drive   Dismantling the Hard Drive   Replacing the Hard Drive   CAUTION: If you remove the hard drive from the computer when the drive is hot, do not touch the metal housing of the hard drive.
  • Page 22 The replacement hard drive ships with the protective cover and the hard drive cable. Only a certified service technician should dismantle the hard drive. Damage due to servicing that is not authorized by Dell is not covered by your warranty.

  • Page 23: Replacing The Hard Drive

    ZIF connector hard drive cable  Replacing the Hard Drive NOTICE: Use firm and even pressure to slide the drive into place. If you use excessive force, you may damage the connector.   1. Follow the steps in Removing the Hard Drive in reverse order.

  • Page 24: Hinge Cover

    Back to Contents Page   Hinge Cover Dell™ Latitude™ D420 Service Manual   CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product 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 a connector on the back of the computer).
  • Page 25 Back to Contents Page   Keyboard Dell™ Latitude™ D420 Service Manual   CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product 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 a connector on the back of the computer).
  • Page 26 Back to Contents Page   Modem Dell™ Latitude™ D420 Service Manual   CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.   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.

  • Page 27: Removing The Palm Rest

    Back to Contents Page   Palm Rest Dell™ Latitude™ D420 Service Manual   Removing the Palm Rest   Replacing the Palm Rest  Removing the Palm Rest   CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
  • Page 28 M2.5 x 5-mm screws (6) NOTICE: Pull on the plastic tab on top of the connectors to avoid damaging the connectors.   11. Disconnect the speaker connector from the system board.   12. Disconnect the Secure Digital/SIM card reader cable from the system board.  ...

  • Page 29: Replacing The Palm Rest

     Replacing the Palm Rest   1. Align the palm rest with the computer base and gently snap into place.   2. Connect the LED board connector to the system board.   3. Connect the touch pad connector to the system board.  ...

  • Page 30: Pin Assignments For I/O Connectors

    Back to Contents Page   Pin Assignments for I/O Connectors Dell™ Latitude™ D420 Service Manual   USB Connector   Video Connector  USB Connector     Signal USB5V+ USBP– USBP+  Video Connector         Signal Signal CRT_R 9 CRT_G 10 CRT_B 11 MONITOR_DETECT– DDC_DATA CRT_HS...

  • Page 31: Power Button Assembly

    Back to Contents Page   Power Button Assembly Dell™ Latitude™ D420 Service Manual   CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.   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.
  • Page 32 Back to Contents Page   Suspend-Switch Sensor Board Dell™ Latitude™ D420 Service Manual   CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.   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.

  • Page 33: Wireless Switch

    Back to Contents Page   Wireless Switch Dell™ Latitude™ D420 Service Manual   CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.   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.
  • Page 34 Back to Contents Page   Speaker Dell™ Latitude™ D420 Service Manual   CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product 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.

  • Page 35: Removing The System Board

    Back to Contents Page   System Board Dell™ Latitude™ D420 Service Manual   Removing the System Board   Replacing the System Board  Removing the System Board   CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

  • Page 36: Replacing The System Board

    1 computer base 2 M2.5 x 5-mm screws (2) 3 system board assembly 4 power button connector 5 suspend-switch sensor board      Replacing the System Board   1. Follow all of the steps in Removing the System Board in reverse order. NOTICE: Before turning on the computer, replace all screws and ensure that no stray screws remain inside the computer.
  • Page 37 Reproduction in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden. Trademarks used in this text: Dell, the DELL logo, and Latitude are trademarks of Dell Inc.; Intel is a registered trademark of Intel Corporation; Bluetooth is a trademark owned by Bluetooth SIG, Inc. and is used by Dell Inc. under license.

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