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Dell Latitude C840 Service Manual
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Dell Latitude C840 Service Manual

Dell Latitude C840 Service Manual

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Dell™ Latitude™ C840 Service Manual
Before You Begin
Preparing to Work Inside the Computer
Recommended Tools
Computer Orientation
Screw Identification
System Components
Hard Drive and Fixed Optical Drive
Hard Drive
Fixed Optical Drive
System Upgrades
Memory Modules
Modem Daughter Card
Mini PCI Card
Keyboard
Display
Display Overview
Hinge Cover
Display Assembly
Display Bezel
Display Panel
Display Latch
Microprocessor Thermal-Cooling Assembly
Microprocessor Module
Video Graphics Board
Palm Rest
Reserve Battery
System Board
Battery and Module Bay Latches
Battery Charger Board
LED Board
Fan
RJ-11/RJ-45 Module
Pin Assignments for I/O Connectors
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.
© 2002 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; Intel is a registered trademark of Intel Corporation; Microsoft and
Windows are registered trademarks of Microsoft 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.
This product incorporates copyright protection technology that is protected by method claims of certain U.S. patents and other intellectual property rights owned by Macrovision
Corporation and other rights owners. Use of this copyright protection technology must be authorized by Macrovision Corporation, and is intended for home and other limited
viewing uses only unless otherwise authorized by Macrovision Corporation. Reverse engineering or disassembly is prohibited.
February 2002   Rev. A00

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  • Page 1 Windows are registered trademarks of Microsoft 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.

  • Page 2: Removing The Battery Charger Board

    Back to Contents Page Battery Charger Board Dell™ Latitude™ C840 Service Manual NOTICE: Disconnect the computer and attached devices from electrical outlets and remove any installed batteries. NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.
  • Page 3 Back to Contents Page Battery and Module Bay Latches Dell™ Latitude™ C840 Service Manual NOTICE: Disconnect the computer and attached devices from electrical outlets and remove any installed batteries. NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.
  • Page 4 Back to Contents Page      ...

  • Page 5: Before You Begin

    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 warrantly. Read and follow all safety instructions in "Safety and EMC Instructions: Portable Computers" in your System Information Guide.

  • Page 6: Screw Identification

    Screw Identification When you are removing and replacing components, photocopy the placemat as a tool to lay out and keep track of the component screws. The placemat provides the number of screws and the sizes. Screw Identification   NOTICE: When reinstalling a screw, you must use a screw of the correct diameter and length. Ensure that the screw is properly aligned with its corresponding hole, and avoid overtightening.
  • Page 7 Palm Rest Bracket: M2.5 x 20 mm (1 each) M2.5 x 4 mm (4 each) Fan: Memory Module/Modem Cover: Modem Daughter Card: M2 x 4 mm (3 each) M2.5 x 20 mm (1 each) M2 x 3 mm (1 each) Mini PCI Card:  ...

  • Page 8: Removing The Microprocessor Module

    Back to Contents Page Microprocessor Module Dell™ Latitude™ C840 Service Manual   NOTICE: Disconnect the computer and attached devices from electrical outlets and remove any installed batteries. NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.

  • Page 9: Replacing The Microprocessor Module

      1 cam screw 2 perpendicular screwdriver 3 processor die (do not touch) b.  Use the microprocessor extraction tool to remove the microprocessor module. Replacing the Microprocessor Module NOTICE: If you received a flash BIOS update floppy disk or CD with the replacement microprocessor, you must update the BIOS after replacing the microprocessor module.

  • Page 10: Display Overview

    Back to Contents Page Display Dell™ Latitude™ C840 Service Manual   Display Overview   Hinge Cover   Display Assembly   Display Bezel   Display Panel   Display Latch Display Overview     NOTICE: Disconnect the computer and attached devices from electrical outlets and remove any installed batteries. NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.

  • Page 11: Display Assembly

      1 hinge cover 1.  Follow the instructions in "Preparing to Work Inside the Computer." 2.  Use a nonmarring plastic scribe to loosen the hinge cover at the back and at each side of the computer. 3.  Open the computer and use the scribe to pry between the key and the hinge cover until the hinge cover pops off.
  • Page 12   M2.5 x 6-mm screw strain relief display flex cable pull loop 2.  Remove the M2.5 x 6-mm flex-cable strain relief screw, and then use the pull loop to remove the display flex cable from the graphics card. NOTICE: When reconnecting the flex cable, press down on both ends of the connector, not in the middle. Pressing the middle of the connector can damage fragile components.

  • Page 13: Display Bezel

    1 M2.5 x 4-mm screws (6) M2 x 3-mm screws (6) 2 rubber screw covers (4) top cover 3 display bezel 10 hinge cover 4 plastic tabs (6) 11 display flex cable 5 M2.5 x 4-mm screw 12 display panel 6 flex-cable mounting bracket 13 plastic screw covers (2) 7 display latch...

  • Page 14: Replacing The Display Panel

    Replacing the Display Panel NOTE: Use a magnetic screwdriver to reassemble the display panel in the display. 1.  Connect the flex cable to the two connectors on the back of the display panel. 2.  Place the display panel in the top cover, taking care that the flex cable is in place and is not crushed or crimped. 3.

  • Page 15: Removing The Fan

    Back to Contents Page Dell™ Latitude™ C840 Service Manual NOTICE: Disconnect the computer and attached devices from electrical outlets and remove any installed batteries. NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.

  • Page 16: Removing The Hard Drive

    Dell™ Latitude™ C840 Service Manual   Hard Drive   Fixed Optical Drive 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. Hard Drive NOTICE: Disconnect the computer and attached devices from the electrical outlet and remove any installed batteries.

  • Page 17: Removing The Fixed Optical Drive

      captive screw pull tab Removing the Fixed Optical Drive 1.  Follow the instructions in "Preparing to Work Inside the Computer." 2.  Loosen the captive screw on the bottom of the computer. 3.  Turn the computer over (to keep the captive screw from interfering with the pull tab) and pull out the pull tab. 4.

  • Page 18: Removing The Keyboard

    Back to Contents Page Keyboard Dell™ Latitude™ C840 Service Manual   NOTICE: Disconnect the computer and attached devices from electrical outlets and remove any installed batteries. NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.

  • Page 19: Replacing The Keyboard

      blank key keyboard right side of computer 5.  Lift the right end of the keyboard and slide it slightly toward the right side of the computer to disengage the tabs at the left end. 6.  Pivot the keyboard and balance it upright on the left side of the computer.  ...
  • Page 20 2.  Insert the metal tabs at the left end of the keyboard under the edge of the bottom case, and fit the keyboard into place. 3.  Check that the keyboard is correctly installed. The keys should be flush with the left and right surfaces of the palm rest. 4.

  • Page 21: Removing The Led Board

    Back to Contents Page LED Board Dell™ Latitude™ C840 Service Manual NOTICE: Disconnect the computer and attached devices from electrical outlets and remove any installed batteries. NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.

  • Page 22: Removing The Palm Rest

    Back to Contents Page Palm Rest Dell™ Latitude™ C840 Service Manual   NOTICE: Disconnect the computer and attached devices from electrical outlets and remove any installed batteries. NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.

  • Page 23: Replacing The Palm Rest

      1 M2.5 x 20-mm screws (9) 8.  Turn the computer over. 9.  Use the pull loop to disconnect the palm-rest flex cable from the touch-pad connector on the system board. 10.  On the left and right sides of the palm rest, use a flat-blade scribe between the palm rest and the bottom case of the computer to separate the snaps that secure the palm rest to the bottom case.

  • Page 24: Pin Assignments For I/O Connectors

    Back to Contents Page Pin Assignments for I/O Connectors Dell™ Latitude™ C840 Service Manual USB Connector     Signal -Data +Data Ground Serial Connector     Signal Signal RXDA TXDA     Parallel Connector     Signal Signal STRB# BUSY...

  • Page 25: S-Video Tv-Out Connector

    SLCT AFDF# ERROR# INIT# PD5F SLCT_IN PD6F 18-23 PD7F DFDD/LPT# ACK# Video Connector     Signal Signal CRT_VCC GREEN BLUE MSEN# DAT_DDC2 HSYNC VSYNC CLK_DDC2     PS/2 Connector     Signal DAT_KBD DAT_SM1 PS2VCC CLK_KBD CLK_SM1 S-Video TV-Out Connector  ...

  • Page 26: Docking Connector

      S-Video Signal DLUMA-L DCRMA-L   Composite Video Signal SPDIF DCMPS-L SPGND Docking Connector     Signal Signal STRB#/5V VGA_GRN VGA_RED VGA_BLU DOCK_SD/MODE D_IRTX D_IRRX SPIRQB# DOCK_SPKR SPIRQC# DOCK_MIC DAT_DDC2 DOCK_LINE CLK_DDC2 DOCK_CDROM SPAR SPME# M_SEN# POWER_SW# SSERR# QPCIEN# SPERR# S1.6M_EN# SLOCK# DFDD/LPT#...
  • Page 27 SDEVSEL# STRDY# D_ATCTLED SIRDY# D_PWRLED SFRAME# DOCK_PWR_SRC SCLKRUN# DOCK_PWR_SRC DOCK_PWR_SRC SGNTA# SREQA# +5VDOCK SGNT0# +5VDOCK SREQ0# +5VDOCK SPCIRST# +5VDOCK SH1SEL# +5VDOCK SWRPRT# DOCK_PWR_SRC SDSKCHG#/DRQ DOCK_PWR_SRC SDIR# DOCK_PWR_SRC STRK0# DOCK_PWR_SRC SSTEP# SDRV1# DOCK_+DC_IN DOCK_+DC_IN SMRT1# DOCK_+DC_IN SWRDATA# DOCK_+DC_IN SWGATE# DOCK_+DC_IN SRDATA# DOCK_+DC_IN SINDEX# DOCK_+DC_IN...

  • Page 28: Ieee 1394 Connector

    DCLK_SMB SAD20 SMB_INIT# SAD21 DAT_DOCKSM1 SAD22 CLK_DOCKSM1 SAD23 DAT_DOCKKBD SAD24 CLK_DOCKKBD SC/BE3# SAD25 CTS0 SAD26 RTS0 SAD27 DSR0 SAD28 SAD29 DTR0 SAD30 TXD0# SAD31 RXD0# DCD0 +5VSUS IEEE 1394 Connector     Signal TPB- TPB+ TPA- TPA+ Back to Contents Page  ...

  • Page 29: Removing The Reserve Battery

    Back to Contents Page Reserve Battery Dell™ Latitude™ C840 Service Manual NOTICE: Disconnect the computer and attached devices from electrical outlets and remove any installed batteries. NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.

  • Page 30: Replacing The Reserve Battery

    1 M2.5 x 4-mm screws (4) 2 palm rest bracket 3 palm-rest flex cable 7.  Remove the four M2.5 x 4-mm screws that secure the palm rest bracket. 8.  While supporting the palm-rest flex cable, lift out the palm rest bracket and turn it over. 9.
  • Page 31 Back to Contents Page RJ-11/RJ-45 Module Dell™ Latitude™ C840 Service Manual NOTICE: Disconnect the computer and attached devices from electrical outlets and remove any installed batteries. NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.
  • Page 32 vertical slot modem cable When replacing the system board, ensure that the network cable is safely above the board and out of the way. Back to Contents Page      ...

  • Page 33: Removing The System Board

    Back to Contents Page System Board Dell™ Latitude™ C840 Service Manual NOTICE: Disconnect the computer and attached devices from electrical outlets and remove any installed batteries. NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.
  • Page 34 13.  Separate the network cable from the system board: a.  First remove the network cable cover: Insert a narrow plastic scribe or small screwdriver just barely into the slot that faces the back of the computer (do not insert the scribe far enough to catch on the wires inside), press down on the cover lightly to secure it, and pry upward to release the cover.
  • Page 35 Back to Contents Page      ...

  • Page 36: System Components

    Back to Contents Page System Components Dell™ Latitude™ C840 Service Manual NOTICE: Unless otherwise noted, each procedure in this document assumes that a part can be replaced by performing the removal procedure in reverse order.     1 display assembly main battery 2 hinge cover...

  • Page 37: Removing The Microprocessor Thermal-Cooling Assembly

    Back to Contents Page Microprocessor Thermal-Cooling Assembly Dell™ Latitude™ C840 Service Manual   NOTICE: Disconnect the computer and attached devices from electrical outlets and remove any installed batteries. NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.
  • Page 38 1 microprocessor thermal- cooling assembly NOTICE: To ensure maximum cooling for the microprocessor, do not touch the heat transfer areas on the microprocessor thermal-cooling assembly. The oils in your skin reduce the heat transfer capability of the thermal pads. 5.  Lift out the thermal-cooling assembly. Back to Contents Page  ...

  • Page 39: Notes, Notices, And Cautions

    Back to Contents Page Dell™ Latitude™ C840 Service Manual   Notes, Notices, and Cautions 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.

  • Page 40: System Upgrades

    Back to Contents Page System Upgrades Dell™ Latitude™ C840 Service Manual   Memory Modules   Modem Daughter Card   Mini PCI Card Memory Modules NOTICE: Disconnect the computer and any attached devices from electrical outlets and remove any installed batteries. NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.

  • Page 41: Removing The Memory Modules

      1 DIMM B 2 memory module sockets 3 DIMM A socket 4 modem daughter card 5 metal tabs (2 per socket) Removing the Memory Modules 1.  Remove the memory module/modem cover. 2.  To release a memory module from its socket, spread apart the tabs at each side of the module until the module pops up slightly. 3.

  • Page 42: Mini Pci Card

      modem daughter card M2 x 3-mm screw 3.  Remove the M2 x 3-mm screw that secures the modem daughter card to the system board. 4.  Use the pull tab to pull the modem daughter card straight up out of its connector. NOTICE: Do not pull on the modem cable.

  • Page 43: Removing The Mini Pci Card

    M2.5 x 20-mm screw Removing the Mini PCI Card 1.  Follow the instructions in "Preparing to Work Inside the Computer." 2.  Remove the M2.5 x 20-mm screw and then remove the Mini PCI card cover. 3.  To release the Mini PCI card, spread the metal securing tabs until the card pops up slightly. 4.

  • Page 44: Removing The Video Graphics Board

    6.  Separate the video graphics board from the system board connector. Replacing the Video Graphics Board 1.  Align the three screw holes and press down firmly on the word "Dell" to seat the board in its connector. NOTICE: Ensure that the board is correctly and firmly seated before continuing. Failure to do so will cause intermittent video failures.

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