Dell C540 User's Manual
Contents
1. Remove the display bezel Remove the hinge covers Remove the two M2 x 4 mm screws on the left side of the display panel and the two M2 x 4 mm screws on the right side of the display panel F4 NOTE If you have a Hitachi display panel remove the two M2 x 4 mm screws from the center of the left side of the display panel Remove the M2 x 4 mm screw that secures the display feed flex cable through the black plastic flex cable retention bracket Lift from the top and rotate the display panel out of the top cover Disconnect the bottom flex cable connector from the inverter connector by pulling straight up on the attached pull tab 1 aspiy panel connector 2 top ex cable connector fer oo potom ex cabe connector S inverer connector 9 Remove the tape that secures the display panel connector and the tape that secures the middle of the display feed flex cable to the display panel 10 Pull the top flex cable connector down and away to remove it from the display panel connector Replacing the Display Panel 1 Reconnect the top flex cable connector to the display panel connector 2 Reconnect the bottom flex cable connector to the inverter connector 3 Replace the tape that secures the display panel connector and the tape that secures the middle of the display feed flex cable to the display panel 4 Place the bottom edge of the display panel in the bottom of the top cover and lift the top of the panel with2. Preparing to Work Inside the Computer before performing the following procedure 1 Turn the computer over and remove the memory module cover which also covers the modem 2 Remove the two M2 x 3 mm screws that secure the modem to the system board NOTICE Do not pull on the modem cable Pull from the modem connector to disconnect the cable 3 Pull straight up on the attached pull tab to lift the modem out of its connector on the system board and disconnect the modem cable Replacing the Modem 1 Connect the modem cable to the modem NOTICE The connectors are keyed for correct insertion do not force the connections 2 Align the modem with the screw holes on the system board and press down on the pull tab to seat the modem in the connector NOTICE Pressing down on the modem somewhere other than on the pull tab can break the modem 3 Install the two M2 x 3 mm screws that secure the modem to the system board 4 Replace the memory module cover and tighten the two captive screws Back to Contents Page Back to Contents Page Keyboard Dell Latitude C540 C640 Service Manual Removing the Keyboard 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 touching an unpainted metal surface on the computer NOTICE Read Preparing to Work Inside the
3. Computer before performing the following procedure 1 Remove the hard drive 2 Turn the computer over and remove the five M2 5 x 12 mm screws labeled circle K M2 5 x 12 mm screws 5 3 Turn the computer over and open the display NOTICE The keycaps on the keyboard are fragile easily dislodged and time consuming to replace Be careful when removing and handling the keyboard 4 Remove the center control cover a Insert a small flat blade screwdriver or plastic scribe into the notch at the right end of the center control cover and pry up the cover b Lift the center control cover up and away from the bottom case 5 To release the keyboard from the palm rest use a small flat blade screwdriver or plastic scribe to pry up the right edge of the keyboard near the blank key keyboard 2 3 2 track stick bI 6 Lift the keyboard straight up about an inch and then rotate it forward toward the front of the computer until the key face is resting on the palm rest NOTICE Do not pull on the keyboard flex and track stick cables 7 Pull up on the keyboard connector to disconnect it from the keyboard interface connector on the system board connector 5 orientation label 8 Remove the keyboard from the bottom case Replacing the Keyboard 1 Place the keyboard on the palm rest at the front of the computer with the keys face down and the connector toward the back of the computer
4. PC Card slot 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 and secondary battery if present before you service the computer Remove the primary battery from the battery bay and the secondary battery from the module bay if a secondary battery is in use Remove any installed device in the module bay To dissipate any static electricity while you work use a wrist grounding strap or periodically touch an unpainted metal surface Handle components and cards with care Do not touch the components or contacts on a card Hold a card by it edges or by its metal mounting bracket Hold a component such as a microprocessor by its edges not by its pins Recommended Tools The procedures in this manual require the following tools e 1 magnetized Phillips screwdriver e 14 inch flat blade screwdriver e Small plastic scribe e Microprocessor extractor e Flash BIOS update program floppy disk or CD Computer Orientation Screw Identification When you are removing and replacing components photocopy the placemat as a tool to lay out and keep track of the screws The placemat provides the number of screws and their sizes H H H H H M25 x 12 mm M3x5mm M25x5mm M2xd4mm M2x3mm MI 7x35 mm NOTICE When reinstalling a screw you must use a screw of the correct diameter and length Ensure that the screw is properly aligne
5. by touching an unpainted metal surface on the computer NOTICE Read Preparing to Work Inside the Computer before performing the following procedure O 1 Remove the memory module cover NOTICE To prevent damage to the memory module connector do not use tools to spread the inner metal tabs that secure the memory module 2 Use your fingertips to carefully spread apart the inner tabs on each end of the memory module socket The module Should pop up I POI 2 memory socket __ 2 JOIN memory socke fem femea 5 inner tas 2 per socket 3 Lift the memory module out of its socket Replacing the Memory Modules 1 If you only have one memory module install it in the connector labeled J DIM1 on the system board Install a second memory module in the connector labeled J DIM2 Es NOTE Memory modules are keyed or designed to fit into their sockets in only one direction NOTI CE The memory module must be inserted at a 45 degree angle to avoid damaging the connector Align the notch in the memory module edge connector with the tab in the socket Slide the edge connector of the module firmly into the socket at a 45 degree angle and rotate the module down until it clicks into place If you do not feel the click remove the module and reinstall it Replace the memory module cover and tighten the two captive screws Mini PCI Card You must remove the Mini PCI card before the system board can be remo
6. by touching an unpainted metal surface on the computer NOTICE Read Preparing to Work Inside the Computer before performing the following procedure The speakers are located on the front left and right sides of the bottom case As you remove the speakers take note of the Speaker assembly orientations and the antenna wire routing under the routing clips 1 right speaker 2 a 2 E 4 speaker interface cable right speaker holder left speaker mounting ring speaker interface cable 1 Remove the hard drive right speaker 10 11 Em 3 inline connector f9 mounting ring 10 u a 2 Remove the keyboard 3 Remove the display assembly 4 Remove the palm rest 5 Disconnect the speaker interface cables Do not attempt to disconnect the antenna cables NOTICE Do not pull the antenna wire when removing the speaker NOTICE Handle the speaker assemblies and speakers carefully to avoid damaging the speaker cones 6 Remove the speaker assemblies by pulling them straight out of the bottom case 7 Remove the speakers from the holders by sliding the speakers out of the bottom of the holders Es NOTE The left speaker has an in line connector the left antenna cable is longer than the right antenna cable Replacing the Speaker Assemblies For each speaker 1 Slide the new speaker into its holder so that the speaker will face outward toward the speaker grill on the side of the compute
7. microprocessor module properly in the ZIF socket does not require force NOTI CE A microprocessor module that is not properly seated can result in an intermittent connection or permanent damage to the microprocessor and ZIF socket Align the pin 1 corner of the microprocessor module with the pin 1 corner of the ZIF socket and insert the microprocessor module Ka NOTE The pin 1 corner of the microprocessor module has a triangle that aligns with a triangle or missing hole on the pin 1 corner of the ZIF socket NOTICE You must position the microprocessor module correctly in the ZIF socket to avoid permanent damage to the module and the socket When the microprocessor module is correctly seated all four corners are aligned at the same height If one or more corners of the module are higher than the others the module is not seated correctly NOTICE Do not touch the processor dienear the edges of the microprocessor module on the substrate surrounding the die while turning the cam screw Press down on the edges of the microprocessor module and tighten the ZIF socket by turning the cam screw clockwise Install a new microprocessor thermal cooling assembly NOTICE To ensure proper thermal operation always install a new compatible thermal cooling assembly along with a new microprocessor 4 Update the BIOS using the flash BIOS update floppy disk or CD For instructions on how to flash the BIOS see Flashing the BIOS
8. 2 5 x 5 mm screws labeled circle B that secure the fan guard to the bottom case M2 5 x 5 mm screws 9 10 Turn the computer over and remove the M2 5 x 5 mm screw which is labeled circle B with an arrow on the front center of the system board by the battery connector M2 5 x 5 mm screw 1 2 audio connector locations pull outward here 11 Remove the speaker assemblies from the bottom case 12 Pull the right side of the bottom case next to the audio connectors away from the system board as you simultaneously lift the front of the system board out and away from the bottom case Replacing the System Board 1 Install the microprocessor module on the replacement system board 2 Install the replacement system board a Insert the external microphone and headphone connectors through the bottom case b Replace the six M2 5 x 5 mm screws starting on the right side of the bottom case c Replace the fan guard inserting the tab into the bottom case and replace the three M2 5 x 5 mm screws Replacing the screw opposite the tab first makes it easier to insert and replace the other two screws 3 Replace the modem and the microprocessor thermal cooling assembly that you removed from the old system board F4 NOTE Route cables so that they will not be crimped or pinched when the complete assembly is put back together 4 Install the right and left speaker assemblies that came with the new system board in the bottom case
9. 5 Replace the palm rest the keyboard the display assembly and the hard drive 6 Replace the module bay devices and any PC Cards or plastic blanks in the PC Card slot 7 Insert the flash BIOS update floppy disk or CD that accompanied the replacement system board and turn on the computer Follow the instructions on the screen Zi NOTE After replacing the system board enter the computer service tag sequence into the BIOS of the replacement system board Back to Contents Page Back to Contents Page Battery and Module Bay Latches Dell Latitude C540 C640 Service Manual Removing the Battery and Module Bay Latches NOTI CE Disconnect the computer and any attached devices from electrical outlets and remove any installed batteries NOTI CE To avoid ESD ground yourself by using a wrist grounding strap or by touching an unpainted metal surface on the computer NOTI CE Read Preparing to Work Inside the Computer before performing the following procedure Remove the hard drive Remove the keyboard Remove the display assembly Remove the palm rest To remove the latch release button use a plastic scribe to push inward on the snap tabs in the upper latch assembly until the latch release button is released from the bottom case To prevent the upper latch assembly from coming loose apply pressure to the latch and spring while removing the latch release button If you are also removing the upper la
10. Back to Contents Page Back to Contents Page Hybrid Cooling Fan Dell Latitude C540 C640 Service Manual Removing the Hybrid Cooling Fan 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 touching an unpainted metal surface on the computer NOTICE Read Preparing to Work Inside the Computer before performing the following procedure 1 Remove the hard drive 2 Remove the keyboard 3 Remove the display assembly 4 Remove the palm rest 5 Remove the microprocessor thermal cooling assembly 6 Remove the two M2 5 x 5 mm screws and one M2 x 3 mm screw that secure the hybrid cooling fan to the system board 1 system board interface M2 x 3 mm screw 1 connector fan power cable K M2 5 x 5 mm screws 2 spring fingers 7 hybrid cooling fan keyboard screw hole pt 7 Disconnect the fan power cable from the system board interface connector and remove the hybrid cooling fan Fi NOTE The fan power cable is long and can be pulled out from under the EMI shield to provide access to the connector NOTICE Do not block the keyboard screw hole when reinstalling the fan Route the fan power cable under the spring fingers and behind the keyboard screw hole to prevent damage to the fan power cable Back to Contents Page Back to Contents Page Reserve Batt
11. Dell Latitude C540 C640 Service Manual Before You Begin System Components Hard Drive Memory Modules Mini PCI Card and Modem Keyboard Display Assembly Display Latch and Hinge Covers Palm Rest Microprocessor Thermal Cooling Assembly Microprocessor Module Hybrid Cooling Fan Reserve Battery Flashing the BIOS Speaker Assemblies System Board Battery and Module Bay Latches Pin Assignments for I O Connectors Notes Notices and Cautions Es 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 A CAUTI ON A CAUTI ON indicates a potential for property damage personal injury or death Information in this document is subject to change without notice 2002 2003 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 April 2003 Rev AO1 Back to Contents Page Before You Begin Dell L
12. NOTICE To avoid damage to the connector pins press the keyboard connector evenly into the interface connector on the system board and do not reverse the keyboard connector 2 Connect the keyboard connector to the interface connector on the system board The keyboard connector may have a label showing the correct orientation of the keyboard connector relative to the display in the system board interface connector 3 Carefully turn the keyboard over Align the keyboard boss supports fit the left side of the keyboard into place and then snap the right side of the keyboard into place NOTICE Position the keyboard flex and track stick cables so that they are not pinched when you replace the keyboard In the bottom case 4 Check that the kevboard is correctiv installed The kevs should be flush with the left and right surfaces of the palm rest 5 Replace the center control cover close the displav assembiv and then turn the computer over 6 Reinstall the five M2 5 x 12 mm screws in the holes labeled circle K Back to Contents Page Display Assembly Display Latch and Hinge Covers Dell Latitude C540 C640 Service Manual Display Assembly Display Latch Hinge Covers Display Assembly O O 14 N UJ NOTICE You must remove the display assembly before you remove the palm rest NOTICE Disconnect the computer and any attached devices from electrical outlets and remove any installed batt
13. V Out Connector S Video ET ooo Composite Video E CE E ew e a toe pocx solmove 6 Jo E osx s eo is eso E e as sio Re pne fios sive D PWRLED SFRAME 126 SCLKRUN 136 SDSKCHG DRQ o fo fim sonia 143 SWRDATA 66 DOCK MCLK 166 SAD10 ERROR 170 SAD13 ACK 171 SAD14 INIT 173 SAD16 SLCT_IN SC BE1 BUSY CD BE2 SLCT 177 SAD17 DAT_SMB 179 SAD19 1800 DCLK SMB 180 SAD20 SMB INITH 181 SAD21 DAT DOCKSM1 SAD22 84 JCLK DOCKSMI SAD23 DAT DOCKKBD SAD24 86 JCLK DOCKKBD SC BE3 89 CTSO 189 SAD26 90 RTSO 190 SAD27 DSRO 191 SAD28 DTRO SAD30 TXDO SAD31 RXDO 195 GND 96 DCDO 196 INC 98 5VSUS 198 INC mu fuso ne CU O O a ot O O O D gt mr un O D
14. atitude C540 C640 Service Manual Preparing to Work Inside the Computer Recommended Tools Screw Identification Preparing to Work Inside the Computer A A 10 11 12 15 CAUTI ON Before working inside vour computer read the safetv instructions in vour Svstem Information Guide CAUTION Oniv a certified service technician should perform repairs on vour computer Damage due to servicing that is not authorized by Dell is not covered by your warranty NOTICE To avoid damaging the computer perform the following steps before you begin working inside the computer Ensure that the work surface is clean to prevent scratching the computer cover Save any work in progress and exit all open programs Turn off the computer and all attached devices F4 NOTE Before turning off the computer ensure that the computer is 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 If the computer is connected docked to a docking device undock it See the documentation that came with the docking device for instructions Disconnect the computer and any attached devices from electrical outlets To avoid possible damage to the system board wait 10 to 20 seconds and then disconnect any attached devices Disconnect all other external cables from the computer Remove any installed PC Cards or plastic blanks from the
15. bottom case 2 M25 x S mm screws 6 6 displey eed fox cane afinco e ospiey panes Removing the Display Bezel 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 touching an unpainted metal surface on the computer NOTICE Read Preparing to Work Inside the Computer before performing the following procedure 1 Remove the hard drive 2 Remove the display assembly 3 Use a plastic scribe to pry the six rubber screw covers out of the screw holes located on the front of the bezel 4 Remove the six M2 5 x 5 mm screws located on the front of the bezel O NOTICE Carefully separate the bezel from the top cover to avoid damage to the bezel 5 Starting at the bottom of the display panel by the Dell logo use your fingers to separate the bezel from the top cover by lifting the inside of the bezel while pushing in on the outside Removing the Display Panel Q O NOTI CE 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 touching an unpainted metal surface on the computer NOTI CE Read Preparing to Work Inside the Computer before performing the following procedure Remove the hard drive Remove the display assembly
16. d with its corresponding hole and avoid overtightening Hard Drive Door 1 each Modem to System Board 2 each le M2 x 3 mm Hinges to Bottom Case 5 each Fa M2 5 x 5 mm Display Bezel 6 each fer H M2 5 x 5 mm Rubber Screw Covers 6 each Memory Module Cover 2 captive screws 1 each NOTE The single screw is one of the five keyboard SCrews M2 5x 12 mm Keyboard to Bottom Case 5 each M2 5 x 12 mm Display Feed Flex Cable 4 each Display Panel to Top Cover 5 each Im Me x 4 mm Display Latch Palm Rest to Bottom Case 2 each 2 each 3 each 5 each H M25x5mm MI7x35mm M25xi mm MZ x 3 mm Hybrid Cooling Fan System Board to Bottom Case 2 each 1 each 10 each H H M2 5 x 5 mm MZ x 3 mm M2 5 x 5 mm Back to Contents Page Back to Contents Page System Components Dell Latitude C540 C640 Service Manual 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 2 center control cover 11 memory module cover 3 microprocessor thermal cooling 12 module bay assembly device 6 system bora 15 tt speaker 8 mod
17. eld to the battery tray 2 Remove the backing from the adhesive on the bottom of the reserve battery and press the battery into place in the battery tray 3 Update the BIOS using a flash BIOS update floppy disk or CD For instructions on how to flash the BIOS see Flashing the BIOS Back to Contents Page Back to Contents Page Flashing the BIOS Dell Latitude C540 C640 Service Manual To update the basic input output system BIOS 1 Ensure that the AC adapter is plugged in and that the main battery is installed properly 2 Turn on the computer and press to enter the system setup program 3 Reset the boot sequence to boot first from the floppy drive or the CD drive depending on whether your flash BIOS update is supplied on floppy disk or CD 4 Insert the flash BIOS update floppy disk or CD and reboot the computer The computer updates the BIOS and then automatically reboots 5 Immediately press to enter the system setup program and reset the boot sequence to the normal setting Then exit the system setup program 6 Remove the flash BIOS update floppy disk or CD Back to Contents Page Back to Contents Page Speaker Assemblies Dell Latitude C540 C640 Service Manual Removing the Speaker Assemblies NOTI CE Disconnect the computer and any attached devices from electrical outlets and remove any installed batteries NOTI CE To avoid ESD ground yourself by using a wrist grounding strap or
18. em and network adapter 17 keyboard connector cover femsa O Back to Contents Page Back to Contents Page Hard Drive Dell Latitude C540 C640 Service Manual Removing the Hard Drive 1 Save and close any open files exit any open programs and then shut down the computer NOTI CE Disconnect the computer and any attached devices from electrical outlets and remove any installed batteries NOTI CE The hard drive is very sensitive to shock Handle the hard drive by its edges do not squeeze the top of the hard drive case and avoid dropping it NOTI CE Read Preparing to Work Inside the Computer before performing the following procedure NOTICE To prevent data loss turn off your computer before removing the hard drive Do not remove the hard drive while the computer is running in standby mode or in hibernate mode 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 gt 0000 2 Ground yourself by touching a metal connector on the back of the computer UJ Turn the computer over Remove the M3 x 5 mm screw from the hard drive door j 1 bottom of computer 3 hard drive door 4 Lift the hard drive door until you hear a click 5 Slide the hard drive out of the computer Replacing the Hard Drive NOTICE Use firm and even pressure to slide the hard drive into place If you force the hard drive into place u
19. er seating of the microprocessor in the socket press down near the edges of the microprocessor module on the substrate surrounding the die while turning the cam screw NOTICE To avoid damage to the microprocessor hold the screwdriver so that it is perpendicular to the microprocessor when turning the cam screw 008 COO CO 1 screwdriver perpendicular to microprocessor 3 processor die do not touch 4 ZIF socket 5 ZIF socket cam screw 1 Remove the hard drive 2 Remove the keyboard 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 Remove the microprocessor thermal cooling assembly NOTICE When removing the microprocessor module pull the module straight up Be careful not to bend the pins on the microprocessor module To loosen the ZIF socket use a small flat blade screwdriver and rotate the ZIF socket cam screw counter clockwise until it reaches the cam stop The ZIF socket cam screw secures the microprocessor to the system board Take note of the arrow on the ZIF socket cam screw Use a microprocessor extraction tool to remove the microprocessor module Replacing the Microprocessor Module NOTI CE Ensure that the cam lock is in the fully open position before seating the microprocessor module Seating the
20. eries NOTICE To avoid ESD ground yourself by using a wrist grounding strap or by touching an unpainted metal surface on the computer NOTICE Read Preparing to Work Inside the Computer before performing the following procedureDisplay Assembly Remove the hard drive Remove the center control cover Remove the keyboard Close the display From the back of the computer remove the five M2 5 x 5 mm screws labeled circle D Open the display assembly approximately 180 degrees and support the display assembly so that it does not open past this position Remove the two M2 x 3 mm screws on the EMI shield bracket which is attached to the display feed flex cable IENE CC 2 rop cose 3 center contol cover 12 5 semm screws 8 _ 5 bottom case 7 EMI sie brae 8 Remove the two M2 x 3 mm screws that secure the display feed flex cable to the system board NOTICE When reconnecting the display feed flex cable connector to the system board push down on the top left and right ends of the connector Pressing on the center of the connector may damage resistors and compromise EMI protection in the computer M2 x 3 mm screws 2 pull tab 3 display feed cable connector interface connector 9 Pull up on the pull tab that is attached to the display feed flex cable connector to remove it from the interface connector on the system board 10 Pivot the display assembly up to a 90 degree angle and lift it out of the
21. ery Dell Latitude C540 C640 Service Manual Removing the Reserve Battery NOTICE The reserve battery provides power to the computer s RTC and NVRAM when the computer is turned off Removing the battery causes the computer to lose the date and time information as well as all user specified parameters in the BIOS If possible copy the information before you remove the reserve battery 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 touching an unpainted metal surface on the computer NOTICE Read Preparing to Work Inside the Computer before performing the following procedure o ooo 1 Remove the hard drive 2 Remove the keyboard 3 Disconnect the reserve battery cable from the reserve battery connector on the system board 4 Pry the reserve battery free from the EMI shield The reserve battery is attached to the EMI shield with a piece of adhesive tape 5 Remove any remnants of the adhesive tape from the EMI shield 1 reserve battery reserve battery tray reserve battery cable reserve battery connector on system board speaker cables opening for reserve battery cable Replacing the Reserve Battery 1 Connect the reserve battery cable to the reserve battery connector on the system board and then route the battery cable through the opening in the EMI shi
22. he two M2 x 3 mm screws that are located on the back edge of the bottom case underneath the display assembly b Remove the M2 x 3 mm screw located near the right side of the bottom case next to the microprocessor thermal cooling assembly and opposite the S video TV out connector 7 Pull up on the pull tab that is attached to the palm rest flex cable connector to remove it from the interface connector on the system board 5 interface connector for palm rest flex cable back center of the palm rest NOTICE Carefully separate the palm rest from the bottom case to avoid damage to the palm rest 8 Starting at the back center of the palm rest use your fingers to separate the palm rest from the bottom case by lifting the inside of the palm rest while pushing in on the outside Back to Contents Page Back to Contents Page Microprocessor Thermal Cooling Assembly Dell Latitude C540 C640 Service Manual Removing the Microprocessor Thermal Cooling Assembly 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 touching an unpainted metal surface on the computer Q NOTICE Read Preparing to Work Inside the Computer before performing the following procedure 1 Remove the hard drive 2 Remove the kevboard 3 Loosen the four captive screws that secure the microprocessor
23. r when the speaker assembly is installed 2 Place the mounting ring over the front palm rest screw post 3 Slide the speaker assembly down into the bottom case NOTICE Ensure that the speaker wires are routed securely under their mounting clips Back to Contents Page Back to Contents Page System Board Dell Latitude C540 C640 Service Manual Removing the System Board The system board s BIOS chip contains the service tag sequence which is also visible on a bar code label on the bottom of the computer The replacement kit for the system board includes a CD that provides a utility for transferring the service tag sequence to the replacement system board 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 touching an unpainted metal surface on the computer NOTICE Read Preparing to Work Inside the Computer before performing the following procedure 1 Remove the hard drive 2 Remove the keyboard 3 Remove the display assembly 4 Remove the palm rest 5 Remove the microprocessor thermal cooling assembly 6 Remove the microprocessor module 7 Remove the modem memory modules and Mini PCI card 8 From the bottom of the computer remove the six M2 5 x 5 mm screws labeled circle B that secure the system board to the bottom case 9 Remove the three M
24. sing excessive force you may damage the connector 1 Lift the hard drive door until you hear a click Push the hard drive until it is fully seated in the hard drive bay 2 Press the hard drive door down 3 Replace the M3 x 5 mm screw in the hard drive door Back to Contents Page Back to Contents Page Memory Modules Mini PCI Card and Modem Dell Latitude C540 C640 Service Manual Memory Modules Mini PCI Card amp Modem Memory Modules Removing the Memory Module Cover 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 touching an unpainted metal surface on the computer NOTICE Read Preparing to Work Inside the Computer before performing the following procedure 1 Turn the computer over and loosen the two captive screws from the memory module cover 2 Remove the M2 5 x 12 mm screw labeled circle K from the memory module cover This screw is also one of the five keyboard screws 3 Place your finger under the cover at the indentation and lift and slide the cover open M2 5 x 12 mm screw 1 captive screws 2 Removing the 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
25. tch assembly lift it out of the latch holding fixture 1 bumps 2 per latch 5 latch release buttons 2 2 slider J6 snap tabs 2 per latch assembly 3 upper latch assemblies 2 Fi bottom cose fefwr Replacing the Battery and Module Bay Latches 1 If you are replacing the upper latch assembly a Slide the spring onto the slider and install the upper latch assembly in the holding feature on the inside of the bottom case b Ensure that the slider is inserted into the hole that the side of the latch with the two bumps is facing the back of the case and that the side with the wear rib is facing the front of the case Es NOTE The latch will not function properly if the slider is oriented incorrectly 2 Hold down the upper latch assembly and snap in the new latch release button through the bottom case ensuring that the snap tabs are fully engaged in the upper latch assembly 3 Ensure that the newly installed latch release button moves smoothly and freely when pushed and released Back to Contents Page Back to Contents Page Pin Assignments for O Connectors Dell Latitude C540 640 Service Manual USB Connector jajd HHH VCC Parallel Connector e SE dedi Fo de e du SF E 13 12 11 10 9 8 766432 1l 25 24 25 22 21 20 19 18 17 16 15 14 a e E 5 rosmona fis i povesno ju CI CE EE s EM 5 4321 10987 6 o Jenve PS 2 Connector COR E e fesa ooo S Video T
26. thermal cooling assembiv 1 microprocessor thermal cooling assembly captive screws 4 3 right side of thermal cooling assembly 4 recess in EMI shield prying location Insert a screwdriver into the recess in the EMI shield under the front left corner of the thermal cooling assembly and pry the assembly up and out of the system board Replacing the Microprocessor Thermal Cooling Assembly NOTICE To ensure proper thermal operation always install a new compatible thermal cooling assembly along with a new microprocessor 1 Place the right side of the microprocessor thermal cooling assembly under the palm rest and lower the assembly onto the system board 2 Tighten the four captive screws labeled 1 through 4 in consecutive order Back to Contents Page Back to Contents Page Microprocessor Module Dell Latitude C540 C640 Service Manual Removing the Microprocessor Module 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 touching an unpainted metal surface on the computer NOTICE Read Preparing to Work Inside the Computer before performing the following procedure NOTICE To ensure proper thermal operation always install a new compatible thermal cooling assembly along with a new microprocessor NOTICE Do not touch the processor die To ensure prop
27. ved Removing the Mini PCI Card NOTI CE Disconnect the computer and any attached devices from electrical outlets and remove any installed batteries NOTI CE To avoid ESD ground yourself by using a wrist grounding strap or by touching an unpainted metal surface on the computer NOTI CE Read Preparing to Work Inside the Computer before performing the following procedure Remove the memory module cover which also covers the Mini PCI card Disconnect the Mini PCI card from the antenna cables To release a Mini PCI card from its socket spread apart the metal securing tabs until the card pops up slightly Lift the Mini PCI card out of its connector 2 antenna cables 2 Replacing the Mini PCI Card 1 Align the Mini PCI card with the socket at a 45 degree angle and press the Mini PCI card into the socket NOTICE The connectors are keyed for correct insertion do not force the connections 2 Pivot the Mini PCI card down until it snaps into the inner tabs of the socket 3 Attach the antenna cables to the Mini PCI card 4 Replace the memory module cover and tighten the two captive screws Modem Removing the Modem 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 touching an unpainted metal surface on the computer NOTICE Read
28. vers 1 Attach the display assembly to the bottom case 2 Close the display 3 Snap the hinge covers in place over the hinges Es NOTE The right plastic hinge cover label includes an R and the left plastic hinge cover label includes an L The hinge cover labels face the back of the computer right hinge cover left hinge cover Back to Contents Page Back to Contents Page Palm Rest Dell Latitude C540 C640 Service Manual Removing the Palm Rest 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 touching an unpainted metal surface on the computer NOTICE Read Preparing to Work Inside the Computer before performing the following procedure 1 Remove the hard drive 2 Remove the keyboard NOTICE You must remove the display assembly before you remove the palm rest the display hinges pass through the back of the palm rest 3 Remove the display assembly and hinge covers 4 Turn the computer over and remove the three M2 5 x 12 mm screws labeled circle P M2 5 x 12 mm screws 3 M2 x 3 mm screws 2 hard drive bay door 5 Remove the two M2 x 3 mm screws that are located in the hard drive bay door labeled circle P 6 Turn the computer over and remove the three M2 x 3 mm screws that secure the palm rest to the bottom case a Remove t
29. your hand 5 Lay the display panel in the top cover 6 Reinstall the five M2 x 4 mm screws that secure the display panel to the top cover Display Latch 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 touching an unpainted metal surface on the computer Removing the Display Latch 1 Remove the hard drive 2 Remove the display assembly 3 Remove the display bezel 4 Remove the two M2 5 x 5 mm screws and the two M1 7 x 3 5 mm screws that secure the display latch and bracket to the top cover 5 Lift the display latch and bracket out of the top cover XGA Panel Shown Replacing the Display Latch 1 On XGA panels place the display latch on top of its screw holes and then place the bracket on top of the display latch aligning the bracket and display latch screw holes On SXGA panels align the screw holes and place the display latch and attached bracket in the top cover 2 Replace the two M2 5 x 5 mm screws and the two M1 7 x 3 5 mm screws that secure the display latch and bracket to the top cover Hinge Covers Removing the Hinge Covers 1 Remove the display assembly 2 Rotate the hinges forward at an angle of approximately 90 degrees to the front of the display assembly 3 To remove the hinge covers slide them off the hinges Replacing the Hinge Co
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