Page 2 - Before You Begin; Preparing to Work Inside the Computer
Back to Contents Page Before You Begin Dell™ Latitude™ C540/C640 Service Manual Preparing to Work Inside the Computer Recommended Tools Screw Identification Preparing to Work Inside the Computer CAUTION: Before working inside your computer, read the safety instructions in your System Information Gui...
Page 3 - Recommended Tools; Screw Identification
Recommended Tools The procedures in this manual require the following tools: #1 magnetized Phillips screwdriver ¼-inch flat-blade screwdriver Small plastic scribe Microprocessor extractor Flash BIOS update program floppy disk or CD. Computer Orientation 1 back 2 right 3 front 4 left Screw Identifica...
Page 6 - System Components
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...
Page 8 - Hard Drive; Removing the Hard Drive
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. NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batt...
Page 9 - Replacing the Hard Drive
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 using 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 dri...
Page 10 - Memory Modules; Removing the Memory Module Cover; Removing the Memory Modules
Back to Contents Page Memory Modules, Mini PCI Card, and Modem Dell™ Latitude™ C540/C640 Service Manual Memory Modules Mini PCI Card Modem Memory Modules Removing the Memory Module Cover NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batter...
Page 11 - Replacing 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 by touching an unpainted metal surface on the computer. NOTICE: Read " Preparing to Work Inside the Comp...
Page 12 - Mini PCI Card; Removing the Mini PCI Card
NOTE: Memory modules are keyed, or designed to fit into their sockets, in only one direction. NOTICE: The memory module must be inserted at a 45 -degree angle to avoid damaging the connector. 2. Align the notch in the memory-module edge connector with the tab in the socket. 3. Slide the edge connect...
Page 13 - Replacing the Mini PCI Card; Modem; Removing the Modem
1 antenna connectors on card (2) 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...
Page 14 - Replacing the Modem
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. 1 M2 x 3-mm screws (2) 2 modem connector 3 modem cable 4 pull-tab Rep...
Page 15 - Keyboard; Removing the Keyboard
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...
Page 17 - Replacing the Keyboard
1 boss supports (5) 2 track stick cable 3 keyboard flex cable 4 keyboard interface 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 th...
Page 19 - Display Assembly, Display Latch, and Hinge Covers; Display Assembly
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 NOTICE: You must remove the display assembly before you remove the palm rest. NOTICE: Disconnect the computer and any attached...
Page 22 - Removing the Display Bezel
1 rubber screw covers (6) 5 M2 x 4-mm screws (5) 2 M2.5 x 5-mm screws (6) 6 display -feed flex cable 3 display bezel 7 flex-cable retention bracket 4 top cover 8 display panel Removing the Display Bezel NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any ...
Page 23 - Removing the Display Panel
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. NOTICE: Carefully separate the bezel from the top cover to avoid damage to the...
Page 24 - Replacing the Display Panel; Display Latch
1 display panel connector 2 top flex cable connector 3 pull-tab 4 bottom flex cable connector 5 inverter 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 conne...
Page 25 - Removing the Display Latch; Replacing the 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 ...
Page 26 - Hinge Covers; Removing the Hinge Covers; Replacing the Hinge Covers
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 Covers 1. Attach the display assembly to th...
Page 28 - Palm Rest; Removing the Palm Rest
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 ...
Page 30 - Microprocessor Thermal Cooling Assembly; Removing the Microprocessor Thermal Cooling Assembly
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, grou...
Page 31 - Replacing the Microprocessor Thermal Cooling Assembly
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 ...
Page 32 - Microprocessor Module; Removing the Microprocessor Module
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 groundi...
Page 33 - Replacing the Microprocessor Module
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. 3. Remove the microprocessor thermal cooling assembly . NOTICE: When removing ...
Page 34 - Hybrid Cooling Fan; Removing the Hybrid Cooling Fan
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 str...
Page 36 - Reserve Battery; Removing the Reserve Battery
Back to Contents Page Reserve Battery 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 we...
Page 37 - Replacing the Reserve Battery
2 reserve battery tray 3 reserve battery cable 4 reserve battery connector on system board 5 speaker cables 6 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 thr...
Page 38 - Flashing the BIOS
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 ...
Page 39 - Speaker Assemblies; Removing the Speaker Assemblies
Back to Contents Page Speaker Assemblies Dell™ Latitude™ C540/C640 Service Manual Removing the Speaker Assemblies 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 str...
Page 42 - Replacing the Speaker Assemblies
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...
Page 43 - System Board; Removing the System Board
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 p...
Page 45 - Replacing the System Board
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 micropr...
Page 46 - Battery and Module Bay Latches; Removing the Battery and Module Bay Latches
Back to Contents Page Battery and Module Bay Latches Dell™ Latitude™ C540/C640 Service Manual Removing the Battery and Module Bay Latches NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batteries. NOTICE: To avoid ESD, ground yourself by usi...
Page 47 - Replacing the Battery and Module Bay Latches
1 bumps (2 per latch) 5 latch release buttons (2) 2 slider 6 snap tabs (2 per latch assembly) 3 spring 7 upper latch assemblies (2) 4 bottom case 8 wear rib Replacing the Battery and Module Bay Latches 1. If you are replacing the upper latch assembly: a . Slide the spring onto the slider, and instal...
Page 48 - Pin Assignments for I/O Connectors; USB Connector
Back to Contents Page Pin Assignments for I/O Connectors Dell™ Latitude™ C540/640 Service Manual USB Connector Pin Signal 1 VCC 2 –Data 3 +Data 4 Ground Serial Connector Pin Signal Pin Signal 1 DCD 6 DSR 2 RXDA 7 RTS 3 TXDA 8 CTS 4 DTR 9 RI 5 GND Parallel Connector
Page 49 - Video Connector
Pin Signal Pin Signal 1 STRB#/5V 11 BUSY/MTR# 2 PD0/INDEX# 12 PE/WDATA# 3 PD1/TRK0# 13 SLCT/WGATE# 4 PD2/WP# 14 AFDF# 5 PD3/RDATA# 15 ERROR#HDSEL# 6 PD4/DSKCHG# 16 INIT#/DIR# 7 PD5F 17 SLCT_IN#STEP# 8 PD6F 18–23 GND 9 PD7F 24 DFDD/LPT# 10 ACK#/DRV# 25 GND Video Connector Pin Signal Pin Signal 1 RED ...
Page 51 - Docking Connector
5 NC 6 DCMPS -L 7 GND Docking Connector Pin Signal Pin Signal 1 STRB#/5V 101 VGA_GRN 2 PD0 102 GND 3 PD1 103 VGA_RED 4 PD2 104 GND 5 PD3 105 VGA_BLU 6 PD4 106 DOCK_SD/MODE 7 PD5 107 D_IRTX 8 PD6 108 D_IRRX 9 PD7 109 GND 10 GND 110 SPIRQB# 11 DOCK_SPKR 111 SPIRQC# 12 DOCK_MIC 112 DAT_DDC2 13 DOCK_LIN...
