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# System Board

Dell™ Latitude™ V710/V740 Service Manual

### Removing the System Board

| NOTICE: For V740 only, prior to replacing the system board, ensure that a thermal pad is present on the Memory Controller Hub (MCH) heat-sink, located on the base plastics. If a thermal pad is already present, you do not need to replace it.

The system board's BIOS chip contains the service tag sequence, which is also visible on a barcode 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 optical drive.
3. Remove the floppy drive.
4. Remove the memory module.
5. Remove the modem.
6. Remove the keyboard.
7. Remove the display assembly.
8. Remove the EMI Shield.
9. Remove the video board.
10. Remove the palm rest.
11. Remove the microprocessor thermal-cooling assembly.
12. Remove the microprocessor.
13. Remove the speakers.

1 | floppy drive cage
2 | M2.5 x 5-mm screws (2)
3 | hard drive cage
4 | M2.5 x 5-mm screws (2)

1. Remove the two M2.5 x 5-mm screws that secure the floppy drive cage to the system board, and lift the floppy drive cage out of the bottom case.
2. Remove the two M2.5 x 5-mm screws that secure the hard drive cage to the system board, and lift the hard drive cage out of the bottom case.

1 | battery connector cover
2 | headphone/microphone bridge

1. Remove the battery connector cover by lifting the cover out of the bottom case.
2. Remove the headphone/microphone bridge by lifting the cover out of the bottom case.

1 | M2.5 x 4-mm screws (6)

| NOTE: The M2.5 x 4 screws are silver.

1. Remove the six M2.5 x 4-mm screws labeled "circle L" that secure the system board to the bottom case.

1 | video-connector hex nuts
2 | parallel-connector hex nuts
3 | headphone/microphone flex-panel

1. Remove the two hex nuts that secure the video connector to the bottom case.
2. Remove the two hex nuts that secure the parallel connector to the bottom case.
3. Pull the headphone/microphone flex-panel 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

| NOTICE: For V740 only, prior to replacing the system board, ensure that a thermal pad is present on the Memory Controller Hub (MCH) heat-sink, located on the base plastics. If a thermal pad is already present, you do not need to replace it.

1. Install the replacement system board:
   1. Insert the video connector through the back of the bottom case.
   1. Pull the headphone and microphone flex-panel away from the system board as you simultaneously lower the front of the system board into the bottom case.
   2. Press the flex panel toward the headphone and microphone connectors, and insert the bridge into the bottom case.
   3. Reinstall the two hex nuts that secure the parallel connector to the bottom case.
   4. Reinstall the two hex nuts that secure the video connector to the bottom case.

| NOTICE: Secure the modem-cable grounding terminal to the system board with one of the six M2.5 x 4-mm screws labeled "circle L." Failure to do so may result in damage to the computer.

| NOTE: The M2.5 x 4 screws are silver.

1. Reinstall the six M2.5 x 4-mm screws labeled "circle L," starting on the right side of the bottom case.

1 | modem-cable grounding terminal
2 | M2.5 x 4-mm screws (6)

1. Reinstall the hard drive cage, and reinstall the two M2.5 x 5-mm screws that secure the hard drive cage to the system board.
2. Reinstall the floppy drive cage, and reinstall the two M2.5 x 5-mm screws that secure the floppy drive cage to the system board.

1. Replace the speakers.
2. Replace the microprocessor and the microprocessor thermal-cooling assembly that you removed from the old system board.

| NOTICE: Route cables so that they will not be crimped or pinched when the complete assembly is put back together.

1. Replace the palm rest.
2. Replace the video board and the EMI shield that you removed from the old system board.
3. Replace the display assembly and the keyboard.
4. Replace the floppy drive, optical drive, modem, memory module, and hard drive.
5. If applicable, replace the PC Card in the PC Card slot.
6. Replace the battery.
7. Connect the AC adapter to your computer and to an electrical outlet.

| NOTICE: Before turning on the computer, replace all screws and ensure that no stray screws remain inside the computer. Failure to do so may result in damage to the computer.

1. Turn on the computer.
2. Insert the floppy disk or CD that accompanied the replacement system board into the appropriate drive, and turn on the computer. Follow the instructions on the screen.

| NOTE: After replacing the system board, enter the computer service tag sequence into the BIOS of the replacement system board.

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