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.

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.

Q 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 keyboard is correctly installed. The keys should be flush with the left and right surfaces of the palm rest.

5. Replace the center control cover, close the display assembly, and then turn the computer over.

6. Reinstall the five M2.5 x 12-mm screws in the holes labeled "circle K."

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Display Assembly, Display Latch, and Hinge Covers

Dell™ Latitude™ C540/C640 Service Manual

■J Display Assembly ■J Display Latch ■J Hinge Covers

Display Assembly

Q NOTICE: You must remove the display assembly before you remove the palm rest.

(J) NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batteries.

Q 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 procedureDisplay Assembly

1. Remove the hard drive.

2. Remove the center control cover.

3. Remove the keyboard.

4. Close the display.

5. From the back of the computer, remove the five M2.5 x 5-mm screws labeled "circle D."

6. Open the display assembly approximately 180 degrees and support the display assembly so that it does not open past this position.

7. Remove the two M2 x 3-mm screws on the EMI shield bracket, which is attached to the display-feed flex cable.

1

M2 x 3-mm screws (2)

2

top cover

3

center control cover

4

M2.5 x 5-mm screws (5)

5

bottom case

6

display-feed flex cable

7

EMI shield bracket

8. Remove the two M2 x 3-mm screws that secure the display-feed flex cable to the system board.

Q 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.

1

M2 x 3-mm screws (2)

2

pull-tab

3

display-feed cable connector

4

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 bottom case.

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

(J) NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batteries.

Q 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 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.

(J) 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 NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batteries.

Q 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 display assembly.

3. Remove the display bezel.

4. Remove the hinge covers.

5. 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.

Xa 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.

6. Remove the M2 x 4-mm screw that secures the display-feed flex cable through the black plastic flex-cable retention bracket.

7. Lift from the top and rotate the display panel out of the top cover.

8. Disconnect the bottom flex cable connector from the inverter connector by pulling straight up on the attached pull-tab.

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 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 with 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

1

M1.7 x 3.5-mm screws (2)

2

M2.5 x 5-mm screws (2)

3

display latch

4

bracket

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 Covers

1. Attach the display assembly to the bottom case.

2. Close the display.

3. Snap the hinge covers in place over the hinges.

Xa 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.

1

right hinge cover

2

left hinge cover

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The Ultimate Computer Repair Guide

The Ultimate Computer Repair Guide

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