In the following guide I will explain how to replace broken display hinges on Dell Latitude C640 and Latitude C540 series laptops. Replacing and removing hinges is not a difficult task if you are careful and pay attention to details. I’m not sure if you can use same hinges for both models but the following removal and replacement instructions should be the same for both.
1. Find new replacement hinges.
2. Follow the disassembly instructions below.
Before you start, remove the battery.
Remove five screws securing the keyboard. These screws are marked with a letter K stamped on the base.
Remove five screws securing the display hinges. Three screws on the left side and two screws on the right side.
Carefully lift up and remove the keyboard bezel with a flathead screwdriver or another sharp object.
Lift up and remove both hinge covers.
Lift up the keyboard from the base. Be careful, it is attached to the motherboard via a flat ribbon cable.
Disconnect the cable and remove the keyboard.
The able had been disconnected from the motherboard.
Remove four screws securing the video cable.
Carefully disconnect the video cable from the motherboard by the yellow belt on the connector.
Remove six rubber screw seals with a sharp object. Remove six screws located under these seals.
Insert your fingers between the display bezel and the LCD panel and carefully separate the bezel from the display.
Keep separating the bezel from the display with your fingers until you can remove it.
Remove two screws securing the LCD panel to the display hinges. You’ll find two screws on each side of the screen.
Remove the LCD from the display cover. Be careful it is attached to the video cable.
Unplug the video cable from back (Green Arrow).
Unplug the video cable from the inverter board (Red Arrow).
Remove the screen.
Now you can remove two screws securing both display hinges.
Remove both hinges from the display cover. Replace both hinges, or just the broken one.