Dell Inspiron 4000 Service Manual page 40

Removing the 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 periodically touching an unpainted metal surface on the computer.
NOTICE: Read "Preparing to Work Inside the
1. Remove the hard drive assembly.
2. Turn the computer over and remove the
3. Remove the display assembly.
4. Remove the palm rest assembly.
5. Verify that all PC Cards or plastic blanks are removed from the PC Card slot.
6. Verify that the PC Card ejectors do not extend from the PC Card slot.
7. Turn the computer upside down, and remove the nine M2.5 x 5-mm screws labeled with a "circle B" that secure the system board assembly to the
bottom case assembly:
a. Remove the three M2.5 x 5-mm screws that secure the thermal cooling fan protective cover to the bottom case assembly. The thermal cooling fan
protective cover is located at the back on the right side of the bottom case assembly.
b. Remove the remaining six M2.5 x 5-mm screws from the bottom case assembly.
8. Turn the bottom case assembly right-side up and remove the M2.5 x 5- mm screw labeled with a white circle on the front center of the system board.
9. Remove the speakers from the bottom case assembly.
10. Pull the right side of the bottom case assembly, next to the external headphone and microphone connectors, away from the system board assembly as
you simultaneously lift the front of the system board assembly out and away from the bottom case assembly.
Replacing the System Board
1. Install the microprocessor on the replacement system board.
2. Connect the right and left speaker to the replacement system board.
3. Install the replacement system board:
a. Insert the external microphone and headphone connectors through the plastic bottom case assembly.
b. Replace the nine M2.5 x 5-mm screws, starting on the right side of the bottom case assembly.
c. Replace the thermal cooling fan protective cover, inserting the tab into the bottom case assembly and replacing the three M2 x 4-mm screws. If
you replace the screw opposite the tab first, the other two screws are easier to insert and replace.
HINT: Be sure to route cables so that they will not be crimped or pinched when the complete assembly is put back together.
4. Replace any subassemblies that you may have removed, including the memory modules, PCI card cage, Mini PCI card, speaker modules, thermal cooling
assembly, and hybrid cooling fan.
5. Replace the palm rest assembly, the display assembly, the hard drive, and the keyboard assembly.
6. Replace the modular bay devices and any PC Cards or plastic blanks in the PC Card slot.
Computer" before performing the following procedure.
keyboard assembly.