Caution

In the next step, follow these precautions to prevent damage to the CPU connectors:

∙Do not raise the left end higher than the right end during removal.

∙OmniBook 4150B: Insert a flat, non-metallic blade under the front of the CPU module near the right end. Pry up against the motherboard until the CPU releases. Repeat at the back edge, then lift off the module.

∙OmniBook 4150†: Use the CPU removal tool to remove the CPU assembly.

a.Hold the tool so the large notch is toward the front of the computer.

b.Hold the hooked arm of the tool just to the right edge of the right tab on the top plate. If the top plate has been removed, hold the arm about 4 mm (1/8 inch) to the right of the hook on the bottom plate.

c.Hook the hooked arm under the lower-back edge of the CPU assembly (#1) next to the right tab.

d.Lower the front arm of the tool so it straddles the connector housing on the motherboard (#2).

e.Pull the tool handle toward the front to lift out the assembly (#3). Then remove the tool from the assembly.

The arm lines up with the right edge of the tab.

The notch fits over the plastic connector housing.

Figure 2-9. Removing the CPU (OmniBook 4150†)

∙OmniBook 4100: To remove the CPU assembly, lift firmly on the back edge of the bottom plate near the right corner. This requires firm force. After the back edge releases, lift off the assembly.

To reinstall the CPU assembly, see the precautions under “Reassembly Notes.”

6.Remove the complete CPU assembly so it unplugs from the motherboard—see the caution above.

7.If necessary, slide off the top plate, then remove the CPU module from the bottom plate.

Note

For an OmniBook 4100 with a serial number below TW84099999, if the CPU bottom plate has a revision number less than “Rev 4”, replace the bottom plate with one that is “Rev 4” or higher. (Service note 4100-03.)

HP OmniBook 4100/4150

Removal and Replacement 2-21