Reassembly Notes

∙For an OmniBook 4100 or 4150†, before installing the CPU module, assemble it into the bottom plate. For a 2-screw CPU top plate, attach the top plate to the assembly—do not attach a 5-screw top plate before installing the assembly. Then install the assembly on the motherboard. See the following caution.

Caution

Install or replace CPU module thermal pads that are missing or damaged. Do not reuse a notched CPU pad on a new CPU module. See the figure following this caution.

∙OmniBook 4150B: Align the front-right corner of the CPU module and gently lower it onto the connector. Press down on the CPU module until it seats, as described below.

∙OmniBook 4150†: Carefully remove the CPU assembly—the contacts on the CPU connectors are easily damaged.

a.Align the front-right corner of the CPU assembly correctly and gently lower the assembly onto the connector.

b.Place your fingers on top of the CPU assembly above the front and back ends of the connector (#2 and #1). Do not push at other locations.

c.Press firmly at the back end (#1) while holding down the front—until the back engages.

d.Then press down the front down (#2) while holding the back.

e.Press firmly until the CPU assembly seats in the connector—you should feel a slight click.

Hold both edges. Push down one edge at a time.

Figure 2-10. Inserting the CPU (OmniBook 4100/4150†)

∙OmniBook 4100: Keep the CPU assembly flat while installing it. Press it down above the connectors at the right end. Otherwise, you could damage the connectors.

Before installing the screws, make sure the CPU assembly is fully seated so the bottom plate is touching the motherboard. Otherwise, you could strip the screws.

Install the two screws in diagonally opposite corners of the top plate.

∙For an OmniBook 4150† with a 5-screw CPU top plate, install the top plate after installing the bottom plate and CPU. The tab on the top plate heatpipe must first be slipped into a slot under the fan cover, as the top plate is lowered into position on the CPU.

∙If you removed conductive tape grounding straps from the CPU top plate, install them again.

2-22 Removal and Replacement

HP OmniBook 4100/4150