Table 2-11. Removing Bottom Case Components

Component

Air Vent Cover

Audio Jack Cover

Audio Jack PCA

Removal Procedures

Plug-in module (page 2-3). Hard drive (page 2-5). Keyboard (page 2-9). Display (page 2-11).

Top case (page 2-16).

Plug-in module (page 2-3). Hard drive (page 2-5). Keyboard (page 2-9). Display (page 2-11).

Top case (page 2-16).

Plug-in module (page 2-3). Hard drive (page 2-5). Keyboard (page 2-9). Display (page 2-11).

Top case (page 2-16).

Additional Steps (See figures on pages 4-2, 4-8)

1.Remove the screw from the plastic heat exchange cover and remove the cover.

2.Lift off the fan and move it aside.

3.For a 2-screw CPU top plate, remove the screw from the heatsink cover and remove the cover.

4.Remove the 2 or 5 screws from the CPU top plate and remove the plate.

5.Remove the screw holding the left frame to the motherboard and lift off the frame.

6.Lift out the air vent cover.

1.Remove the screw from the IR PCA and move the PCA aside.

2.Remove the two screws from the right frame and remove the frame.

3.Lift the front-right corner of the motherboard slightly and remove the audio jack cover.

1.Remove the screw from the IR PCA and move the PCA aside.

2.Remove the two screws from the right frame and remove the frame.

3.Unplug the DC-DC PCA.

4.Unplug the audio jack PCA.

During installation, the metal shield goes under the motherboard.

BIOS IC

Bottom Case

CPU Bottom Plate

CPU Module (MMO)

CPU Top Plate

Note: For the OmniBook 4150B, see “Heatsink/Top Plate” below.

See page 2-28.

See page 2-19.

Keyboard (page 2-9). CPU module (page 2-13).

See page 2-13.

Keyboard (page 2-9).

Reassembly Notes: For an OmniBook with a 2-screw top plate, assemble the CPU module, top plate, and bottom plate before installing them on the motherboard.

For an OmniBook 4150† with a 5-screw top plate, assemble the only CPU module and bottom plate before installing them on the motherboard.

1.For an OmniBook 4150† with a 2-screw top plate, remove the screw from the heatsink cover and lift it off the heatpipe.

2.Remove the 2 or 5 screws holding the CPU top plate.

3.Remove the top plate.

Caution: Replace the top plate with one that is compatible with the CPU module—see the table on page 4-3.

Caution: Install conductive tape grounding straps and conductive pads on top of the top plate—just as on the original top plate.

Caution: For an OmniBook 4100, install a square top- plate spacer on top of the top plate at the right-rear corner. (Service note 4100-03C.)

HP OmniBook 4100/4150

Removal and Replacement 2-33