HP OMNIBOOK 4100 Service Manual page 57

Component
DC-DC PCA
Fan
Caution: Do not spin
the fan blade with your
finger. Pressure on the
fan blade can damage
the bearings.
Frame, Left
Frame, Left or Right
Heatsink Parts
(OmniBook 4100/4150†)
Caution: For the
OmniBook 4100, the
finned heatsink and
heatsink cover must
match the screw size
(M2 or M3).
Heatsink/Top Plate
(OmniBook 4150B)
IR PCA
LVDS PCA
(not present in
OmniBook 4150B)
2-34 Removal and Replacement
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).
Keyboard (page 2-9).
Display (page 2-11).
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).
Keyboard (page 2-9).
Display (page 2-11).
Keyboard (page 2-9).
Display (page 2-11).
Keyboard (page 2-9).
Display (page 2-11).
Additional Steps (See figures on pages 4-2, 4-8)
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.
1. Unplug the fan cable from the motherboard.
2. Remove the screw from the plastic cover. On an
OmniBook 4150B, remove the other screw holding
the fan.
3. Lift out the cover and fan - they are a single
assembly on an OmniBook 4150B.
Reassembly Notes: For an OmniBook 4100 or 4150†,
route the fan wires at the bottom of the opening next to
the motherboard.
1. Remove the 1 or 2 screws holding the heat
exchange cover/fan.
2. Lift off the cover/fan and move them 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 top plate.
5. Remove the screw holding the frame to the
motherboard and remove the frame.
1. Remove the screw holding the IR PCA to the frame
and move the PCA aside.
2. Remove the two screws holding the frame and
remove the frame.
Heat exchange cover: Remove the screw from the
plastic cover and remove it from the frame.
Heatsink cover (present only on an OmniBook with a
2-screw CPU top plate): Remove the screw from the
cover and remove it from the heatpipe.
Finned heatsink: Remove the top case (page 2-16).
Remove the screw holding the heat exchange cover
to the frame and remove the cover. Lift off the fan
and move it aside. For a 2-screw CPU top plate,
remove the screw and heatsink cover. Remove the 2
or 5 screws from the CPU top plate and remove the
top plate. Remove the screw from the left frame and
lift off the frame. Then lift out the finned heatsink.
Remove the 5 screws from the heatsink/top plate and
lift it off.
Remove the screw from the IR PCA, then unplug the
cable from the motherboard.
Use a probe to unplug the LVDS PCA from the VGA
PCA.
Caution: The LVDS PCA must be compatible with the
LCD module. See the compatibility table on page
2-13.
HP OmniBook 4100/4150