HP Omnibook 900 Service Manual

							HP OmniBook 900 Removal and Replacement 2-11
 7. For a 12-inch display, remove the LCD module.
  a. Remove the four screws holding the LCD module.
  b. Lift up the right edge of the LCD module about 90°.
  c. Using a small flat-blade screwdriver, insert the tip under the narrow end of the flex cable
connector—not the wide end—and twist the screwdriver to release the connector from the
LCD module.
 8. For a 13-inch display, remove the LCD module.
  a. Close, but don’t latch the display; then lift off the display case.
  b. Loosen and then pull the flex cable out of the connector.
  c. Remove four screws, two each, on the right and left edges of the LCD module.
 
 
 Figure 2-6. Removing the LCD Module
Bumper (oval)
Screw cover
Screw, M2.5×5mmScrew, M3×4mm
LCD flex cable
LCD module
Display case
Power cable
Bezel
Note: 12-inch display
shown. For a 13-inch
display, the flex cable
and mountings differ. 
						

							2-12 Removal and Replacement HP OmniBook 900
Reassembly Notes
 · For the 12-inch display, make sure the LCD module and flex cable have small foam pads present
to ensure good connections:
  Two pads on the back of the LCD module on the internal connections near the top-left and
bottom-left corners. If a pad is missing, replace the LCD module.
  One pad on the LCD flex cable behind the connector that plugs into the LCD module. If the
pad is missing, replace the flex cable.
 · For the 13-inch display, make sure the power wire is return to its original position. Where the
wire passes around the hinge cover opening, it tucks behind the LCD module.
Removing the Keyboard
(HP Authorized Service Providers Only)
Required Equipment
 · Small Phillips screwdriver.
 · Probe or tweezers.
Removal Procedure
 1. Unplug the ac adapter, if present, and remove the battery.
 2. Put your finger above the F8 key and slide the keyboard-screw cover to the left about 3 mm
(1/8 inch)—then lift off the cover.
 3. Remove the two screws holding the keyboard above the F1 and HOME keys. If your screwdriver
has a fat shaft, protect or remove the right hinge cover.
 4. Lift up the keyboard tab above the F1 key about 10 mm (1/2 inch). If necessary, free the snap at
the center of the back edge near the F8 key.
 5. Slide the keyboard toward the display about 5 mm (1/4 inch), then fold the keyboard forward onto
the front of the top case.
  Warning
 
Do not touch the heatsink until it has cooled. It could be hot if the computer was running recently.
 6. Release the pointing stick flex cable from the motherboard.
 7. Release the keyboard flex cable from the motherboard, then remove the keyboard. 
						

							HP OmniBook 900 Removal and Replacement 2-13
 
 
 Figure 2-7. Removing the Keyboard
Reassembly Notes
 · To connect the flex cables, lay the keyboard upside-down on the front section of the top case.
 · Fold the keyboard back into place. Slip its front tabs into the slots, then snap the back edge into
place.
 · Push the keyboard toward the back as you tighten the two screws. This helps engage the tab at the
back-center of the keyboard.
Keyboard
Keyboard-screw
cover
Screw, M2.5×4mm
Keyboard flex cable
Pointing stick flex cable 
						

							2-14 Removal and Replacement HP OmniBook 900
Removing the CPU Module
(HP Authorized Service Providers Only)
Required Equipment
 · Small Phillips screwdriver.
 · Small plastic blade for prying, such as an angled plastic tweezers (OmniBook 900† only).
 · Small flat-blade screwdriver: 4.0-4.5 mm blade (OmniBook 900B only).
Removal Procedure
 
Warning
 
Do not touch the heatsink until it has cooled. It could be hot if the computer was running recently.
 1. Unplug the ac adapter, if present, and remove the battery.
 2. Remove the keyboard (page 2-12)—but you don’t have to release the flex cables.
 3. Remove the eight screws (OmniBook 900†) or six screws and springs (OmniBook 900B) from
the heatsink and lift off the heatsink.
  Caution
 
Do not spin the fan blade with your finger. Pressure on the fan blade can damage the bearings.
 
 
Caution: OmniBook 900†
 
Follow these precautions to prevent damage to the CPU connector:
 ·  Use only a non-metallic tool for releasing the CPU module. A metal tool may damage the
motherboard.
 
 ·  Do not raise the front end or the CPU module higher than the back end during removal.
 
To reinstall the CPU assembly, see the precautions under “Reassembly Notes.”
 4. For an OmniBook 900†, to release the CPU module, at the side of the CPU module near the
back-right corner, pry up the corner of the CPU module about 1-2 mm. Then pry up the back-left
corner. Lift off the CPU module.
Pry up at these two
places. 
						

							HP OmniBook 900 Removal and Replacement 2-15
  Caution: OmniBook 900B
 
Follow these precautions to prevent damage to the CPU connector:
 ·  Use only a 4.0-4.5 mm flat-blade screwdriver to release the CPU.
 ·  Use only enough force to lock the CPU module. The CPU connector may be damaged if too
much force is used.
 
To reinstall the CPU assembly, see the precautions under “Reassembly Notes.”
 5. For the OmniBook 900B, insert the flat-blade screwdriver into the release slot of the CPU
socket, and then turn the screwdriver counter-clockwise (approximately 10 degrees) until the CPU
module is free.
 
 
 Figure 2-8. Removing the CPU Module
Reassembly Notes
  Caution: OmniBook 900†
 
Follow these precautions while installing the CPU module to prevent damage to the CPU
connector:
 ·  Place the CPU module on the connector carefully. Use the screw holes as a guide.
 ·  Place your fingers on top of the CPU module above the left and right ends of the connector.
Do not push at other locations.
 · Press firmly at the left end while holding down the right—until the left engages. Then press
down the right down while holding the left.
 ·  Press firmly until the CPU module seats in the connector—you should feel a slight click.
 
Install or replace thermal pads on the heatsink that are missing or damaged.
 
Do not install screws in the middle area of the heatsink. The only screws in the CPU area are at
the four corners of the CPU module.
Heatsink
(OmniBook 900†
)
CPU module
CPU connector
Note: Do not put screws
in these two holes.Screw, M2×5mm (8)
Heatsink
(OmniBook 900B
)
Screw, M2×5mm (6)
Spring
(insert
under heatpipe)
Note: OmniBook 900† CPU
module and motherboard
shown. Details differ for
OmniBook 900B. 
						

							2-16 Removal and Replacement HP OmniBook 900
  Caution: OmniBook 900B
 
Follow these precautions while installing the CPU module to prevent damage to the CPU
connector:
 ·  Place the CPU module on the connector carefully. Align the arrow on the upper right corner of
the CPU module with the matching arrow on the connector.
 ·  Use only a 4.0-4.5 mm flat-blade screwdriver to lock the CPU module.
 ·  Use only enough force to lock the CPU module. The CPU connector may be damaged if too
much force is used.
 
Install or replace thermal pads on the heatsink that are missing or damaged.
Removing the Display Assembly
(HP Authorized Service Providers Only)
Required Equipment
 · Small Phillips screwdriver.
Removal Procedure
 1. Unplug the ac adapter, if present, and remove the battery.
 2. Remove the keyboard (page 2-12).
 3. Open the display fully and remove the covers from the display hinges. Push in at the bottom-front
of the covers.
 4. Unplug the display power wires from the motherboard near the right hinge. Free the wires from
the notch in the top case.
 5. Remove the two screws from the end of the LCD flex cable and unplug the cable from the
motherboard.
 6. Close the display and turn over the computer.
 7. Remove the two screws from the back corners of the bottom case.
 8. Open the display about 90°, then lift if off. 
						

							HP OmniBook 900 Removal and Replacement 2-17
 
 
 Figure 2-9. Removing the Display Assembly
Reassembly Notes
 · For a 12-inch display, the flex cable wraps around the post only about 1/2 turn.
 · For a 12- or 13-inch display, insert the display power wires into the notch in the top case before
installing the hinge cover.
Hinge covers (2)
Display power cable
Screw, M2.5×4mm
Display flex cable
Screw, M2.5×8mm 
						

							2-18 Removal and Replacement HP OmniBook 900
Removing the Top Case
(HP Authorized Service Providers Only)
Required Equipment
 · Small Phillips screwdriver.
Removal Procedure
 1. Unplug the ac adapter, if present, and remove the battery.
 2. Remove these additional assemblies:
 · Hard disk drive (page 2-6)
 · Keyboard (page 2-12).
 · Display assembly (page 2-16).
 3. Remove the eight screws (OmniBook 900†) or six screws and two springs (OmniBook 900B)
from the heatsink and lift off the heatsink.
  Caution
 
Do not spin the fan blade with your finger. Pressure on the fan blade can damage the bearings.
 4. Unplug the microphone cable from the motherboard near the back.
 5. Unplug the touch pad flex cable from the motherboard near the front.
 6. On the bottom of the unit, remove the five screws (12-inch display) or six screws (13-inch
display) from the front half of the case.
 7. On the top of the unit, remove the three screws along the back of the top case.
 8. Remove the six screws (12-inch display) or five screws (13-inch display) holding the top case to
the motherboard and bottom case.
 9. Near the docking connector, press down on the inner edge of the top case and lift the back edge
until two snaps release in that area.
 10. Near the right hinge area, push the top case toward the rear and lift the back edge until the top
case releases from the right hinge support.
 11. Hold the front of the bottom case with your thumbs. Lift the back of the top case about 5 mm
(2 inches), then pull it forward with your fingers. Pull and work the top case until the middle snap
releases.
 The left hinge support comes off with the top case. The right hinge support stays in the bottom
case. 
						

							HP OmniBook 900 Removal and Replacement 2-19
 
 
 Figure 2-10. Removing the Top Case
Reassembly Notes
  Note: Installing a New Top Case
 ·  Transfer the following items from the old top case to the new one:
 
Touch pad and support.
 
Left hinge support.
 ·  Press down on the touch pad support plate while sliding it into place. Make sure the support is
held down at its left and right edges. Check the action of the click buttons before installing the
top case.
 · Engage the tab at the front of the top case, then lower the top case onto the bottom case.
 · It may be easier to plug in the touch pad flex cable while you are lowering the top case onto the
bottom case—rather than waiting until after the top case is fully installed.
Top case
Microphone cable
Touch pad cable
Heatsink
Screw, M2.5×8mm
Screw, M2.5×5mm
               13-inch
               display only
Screw, M2.5×8mm
Screw, M2.5×5mm
Screw, M2×5mm
8-OmniBook 900
†,
6-OmniBook 900B
Note: Do not put screws
in these two holes.
12 inch
display only
Note: OmniBook 900†
heatsink shown. For the
OmniBook 900B, the
heatsink and mounting
differ. Note: On recent units,
a HDD bracket is
installed in this area. 
						

							2-20 Removal and Replacement HP OmniBook 900
  Note
 
For an OmniBook 900 with a 12-inch display and serial number before TW 92500000, if the top
case has been damaged by excessive pressure above the hard disk slot, check whether you must
replace additional parts:
 ·  If the bottom case has a large blue pad that covers the bottom of the hard disk slot, and if the
hard disk slot has a metal bracket across the top of the slot, replace just the top case.
 ·  If the bottom case has such a pad in the hard disk slot, but there is no metal bracket across
the top of the slot, you should also install a HDD bracket above the hard disk slot.
 ·  If the bottom case does not have such a pad in the hard disk slot, it is an old bottom case,
and you should also replace the bottom case and install a HDD bracket above the hard disk
slot. (Service note 900-14.)
Removing the Motherboard or Bottom Case
(HP Authorized Service Providers Only)
 
Exchange Information
 
W hen returning a bad motherboard to HP, describe the symptoms on a piece of paper and attach
it to the part—do not use tape.
Required Equipment
 · Small Phillips screwdriver.
 · 4-mm thin-wall hex driver (or 5/32 inch). If necessary, grind the sides of a standard driver.
Removal Procedure
 1. Unplug the ac adapter, if present, and remove the battery.
 2. Remove these additional assemblies:
 · Hard disk drive (page 2-6).
 · Keyboard (page 2-12).
 · Display assembly (page 2-16).
 · CPU module (page 2-14).
 · Top case (page 2-18).
 3. Remove the screw holding the right hinge support near the back-right corner, then lift out the
support.
 4. Remove the screw holding the front-left corner of the motherboard.
 5. Unplug the speaker wire from the front of the motherboard.
 6. Unplug the fan wire from the left side of the motherboard.
 7. Remove the two screws from the PCMCIA socket.
 8. Unplug the PCMCIA socket flex cable from the motherboard and lift out the socket.
 9. Remove the four hex standoffs in the CPU area.