HP Omnibook 900 Service Manual

							HP OmniBook 900 Removal and Replacement 2-1
2 
Removal and Replacement
This chapter tells you how to remove and replace the following components and assemblies. The ones
marked by 
· are user-replaceable.
 Table 2-1. Removal Cross-Reference
 
· Battery (page 2-3)
 Bezel, display (page 2-27)
· Bumper, display (page 2-9)
 Cable, display flex (page 2-27)
 Cable, display power (page 2-27)
· Cap, pointing stick (page 2-9)
 Case, bottom (page 2-20)
 Case, display (page 2-27)
· Case, HDD kit (page 2-6)
 Case, top (page 2-18)
· Cover, display screw (page 2-9)
· Cover, hinge (page 2-9)
· Cover, keyboard screw (page 2-9)
 CPU module (page 2-14)
· Door, HDD (page 2-9)
 Door, module bay connector (table starting on
page 2-28)
· Drive, hard disk (page 2-6)
 Fan (table starting on page 2-28)
  
· Foot (page 2-9)
 Heatsink (table starting on page 2-28)
 Hinge, display (page 2-27)
 IC, BIOS (page 2-24)
 Insulator, bottom case (table starting on
page 2-28)
 Keyboard (page 2-12)
 Latch, display (page 2-27)
 LCD module (page 2-10)
 Lens, infrared (table starting on page 2-28)
 Overlay, serial number (page 2-23)
 Pads, thermal (table starting on page 2-28)
 PCA, motherboard (page 2-20)
 Socket, PCMCIA (table starting on page 2-28)
 Speaker (table starting on page 2-28)
 Support, hinge left (table starting on page 2-28)
 Support, hinge right (table starting on
page 2-28)
 Support, touch-pad (page 2-28)
 Touch pad (page 2-28)
 
  Caution
 
Always provide proper grounding when performing repairs. W ithout proper
grounding, an electrostatic discharge may damage the OmniBook and its
components. 
						

							2-2 Removal and Replacement HP OmniBook 900
  Notes
 
Reassembly steps are the reverse of the removal steps. Reassembly notes are included at the
end of each section below.
 
Symbols like this throughout this chapter show approximate full-size screw outlines. You
can use them to verify the sizes of screws before you install them. Installing a wrong-size screw
can damage the unit. (The symbol at the left represents an M2.5×5mm T-head screw.)
 Table 2-2. Required Equipment
 · Small Phillips screwdriver (#1), preferably magnetized.
 · Fine Phillips screwdriver (#0).
 · 4-mm thin-wall hex driver (or 5/32 inch).
 · Small plastic blade for prying, such as an angled plastic tweezers.
 · Pointed knife or probe.
 · Small flat-blade screwdriver.
 · 4.0-4.5 mm flat-blade screwdriver.
 · IC (PLCC) removal tool (similar to OK Industries EX-5).
 Table 2-3. Recommended Screw Torques
Screw Thread SizeTorque (kgf•cm)Torque (lbf•in)
M1.40.9 – 1.2 0.8 – 1.0
M21.5 – 2.0 1.3 – 1.7
M2.5 (4–5 mm long)
except those in next line3.0 – 3.5 2.6 – 3.0
M2.5 (4–5 mm long)
for HDD case, PCMCIA socket2.0 – 2.5 1.7 – 2.2
M2.5 (8 mm long)3.5 – 4.0 3.0 – 3.4
M3
except those in next line4.0 – 4.5 3.4 – 3.9
M3
for HDD case2.0 – 2.5 1.7 – 2.2 
						

							HP OmniBook 900 Removal and Replacement 2-3
Removing the Battery
(User-Replaceable)
Required Equipment
 · None.
Removal Procedure
 1. Unplug the ac adapter, if present.
 2. Slide the battery’s front panel to the right.
 3. Pull the battery out of the bay.
 
 Figure 2-1. Removing the Battery 
						

							2-4 Removal and Replacement HP OmniBook 900
Reassembly Notes
 · If you are installing a new battery, first snap the correct panel onto the front of the battery. For a
12-inch display, use the flat battery panel—for a 13-inch display, use the curved battery panel. To
remove a panel, slide it open, then twist the upper edge of the panel off the battery.
 
 
  Figure 2-2. Installing a Battery Panel
 · Make sure the front panel of the battery is open before inserting the battery. 
						

							HP OmniBook 900 Removal and Replacement 2-5
Removing a RAM Board
(User-Replaceable)
 Table 2-4. RAM Board Replacement Part Numbers
DescriptionPart NumberExchangeOmniBook
Part Number900B900†
RAM board, 32MB PC100 SODIMM 1818-7950
··
RAM board, 64MB PC100 SODIMM 1818-7951 F1660-69103
··
RAM board, 128MB PC100 SODIMM 1818-7952 F1660-69104
··
  Caution
 
Handle the RAM board only by its edges and provide proper grounding. Otherwise, you may
damage the board due to electrostatic discharge.
Required Equipment
 · Small Phillips screwdriver.
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), then free the snap at the center
of the back edge.
 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 two latches at the sides of the RAM board, so the free edge of the board pops up.
 7. Pull the board out of the connector. 
						

							2-6 Removal and Replacement HP OmniBook 900
 
 
                          
  Figure 2-3. Removing a RAM Board
Reassembly Notes
 · Insert the RAM board into the connector at about a 30° angle until it is fully inserted. Then press
down at both sides until both latches snap closed.
 · 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.
Removing the Hard Disk Drive
(User-Replaceable)
  Exchange Information
 
W hen returning a bad hard disk drive to HP, describe the symptoms on a piece of paper and
attach it to the part—do not use tape.
 Table 2-5. Hard Disk Drive Replacement Part Numbers
DescriptionPart NumberExchangeOmniBook
Part Number900B900†
Drive, hard disk (4.3GB, 9.5mm, IBM) * 0950-3409 F1711-69100·
Drive, hard disk (4.3GB, 8.45mm, Toshiba) 0950-3410 F1386-69102·
Drive, hard disk (6.0GB, 9.5mm, IBM) * 0950-3710 F1711-69106·
Drive, hard disk (6.4GB, 9.5mm, IBM) * 0950-3442 F1711-69101·
Drive, hard disk (12GB, 9.5mm, IBM) * 0950-3711 F1660-69105·
* These hard drives are the preferred drives at the time of publication. Drives shipped in units are
subject to change without notice. For current information about preferred and approved drives for
these products, see the latest version of service note HDD-01.
† Models called 900† in this manual have no marking in the serial number, whereas models called 900B
have 900 B after the serial number.
Required Equipment
 · Small Phillips screwdriver.
Keyboard-screw cover
Screw, M2.5×4mm (2)RAM board 
						

							HP OmniBook 900 Removal and Replacement 2-7
Removal Procedure
 1. Unplug the ac adapter, if present, and remove the battery.
 2. Turn the unit bottom side up and remove the hard drive screw from the bottom case.
 3. Open the hard drive door, then pull out the hard drive by its plastic tab.
 
 
 Figure 2-4. Removing the Hard Disk Drive
 4. If you are installing a new hard drive that does not have a cover, you can remove the cover parts
from the old hard drive:
 · Remove the two screws from the case, then lift the plastic tab and remove the plastic cover
and metal shield from the hard disk drive.
 · Carefully pry the connector off the end of the hard disk drive. Work alternately at each end so
that the connector slides off evenly.
 
 
 Figure 2-5. Installing a Hard Drive in the Cover
Screw, M2.5×5mm
Screw, M3×4mm
HDD cover kit
Hard disk drive
Small tabs on connector
face down in this view. 
						

							2-8 Removal and Replacement HP OmniBook 900
Reassembly Notes
  Caution
 
Do not cover the vent hole in the top surface of the hard drive. If you cover the hole, the hard drive
could fail prematurely.
 · The small plastic tabs on the connector face the top of the drive, and the metal shield fits behind
the tabs.
  Important
 ·  If you are installing a new hard drive, create a Hibernate partition on the drive before loading
any software—see the steps below.
 
Note
 
For an OmniBook 900 with a 12-inch display and serial number before TW 92500000, if the hard
disk drive has been damaged by excessive pressure, 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 hard disk.
 ·  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 replace the top case and 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 top case, bottom case, and install a HDD bracket above the
hard disk slot. (Service note 900-14.)
Creating a Hibernate Partition
 1. Connect an external module bay and CD-ROM drive to the OmniBook.
 If you do not have an OmniBook CD-ROM module or external module bay, you must attach
another type of CD-ROM drive.
 2. Plug in the ac adapter.
 3. Insert the Recovery CD in the CD-ROM drive.
 4. Shut down and restart the computer—when you see the HP logo, press ESC two times.
 5. Select the CD-ROM drive as the boot device.
 6. When the Recovery CD dialog box appears, follow the displayed instructions. Accept the
recommended partition size. If you install the factory software, the recovery process can take up
to 10 minutes.
 If you want to create the Hibernate partition without installing the factory software, click
Advanced and select the option to not install the operating system. If you intend to install
Windows NT, you should choose the FAT16 option or the Hibernate-only option.
 Note: If, instead, you see an MS-DOS menu of options, select “Recover...” to create the
Hibernate partition and install the factory software, which can take up to 60 minutes. Or select
“Create Hibernate Partition” to not install the software. Accept the recommended partition size.
 7. When prompted to reboot the computer, press CTRL+ALT+DEL and follow any displayed
instructions. 
						

							HP OmniBook 900 Removal and Replacement 2-9
Replacing Small Parts
(User-Replaceable)
The following small parts are user-replaceable.
 Table 2-6. Replacing Small Parts (User-Replaceable)
PartReplacement Procedure
Battery panelRemove the battery, then twist the upper edge of the panel off the battery.
Bumper, display
(upper)Insert a small flat-blade screwdriver under the bumper and pry it loose. To replace,
firmly press the adhesive side of the bumper into the recess.
Cap, pointing stickPull the cap off the pointing stick.
Cover, display screw
(lower)Insert a small flat-blade screwdriver under the cover and pry it loose. To replace,
firmly press the adhesive side of the cover into the recess.
Cover, hingePut 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. Open the display fully. Push in at the bottom-
front of the cover to unsnap it from the top case.
Cover, keyboard
screwPut 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.
Door, hard diskOpen the door about 45° and flex the door until one side tab releases.
FootInsert a small flat-blade screwdriver under the foot and pry it loose. To replace, firmly
press the adhesive side of the foot into the recess. 
						

							2-10 Removal and Replacement HP OmniBook 900
Removing the LCD Module
(HP Authorized Service Providers Only)
  Exchange Information
 
W hen returning a bad LCD module to HP, describe the symptoms on a piece of paper and attach
it to the part—do not use tape.
  Table 2-7. Display Component Compatibility
LCD Type*12 IBM12 Mitsubishi13 LG13 Unipac
OmniBook Model900†/900B900†/900B900B900B
Bezel, displayF1711-60915 F1770-60906
Cable, LCD flexF1711-60918 F1769-60913 F1770-60923 F1770-60910
Cable, powerF1711-60919 F1770-60912
Case, displayF1711-60978 F1711-60971 F1770-60907
Latch, displayF1711-60979 F1770-60901
Hinge, coverF1770-60902
Hinge, display (pair)F1711-60938 F1770-60908
LCD ModuleF1711-69039 F1711-69072 F1770-69021 F1770-69020
Support, left hingeF1711-60910 F1770-60914
Support, right hingeF1711-60911 F1770-60915
* To identify the type of LCD module, see the marking printed on the LCD flex cable where it plugs into the
base—it may be on the top or bottom of the cable.
† Models called 900† in this manual have no marking in the serial number, whereas models called 900B
have 900 B after the serial number.
Required Equipment
 · Small Phillips screwdriver.
 · Small flat-blade screwdriver.
 · Pointed knife or probe.
Removal Procedure
 1. Unplug the ac adapter, if present, and remove the battery.
 2. On the display bezel, remove the two upper bumpers and two lower screw covers (using a pointed
knife or probe), then remove the four screws.
 3. Along the top of the display, pull the bezel upward, toward the edge of the case, until the snaps
release.
 4. Starting at the top corners, repeat along the left and right sides, pulling outward to release the left
and right edges.
 5. Lift the top of the bezel away from the case about 7 cm (3 inches). The snaps along the bottom of
the bezel should release.
 6. On the edge of the LCD module, unplug the LCD power wires from the power cable.