HP Omnibook 500 Service Manual

							HP Omnibook 500 Removal and Replacement 2-25
Removing the Motherboard or Bottom Case
(HP Authorized Service Providers Only)
Required Equipment
 
• #0 Phillips screwdriver.
Removal Procedure
  Note: Before Replacing the Motherboard
 
If possible, record the computer’s electronic serial number before you replace the motherboard.
You will then store the electronic serial number in the EEPROM on the new motherboard using
the Service Utility floppy disk.
1.  Download the Omnibook 500 service package from the Partnership web site (see page vi),
and create a Service Utilities floppy disk as described in the package’s Readme file.
2.  Connect a floppy disk drive to the computer using a USB floppy cable, or dock the computer
and insert a floppy drive module into the expansion base.
3.  Connect an external monitor to the computer, so you can verify the boot process.
4.  Plug in an AC adapter.
5.  Insert the Service Utilities floppy disk in the floppy drive.
6.  Turn on the computer. W hen the HP logo appears (on either the built-in display or the external
monitor), press ESC to display the boot menu, then boot from the floppy disk.
7.  Select the Serial Number option from the boot menu.
8.  W hen prompted, type A for the automatic update option. This stores the current system data
from the old motherboard on the floppy disk.
 1.
 Unplug the AC adapter, if present, and remove the battery.
 2.
 Remove these additional assemblies:
 
• Hard disk drive (page 2-6).
 
• Power button panel (page 2-9).
 
• Keyboard (page 2-10).
 
• System SDRAM module (page 2-12).
 
• Expansion SDRAM module, if present (page 2-13).
 
• Switchboard PCA (page 2-15).
 
• Display assembly (page 2-18).
 
• Heatsink/fan (page 2-21).
 
• Top case (page 2-23).
 3.
 Remove all three screws from the audio/PC Card panel. Flip out the PC Card eject button, so that
it stands out from the side of the unit, then remove the panel. 
						

							2-26 Removal and Replacement HP Omnibook 500
 4.
 Disconnect the speaker wires from the motherboard. If the connector does not release easily, try
gently pressing down on the rear of the connector (near the wires) as you pull it out.
 5.
 Remove the right-rear screw (nearest the speaker) from the hard drive/LED flex cable, then
disconnect the cable from the motherboard.
 6.
 Remove both standoff screws from the back of the unit.
 7.
 Remove the four screws from the motherboard (each marked by a white arrow on the
motherboard).
 8.
 
Certain models only: remove the screw attaching the EMI plate to the bottom case, and remove
the EMI plate.
 9.
 Lift the motherboard out of the bottom case.
See “Replacing the Motherboard” on page 2-27 or “Replacing the Bottom Case” on page 2-29 for
additional procedures.
 
 Figure 2-19. Removing the Motherboard
Reassembly Notes
 
• Insert the battery connector through its opening in the bottom case, then lower the motherboard
into place.
 
• Make sure the hard drive guide’s forward screw lug lies on top of the motherboard and beneath
the screw lug on the audio/PCMCIA panel.
 
• Make sure the audio-out jack, external microphone jack, and PC Card eject button fit through
their openings in the audio/PCMCIA panel.
 
• 
Mini-PCI models only: route the cables from the mini-PCI panel to avoid interfering with
installation or operation of other components (see Figure 2-12 on page 2-15).
Screws, M2×3mm (4)
Screw, M2×3mm
Screws,
M2×2mm (2)
Standoff screws,
5mm (2)
Screw, M2×5mm
Screw, M2×2mm 
						

							HP Omnibook 500 Removal and Replacement 2-27
Replacing the Motherboard
Required Equipment
 
• #0 Phillips screwdriver.
Removal Procedure
 1.
 
Mini-PCI models only: release the latches at the sides of the card, so that its free edge pops up,
and carefully pull the card out of its connector.
 2.
 
Mini-PCI models only: disconnect the cables that connect the mini-PCI panel to the
motherboard, and remove the panel and the mini-PCI card (still connected) from the motherboard.
 3.
 Disconnect and remove the backup battery. If the connector does not release easily, try gently
pressing down on the rear of the connector (near the wires) as you pull it out.
 
 Figure 2-20. Removing Motherboard Components
Mini-PCI panelMini-PCI card
Backup battery 
						

							2-28 Removal and Replacement HP Omnibook 500
Reassembly Note
 
• Reinstall the motherboard in the unit following the “Reassembly Notes” on page 2-26.
  Note: After Replacing the Motherboard
 
After replacing the motherboard, you must use the Service Utility floppy disk to store the system
data and display information in the EEPROM on the new motherboard.
1.  Connect a floppy disk drive to the computer using a USB floppy cable, or dock the computer
and insert a floppy drive module into the expansion base.
2.  Plug in an AC adapter.
3.  Insert the Service Utilities floppy disk in the floppy drive.
4.  Turn on the computer.
5.  If you hear 5 beeps, press F1 to update the display data stored on the motherboard. Let the
computer reboot and go to the next step.
6.  Select the Serial Number option from the boot menu.
7.  If you successfully stored system data on the floppy disk before removing the old
motherboard, type A for the automatic update. This restores the old system data on the new
motherboard.
  If you did not store system data, type M for the manual update option. Enter the serial number
from the bottom of the unit—you may have to contact an HP support center to do this. 
						

							HP Omnibook 500 Removal and Replacement 2-29
Replacing the Bottom Case
  Important
  Due to contractual restrictions imposed by Microsoft, an HP authorized service provider
must follow special procedures when replacing the bottom case. These restrictions affect
the distribution, handling, and tracking of new, replacement, and replaced Microsoft
Certificate of Authenticity labels attached to the bottom case of the computer. Contact the
HP Call Center in your region for information or see service note 500-03.
  Important
  If the notebook is an option code ARE (for Malaysia), the bottom case can be replaced only
by the regional repair center in Taiwan. This requires sending the entire unit to the repair
center. Contact the HP Call Center in your region for shipping information.
Required Equipment
 
• #0 Phillips screwdriver.
Removal Procedure
 1.
 Remove both screws from the speaker assembly and remove the speaker assembly from the unit.
 2.
 Remove the three remaining screws from the hard drive/LED flex cable, then lift the cable off of
its connector and out of the unit.
 3.
 Remove the screw from the hard drive guide, and remove the guide. 
						

							2-30 Removal and Replacement HP Omnibook 500
 
 Figure 2-21. Removing Bottom Case Components
Installation Procedure
 1.
 Install a new Microsoft Product ID label.
 2.
 Transfer the old serial number label and install a new overlay, or create a new serial number label
using the steps below.
 3.
 Restore the labels on the bottom case, as follows:
 
• If the notebook includes a hardware modem mini-PCI card, attach the hardware modem
telecom regulatory label.
 
• If the notebook includes a LAN/modem mini-PCI card, attach the LAN/modem telecom
regulatory label.
 
• If the notebook is an option code AB2 (for China) or ACQ (for South Africa), add the
appropriate sticker included in the telecom sticker set.
 4.
 Reinstall the bottom case in the unit following the “Reassembly Notes” on page 2-26.
Screws, M2×3mm (3)
Screw, M2×2mm
Screws, M2×5mm (2) 
						

							HP Omnibook 500 Removal and Replacement 2-31
Reassembly Notes
 
• Be careful not to trap the speaker gasket beneath the heads of the retaining screws. Also,
reinstallation may be easier if you first position the speaker grill in the bottom case, then set the
speaker in place.
 
• To replace the docking doors, proceed as follows:
  1.
 Insert a flat-blade screwdriver between the doors, toward the right end of the doors (farthest
from the speaker), and carefully bend one of the doors upward.
 Figure 2-22. Replacing the Docking Doors
  2.
 Grasp the door with one hand, and with the other hand take the right end of the door off of
its pivot pin.
  3.
 Repeat step 2 for the remaining door.
  4.
 Take the left ends of both doors off of their pivot pins.
  5.
 When installing the new doors, insert the spring end of the doors first, and be careful not to
catch the spring on the pivot pins.
Installing a New Serial Number Label
Download the latest version of the serial number label template (Microsoft Word format) from the
Partnership web site (see page vi) under Support/Service in Technical Support Information. The latest
version includes fields for warranty period and manufacturing location. Store the template with other
Word templates on a PC connected to a laser printer.
 1.
 Open a new document based on the serial label template.
 2.
 Enter the information from the old serial label, and print the new label on plain white paper. The
new label does not have barcodes.
 3.
 Carefully cut out the new serial label just inside the border and place it into the inner recess in the
bottom case. The bottom of the label goes toward the front of the case.
 4.
 While holding the paper label in place, attach a serial label overlay into the outer recess. It covers
and protects the serial label.
HP Serial Number (S)TW711A1234 1YR
(1P) F2072 W   EA   MFG# TW711A1234
Made in Taiwan
Figure 2-23. Example of Serial Number Label 
						

							2-32 Removal and Replacement HP Omnibook 500
Repairing the BIOS IC
(HP Authorized Service Providers Only)
The BIOS IC of the Omnibook 500 is not replaceable:
 
• If the BIOS IC is defective, you must replace the motherboard.
 
• However, if the BIOS IC might only be corrupted, you can attempt to repair it using a Crisis
Recovery floppy disk—see below.
  Note: Reprogramming the BIOS IC
 
A new BIOS IC contains only enough basic programming to boot the Omnibook. After installing a
new motherboard, you must reprogram the BIOS IC, preferably with the latest BIOS. You can
download the latest BIOS from the HP Notebook web site (see page vi)—follow the directions
provided.
If you do not have a BIOS Crisis Recovery floppy, download the package from the Partnership web
site (see page vi) under Product Support Information in the Service and Support Library. Follow the
instructions for creating the floppy disk.
  Caution
 
Make sure you are using the correct BIOS Crisis Recovery floppy for the Omnibook model you are
repairing. The program does not verify the Omnibook model, so you could install the wrong BIOS
image.
 1.
 Dock the computer, and plug in an AC adapter.
 2.
 Connect a floppy disk drive to the computer using a USB floppy cable, or dock the computer and
insert a floppy drive module into the expansion base.
 3.
 Insert the BIOS Crisis Recovery floppy in the floppy drive.
 4.
 Turn on the computer. When the HP logo appears, press ESC to display the boot menu, then boot
from the floppy disk.
 If the computer does not turn on at all, boot from the floppy disk as follows:
 
• Unplug the AC adapter.
 
• Press and hold Fn+B.
 
• Plug in the AC adapter.
 
• Release Fn+B.
 5.
 If the computer does not boot from the BIOS Crisis Recovery floppy, try plugging the boot-block
jumper into the expansion base parallel port, then go to the next step. See the wiring diagram
below.
 (In many situations you can skip this step—especially if the computer previously displayed a
BIOS checksum error.) 
						

							HP Omnibook 500 Removal and Replacement 2-33
 6.
 Wait while the BIOS is reprogrammed—the display is blank for a minute or more while this
happens.
 If you plugged in a boot block jumper, unplug it before the computer automatically reboots.
 7.
 Make sure the BIOS is the latest version. (You can check this in the Main menu of BIOS Setup,
or in the BIOS menu of Windows e-DiagTools.) If necessary, reprogram the BIOS IC—see the
note at the beginning of this topic.
 
141
25 13
  Figure 2-24. Boot-Block Jumper 
						

							2-34 Removal and Replacement HP Omnibook 500
Removing Omnibook Components
(HP Authorized Service Providers Only)
Required Equipment
 
• #0 Phillips screwdriver.
 
• Small flat-blade screwdriver.
Removal Procedure
 1.
 Unplug the AC adapter, if present, and remove the battery.
 2.
 Remove the assemblies and follow the additional steps given in the table below.
 Table 2-8. Removing Omnibook Components
ComponentRemoval ProcedureAdditional Steps
Battery, backupPower button panel
(page 2-9).
Keyboard (page 2-10).
Switchboard PCA
(page 2-15).
Display (page 2-18).
Top case (page 2-23).Disconnect the cable from the motherboard. If the
connector does not release easily, try gently pressing
down on the rear of the connector (near the wires) as
you pull it out.
Battery, CMOSPower button panel
(page 2-9).
Switchboard PCA
(page 2-15).Reassembly Note:
 After replacing the CMOS battery,
set the correct time and date using the BIOS Setup
utility or Date/Time in the Control Panel.
Cable, HDD/LED flexHard disk drive (page 2-6).
Power button panel
(page 2-9).
Keyboard (page 2-10).
Switchboard PCA
(page 2-15).
Display (page 2-18).
Top case (page 2-23).Remove the four screws from the cable, then lift the
cable off of its connector and out of the unit.
Case, bottomSee page 2-25.
Case, topSee page 2-23.
DisplaySee page 2-18.
Doors, dockingSee page 2-31.
Guide, hard driveHard disk drive (page 2-6).
Power button panel
(page 2-9).
Keyboard (page 2-10).
Switchboard PCA
(page 2-15).
Display (page 2-18).
Top case (page 2-23).Remove both screws from the guide, and remove it
from the unit.
Reassembly Note:
 Make sure the guide’s screw lug
lies on top of the motherboard and beneath the screw
lug on the audio/PCMCIA panel.