HP Omnibook Xe4500 Service Manual

							HP Omnibook XE4100/XE4500 Removal and Replacement 2-27
Removing the Heatsink (with Fan)
(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 cover (page 2-10).
 • Switchboard PCA (page 2-13).
 • Keyboard (page 2-13).
 • Display assembly (page 2-17).
 • Top case (page 2-20).
 3. Remove all three retaining screws.
 4. Lift up on the heatsink (with fan) and then disconnect the fan cable from the motherboard.
 
  Figure 2-16. Removing the Heatsink (with Fan)
Screw, M2.5×4mm (3) 
						

							2-28 Removal and Replacement HP Omnibook XE4100/XE4500
 Caution
  Do not spin the fan blades with your finger, or you could damage the fan’s bearings.
Reassembly Notes
 • If the thermal pad is damaged, use a sharp knife or scraper to carefully remove it from the heat
sink, then attach a new thermal pad.
 • Install the heatsink screws in this order:
1. Install all three screws lightly.
2. Fully tighten the screws in the order marked on the heatsink. 
						

							HP Omnibook XE4100/XE4500 Removal and Replacement 2-29
Removing the CPU Module
(HP Authorized Service Providers Only)
Required Equipment
 • Small flat-blade 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 cover (page 2-10).
 • Switchboard PCA (page 2-13).
 • Keyboard (page 2-13).
 • Display assembly (page 2-17).
 • Top case (page 2-20).
 • Heatsink (page 2-16).
 3. Turn the lock screw one-half turn counterclockwise to release the CPU module (you should hear a
light snap). Carefully lift the CPU module off of its socket on the motherboard.
 
Figure 2-17. Removing the CPU Module
IMPORTANT: See the
Caution on the next
page before
reinstalling the CPU
module! 
						

							2-30 Removal and Replacement HP Omnibook XE4100/XE4500
Reassembly Notes
  Caution
 
Each time you install a new CPU module, you must also replace the heat sink’s thermal pad to
maintain optimum heat transfer. Use a sharp knife or scraper to carefully remove the old thermal
pad from the heat sink, then attach the new thermal pad.
 • The CPU module is keyed for installation, and can be inserted only one way.
 • Carefully insert the CPU module into the motherboard, and turn the lock screw one-half turn
clockwise to secure the CPU module.
 • Be sure to replace the thermal pad on the heatsink, as described in the reassembly notes on
page 2-28. 
						

							HP Omnibook XE4100/XE4500 Removal and Replacement 2-31
Removing the Motherboard
(HP Authorized Service Providers Only)
Required Equipment
 • Small 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 service package for the Omnibook XE4100 (technology code KC) or Omnibook
XE4500 (technology code KB) from the Partnership web site (see page vii), and create a Service
Utilities floppy disk as described in the package’s Readme file.
2.  Plug in an AC adapter.
3.  Insert the Service Utilities floppy disk in the floppy drive.
4.  Turn on the notebook. W hen the HP logo appears (on either the built-in display or the external
monitor), press Esc to display the boot menu, then choose Removable Device and boot from the
floppy disk.
5.  Select the Serial Number option from the boot menu.
6.  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).
 • Keyboard cover (page 2-10).
 • Keyboard (page 2-13).
 • CD/DVD drive (page 2-16).
 • Display assembly (page 2-17).
 • Top case (page 2-20).
 • Heatsink (page 2-16).
 • Floppy drive (page 2-17). 
						

							2-32 Removal and Replacement HP Omnibook XE4100/XE4500
  Caution: Wireless Models
 
Be careful when removing and attaching antenna cables. Damage to cables or connectors can
degrade performance.
 3. Wireless models only: Remove the mini-PCI door and unplug the two antenna cables from the
mini-PCI card. Do not remove the mini-PCI card at this time.
 4. Remove the four screws that attach the motherboard to the bottom case.
 5. From the back of the notebook, remove the six standoffs (two each from the external monitor port,
serial port, and parallel port).
 6. Remove the antenna cable from the metal holder on the motherboard.
 7. Carefully lift the motherboard out of the bottom case.
 8. If present, remove the modem port cover.
 
  Figure 2-18. Removing the Motherboard
Screw,
M2.5×4mm (4)
Standoff, 5mm (6) 
						

							HP Omnibook XE4100/XE4500 Removal and Replacement 2-33
Reassembly Notes
  Important
 
After replacing the display assembly or motherboard, you must use the Service Utilities floppy disk
to reprogram the EEPROM on the motherboard for the new display.
1.  Download the Omnibook XE4000 Series service package from the Partnership web site (see
page vii), and create a Service Utilities floppy disk as described in the package’s Readme file.
2.  Plug in an AC adapter.
3.  Insert the Service Utilities floppy disk in the floppy drive. If the unit has no internal floppy drive,
connect a USB floppy drive
4.  Turn on the notebook.
5.  W hen you see the HP logo, press ESC to display the boot menu, then boot from the floppy
drive.
6.  Select the option to update the display/LCD identification stored on the motherboard.
 • If you are replacing the CPU module, you must also replace the thermal pad on the heat sink (see
page 2-29).
Wireless Models Only
 • Before installing the motherboard, make sure the round coaxial cables from the antenna PCAs are
held in place by the clips in the bottom case.
 • Make sure there is sufficient length to the front antenna PCA cables so they can easily be
connected to the mini-PCI card.
Reassembly Procedure
  Caution
 
Be extremely careful when replacing the motherboard. The motherboard has EMI springs attached
to it that can bend very easily. Bending any EMI spring could cause a motherboard short.
 
Note: Reprogramming the BIOS IC
 
A new BIOS IC contains only enough basic programming to enable the notebook to boot. After
installing a new motherboard, you must reprogram the BIOS IC, preferably with the latest BIOS—
see page 2-36. 
						

							2-34 Removal and Replacement HP Omnibook XE4100/XE4500
 1. Remove the following components from the old motherboard and install onto the new
motherboard:
 • CPU module
 • Wireless LAN mini-PCI card (if present)
 • SDRAM modules
 2. Follow the reassembly notes in the section entitled “Removing the Motherboard” on page 2-33.
Note: After Replacing the Motherboard
If present, insert the modem port cover into the modem port opening. Afterwards, you must use the
Service Utility floppy disk to store the system data and display information in the EEPROM on the new
motherboard. To do so:
1.  Plug in an AC adapter.
2.  Insert the Service Utilities floppy disk in the floppy drive.
3.  Turn on the notebook.
4.  If you hear 5 beeps, press F1 to update the display data stored on the motherboard. Let the
notebook reboot and go to the next step.
5.  Select the Serial Number option from the boot menu.
6.  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 notebook—you might have to contact an HP support center to do this. 
						

							HP Omnibook XE4100/XE4500 Removal and Replacement 2-35
Replacing Components on a Bottom Case
Reassembly Procedure
 1. Transfer the plastic wireless panel, and if present, the docking port cover from the old bottom case
to the new bottom case.
 2. Install a new Microsoft Product ID label.
 3. Transfer the old serial number label and install a new overlay, or create a new serial number label
using the steps below.
 4. Follow the “Reassembly Notes” on page 2-33.
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 vii) 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. Make sure all regulatory labels that were on the old bottom case are also on the new bottom case.
 5. While holding the paper label in place, attach a serial label overlay into the outer recess. The
overlay covers and protects the serial label.
HP Serial Number (S)TW711A1234 1YR
(1P) F2072 W   EA   MFG# TW711A1234
Made in Taiwan
Figure 2-19. Example of Serial Number Label 
						

							2-36 Removal and Replacement HP Omnibook XE4100/XE4500
Replacing the Left and Right Antennas
If you need to remove or replace an antenna, see the figure below.
 Caution
  Handle the connector ends of the antennas carefully. Failure to do so could degrade notebook
performance.
  Handle the antenna routing metal tabs in the bottom case carefully. These tabs can be easily
broken.
 1. Carefully remove both antennas from the old bottom case.
 2. Route both antenna cables through the new bottom case as shown below. Make sure you leave
enough room at the cable connector end to connect to the mini-PCI card.
  Figure 2-20. Replacing the Antennas
 
Replacing a PCMCIA Door
If you need to remove or replace a PCMCIA door, see the figure below.
 
  Figure 2-21. Removing a PCMCIA Door