HP Omnibook 4100 4150 Service Manual

							HP OmniBook 4100/4150 Removal and Replacement 2-19
Removing the CPU Module
(HP Authorized Service Providers Only)
  Caution
 
For an OmniBook 4150 Series, do not unnecessarily remove the CPU module from the
motherboard. The CPU connector is easily damaged during removal and insertion.
  Table 2-8. CPU Component Compatibility
OmniBook 4100OmniBook 4150†
Pentium (T)266 MHzPentium II (MD)233-266 MHzPentium II (MD)300 MHz2-Screw Top Plate
Pentium II (MD,D)300-400 MHz5-Screw Top Plate
CPU moduleF1440-69102 F1440-69103 (233 MHz)
F1440-69104 (266 MHz)F1440-69016 (300 MHz) F1440-69016 (300 MHz)
F1640-69101 (333 MHz)
F1640-69102 (366 MHz)
F1640-69103 (400 MHz)
IC, BIOSF1460-12016 F1460-12007 (not replaceable) (not replaceable)
PCA, motherboardF1460-69002 F1460-69004 F1629-69001*
F1640-69001*F1640-69001
Plate, CPU bottomF1460-60949 (Rev 4) F1629-80003
Plate, CPU topF1460-60951 F1460-60950 F1640-80002
Spacer, CPU(none) F1462-80003 (none) (none)
Thermal pads5182-5153 (notched)
F1463-80001 (large)
F1463-80002 (medium)
F1463-80003 (small)5182-5153 (notched)
F1462-80004 (square)For top plate:
F1640-60911 (notched)
Heatsink, finnedF1460-60953 (M2 screw)
F1629-60913 (M3 screw)F1629-60913 F1640-60910
Heatsink coverF1460-60952 (M2 screw)
F1629-60914 (M3 screw)F1629-60914 (none)
* For serial numbers below TW85299999, use F1629-69001. For serial numbers above TW90100000, use F1640-69001.
† Models called 4150† in this manual have no marking in the serial number, whereas models called 4150B have 4150 B
after the serial number.
OmniBook 4150B
Pentium II (D)366-400 MHzHeatsink/Top Plate
CPU moduleF1640-69102 (366 MHz)
F1640-69103 (400 MHz)
IC, BIOS(not replaceable)
PCA, motherboardF1660-69009
Thermal padsFor heatsink:
F1640-60911 (notched)
Heatsink/top plateF1660-60903
Required Equipment
 · Small Phillips screwdriver.
 · OmniBook 4150† CPU removal tool (HP part number T-335665). 
						

							2-20 Removal and Replacement HP OmniBook 4100/4150
Removal Procedure
 1. Unplug the ac adapter, if present, and remove the battery.
 2. Remove these additional assemblies:
 · Floppy module or other module (page 2-3).
 · Hard disk drive (page 2-5).
 · Keyboard (page 2-9).
 3. For an OmniBook that has a 2-screw CPU top plate, remove the screw from the heatsink cover
and lift it off the heatpipe. (The figure on page 2-26 shows these and other parts.)
 4. Remove the screws holding the CPU top plate (see the picture on page 4-8 for details):
 · For an OmniBook 4150B, remove the five screws from the heatsink/top plate assembly—one
at the front-right corner (M2×12mm), two at the left side (M2 with spring), and two at the
diagonal corners of processor (M2×3.5mm).
 · For an OmniBook 4150† with a 5-screw CPU top plate, remove the five screws—one at the
heatsink (M2×5mm), two at the corners of the CPU housing (M2×14mm), and two at
diagonal corners of the CPU module below (M2×3.5mm). (Do not remove the two small
screws above the middle of the CPU.)
 · For an OmniBook with a 2-screw CPU top plate, remove the two screws at the corners
(M2×14mm).
 5. For an OmniBook 4150B, lift off the heatsink/top plate.
 For an OmniBook 4150† with a 5-screw CPU top plate, lift off the top plate, carefully detaching
the heatpipe end tab from the slot in the fan cover. 
						

							HP OmniBook 4100/4150 Removal and Replacement 2-21
  Caution
 
In the next step, follow these precautions to prevent damage to the CPU connectors:
 ·  Do not raise the left end higher than the right end during removal.
 · OmniBook 4150B: Insert a flat, non-metallic blade under the front of the CPU module near
the right end. Pry up against the motherboard until the CPU releases. Repeat at the back
edge, then lift off the module.
 · OmniBook 4150†: Use the CPU removal tool to remove the CPU assembly.
  a. Hold the tool so the large notch is toward the front of the computer.
  b. Hold the hooked arm of the tool just to the right edge of the right tab on the top plate. If the
top plate has been removed, hold the arm about 4 mm (1/8 inch) to the right of the hook on
the bottom plate.
  c. Hook the hooked arm under the lower-back edge of the CPU assembly (#1) next to the
right tab.
  d. Lower the front arm of the tool so it straddles the connector housing on the motherboard
(#2).
  e. Pull the tool handle toward the front to lift out the assembly (#3). Then remove the tool from
the assembly.
 
 Figure 2-9. Removing the CPU (OmniBook 4150†)
 · OmniBook 4100: To remove the CPU assembly, lift firmly on the back edge of the bottom
plate near the right corner. This requires firm force. After the back edge releases, lift off the
assembly.
 
To reinstall the CPU assembly, see the precautions under “Reassembly Notes.”
 6. Remove the complete CPU assembly so it unplugs from the motherboard—see the caution above.
 7. If necessary, slide off the top plate, then remove the CPU module from the bottom plate.
 
Note
 
For an OmniBook 4100 with a serial number below TW 84099999, if the CPU bottom plate has a
revision number less than “Rev 4”, replace the bottom plate with one that is “Rev 4” or higher.
(Service note 4100-03.)
The arm lines up
with the right
edge of the tab.
The notch fits over
the plastic connector
housing. 
						

							2-22 Removal and Replacement HP OmniBook 4100/4150
Reassembly Notes
 · For an OmniBook 4100 or 4150†, before installing the CPU module, assemble it into the bottom
plate. For a 2-screw CPU top plate, attach the top plate to the assembly—do not attach a 5-screw
top plate before installing the assembly. Then install the assembly on the motherboard. See the
following caution.
  Caution
 
Install or replace CPU module thermal pads that are missing or damaged. Do not reuse a notched
CPU pad on a new CPU module. See the figure following this caution.
 · OmniBook 4150B: Align the front-right corner of the CPU module and gently lower it onto the
connector. Press down on the CPU module until it seats, as described below.
 · OmniBook 4150†: Carefully remove the CPU assembly—the contacts on the CPU
connectors are easily damaged.
  a. Align the front-right corner of the CPU assembly correctly and gently lower the assembly
onto the connector.
  b. Place your fingers on top of the CPU assembly above the front and back ends of the
connector (#2 and #1). Do not push at other locations.
  c. Press firmly at the back end (#1) while holding down the front—until the back engages.
  d. Then press down the front down (#2) while holding the back.
  e. Press firmly until the CPU assembly seats in the connector—you should feel a slight click.
 
 Figure 2-10. Inserting the CPU (OmniBook 4100/4150†)
 · OmniBook 4100: Keep the CPU assembly flat while installing it. Press it down above the
connectors at the right end. Otherwise, you could damage the connectors.
 
Before installing the screws, make sure the CPU assembly is fully seated so the bottom plate is
touching the motherboard. Otherwise, you could strip the screws.
 
Install the two screws in diagonally opposite corners of the top plate.
 · For an OmniBook 4150† with a 5-screw CPU top plate, install the top plate after installing the
bottom plate and CPU. The tab on the top plate heatpipe must first be slipped into a slot under the
fan cover, as the top plate is lowered into position on the CPU.
 · If you removed conductive tape grounding straps from the CPU top plate, install them again.
Hold both edges.
Push down one
edge at a time. 
						

							HP OmniBook 4100/4150 Removal and Replacement 2-23
 
Figure 2-11. Positioning Thermal Pads
CPU, 333-400 Pentium II (D)
(1 thermal pad
on bottom of top plate)
CPU, 233-300 Pentium II (MD)
(2 thermal pads) CPU, Pentium (T)
(4 thermal pads)
Note: Spacer
(OmniBook 4100
only)
CPU, 300 Pentium II (MD)
(1 thermal pad
on bottom of top plate)
OmniBook 4100/4150†, 2-Screw Top Plate
OmniBook 4150†, 5-Screw Top PlateInstall new pad on new CPU
CPU, 366-400 Pentium II (D)
(1 thermal pad
on bottom of heatsink/top plate) OmniBook 4150B, Cast Heatsink/Top Plate 
						

							2-24 Removal and Replacement HP OmniBook 4100/4150
Removing the Motherboard or Bottom Case
(HP Authorized Service Providers Only)
Required Equipment
 · Small Phillips screwdriver.
 · 5-mm hex driver (or 3/16 inch).
 · OmniBook 4150 CPU removal tool (HP part number T-335665).
Removal Procedure
 1. Unplug the ac adapter, if present, and remove the battery.
 2. Remove these additional assemblies:
 · Floppy module or other module (page 2-3).
 · Hard disk drive (page 2-5).
 · Keyboard (page 2-9).
 · Display assembly (page 2-11).
 · Top case (page 2-16).
 3. Remove the complete CPU assembly—see page 2-19 for detailed precautions and instructions.
 4. On the back of the case, use a 5-mm hex driver to remove the two standoffs from the VGA
connector.
 5. Lift the front of the VGA PCA to unplug the PCA, then slide it out of the case. (If an LVDS PCA
is present, it is attached.)
 6. Remove the screw from the IR PCA and lift the PCA off the frame. Unplug the IR cable from the
motherboard. 
						

							HP OmniBook 4100/4150 Removal and Replacement 2-25
 7. Unplug the fan cable from the motherboard.
 8. On the left frame, remove the screw that holds the plastic heat exchange cover. On an OmniBook
4150B, remove the second screw from the fan. Lift off the cover and fan – they are a single
assembly on the OmniBook 4150B.
 9. On the left frame, remove the screw that holds the frame to the motherboard, then lift out the
frame.
 10. Lift out the side air vent cover. If a finned heatsink is present at the left side of the case, lift it out.
 11. On the right frame, remove the two screws that hold the frame to the case, then lift out the frame.
 12. Remove the screw holding the motherboard at the back-right corner.
 13. Unplug the DC-DC PCA from the right side of the motherboard.
 14. Lift the front-right corner of the motherboard and remove the audio jack cover from the case.
 15. Unplug the audio jack PCA from the motherboard. The metal shield comes off with the PCA.
 16. Note the routing of the speaker wires. Then unplug the speaker wires from the motherboard.
 17. Remove the two screws from the RAM/BIOS cover and remove it from the bottom of the unit.
 
Hint
 
In the next step, while removing the motherboard, reach through the RAM opening and separate
the case from the PCA. Otherwise, the PCA sticks in the bottom case.
 18. Lift the front edge of the motherboard until it clears the hard drive compartment in the bottom
case and frees itself from the bottom case. Then slide the PCA forward and lift it out.
 The docking doors may come out while you are removing the motherboard. 
						

							2-26 Removal and Replacement HP OmniBook 4100/4150
 
 Figure 2-12. Removing the Motherboard
Screw, M2×14mm (2)*Screw, M2×3.5mm or*
M3×4mm
CPU with top plate, bottom plate*
LVDS PCA
VGA PCAHeatsink cover*
Heatsink (finned)*
DC-DC PCA
Audio jack PCA
VGA standoff (2)
Air vent cover
Left frame
Screw, M2.5×5mm
IR PCA
Audio jack cover
Right frame
Screw, M2.5×5mm
RAM/BIOS
cover
Screw, M2×3.5mm
(OB 4100) or
M3×4mm
(OB 4150)
Heatpipe*
(part of CPU top plate)
Heat exchange cover
(For OB 4150B this is part
of fan, held by two screws)
Motherboard
Fan
Screw, M2.5×16mmScrew, M2.5×5mm
Note:
For an OmniBook 4150† with a 5-screw CPU top
plate or an OmniBook 4150B, you must remove
the top plate before removing the CPU
assembly—see the steps on page 2-19. The
CPU and heatsink parts (
*) differ from those
shown below. 
						

							HP OmniBook 4100/4150 Removal and Replacement 2-27
Reassembly Notes
  Note: Installing a New Motherboard
 · Caution: Replace the motherboard with one that is compatible with the OmniBook model and
CPU module—see the table on page 2-19.
 ·  If any RAM boards are present, transfer them from the old motherboard to the new one:
 ·  Reprogram the BIOS IC—see the note below.
 ·  Store the serial number electronically in the new motherboard—see the steps below.
 
Note: Installing a New Bottom Case
 ·  Transfer these parts from the old bottom case to the new one:
 
I/O door, docking doors, and module latches (see the figures below).
 
Speakers.
 ·  Install a new regulatory/business card label.
 ·  Transfer the old serial number label and install a new overlay—or create a new serial number
label using the steps below.
 · Route the speaker wires so they do not get pinched or block screw holes.
 · When you install the audio jack PCA, the metal shield goes under the motherboard. If the shield
comes off the PCA, you can install the shield after you install the PCA.
 · For an OmniBook 4100 or 4150†, route the fan wires at the bottom of the opening next to the
motherboard.
 · When attaching the IR PCA to the right frame, make sure the PCA is parallel with the back of the
case.
 · For an OmniBook 4150† with serial number TW924xxxxx, install a rubber VGA spacer on the
top of the PCA at the front-left corner. (Service note 4150-11.)
  Caution
 
See “Removing the CPU Module” on page 2-19 for detailed precautions and instructions about
installing the CPU module.
 
Note
 
If you installed a new motherboard with a new BIOS IC, the IC contains only enough basic
programming to boot the OmniBook. After installing the motherboard, you must reprogram the IC.
Hewlett-Packard prefers that you program the IC with the latest BIOS. You can download it from
the OmniBook website (see page vi)—follow the directions provided. 
						

							2-28 Removal and Replacement HP OmniBook 4100/4150
 
                        
 Figure 2-13. Installing Docking Doors and Module Latch
Storing the Serial Number Electronically
 1. Exit Windows and boot to a DOS prompt.
 2. Run ESN.EXE from one of these sources:
  On a factory software installation, change to the \Omnibook\Drivers\Hputils directory and
type 
esn at the prompt.
  Otherwise, copy \Omnibook\Drivers\Hputils\Esn.exe from the OmniBook 4100 or 4150
Recovery CD, then run it on the OmniBook.
 3. Store the serial number:
  If you are prompted for the serial number, type the serial number shown on the bottom of the
case.
  If a serial number has already been stored, you must call an HP support center to change it.
Installing a New Serial Number Label
If you do not have a master file that creates serial number labels with fields for “4150 B” and
manufacturing location, get a copy from the Reseller website (see page vi) under Support/Service in
Technical Support Information.
 1. Using any PC connected to a laser printer, open the master serial label file, enter the serial number
and product number from the old serial label, and print the new label on plain white paper. The
new label does not have barcodes.
 2. 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.
 3. 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 4150 B
(1P)F1660W MFG# TW711A1234
Made in Taiwan
Figure 2-14. Example of Serial Number Label
Note: Left latch shown.
Rotate the latch 180° to
load the spring. Note: View from inside the case.
Rotate the doors 360° to load the spring.