HP Omnibook 4100 4150 Service Manual

							HP OmniBook 4100/4150 Removal and Replacement 2-29
Removing or Repairing the BIOS IC
(HP Authorized Service Providers Only)
For the OmniBook 4150 Series, the BIOS IC is soldered to the motherboard and is not replaceable:
 · If the OmniBook 4150 BIOS IC is defective, the motherboard must be replaced.
 · However, if the OmniBook 4150 BIOS IC might only be corrupted, you can repair the BIOS from
a Crisis Recovery floppy—see the information below.
  Note
 
A replacement BIOS IC contains only enough basic programming to boot the OmniBook. After
installing the IC, you must reprogram it. 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.
Required Equipment
 · Small Phillips screwdriver.
 · IC (PLCC) removal tool (similar to OK Industries EX-5).
Removal Procedure
 
Caution
 
Remove all power before removing or installing the BIOS IC. Otherwise, the IC could be damaged.
 1. Unplug the ac adapter, if present, and remove the battery.
 2. On the bottom of the unit, remove the two screws from the RAM/BIOS cover and remove the
cover.
 3. Use an IC removal tool to remove the BIOS IC from its socket.
 
 Figure 2-15. Removing the BIOS IC
IC removal tool 
						

							2-30 Removal and Replacement HP OmniBook 4100/4150
Reassembly Notes
  Caution
 · Replace the BIOS IC with one that is compatible with the CPU module—see the table on page
2-19.
 ·  Align the IC with the slot in the socket. The IC is keyed to fit correctly. If you insert the IC
backward, the IC or motherboard could be damaged.
 · Press down firmly on the IC with your thumb to ensure a proper connection.
 · Reprogram the IC by programming the BIOS—see the note above.
Repairing the BIOS (OmniBook 4150 Series Only)
If you do not have a BIOS Crisis Recovery floppy, download the package from the Reseller website
(see page vi) under Product Support Information in the Service and Support Library. Follow the
instructions for creating the floppy.
  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. Insert the BIOS Crisis Recovery floppy in the floppy drive.
 2. In many situations, you can skip this step—especially if the computer previously displayed a
BIOS checksum error.
 If the computer does not boot from the BIOS Crisis Recovery floppy, try plugging the boot-block
jumper into the OmniBook parallel port, then go to the next step. See the wiring diagram below.
 3. Turn on the computer and allow it to boot from the floppy disk.
 If the computer does not turn on at all, do the following steps to boot from the floppy disk:
 · Unplug the ac adapter.
 · Press and hold Fn+B.
 · Plug in the ac adapter.
 · Release Fn+B.
 4. 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.
 5. After the BIOS is repaired and reprogrammed, check the BIOS version to see whether it is the
latest version. If necessary, reprogram the BIOS IC—see the note at the beginning of this topic. 
						

							HP OmniBook 4100/4150 Removal and Replacement 2-31
 
141
25 1
3
  Figure 2-16. Boot-Block Jumper
Removing Other Components
(HP Authorized Service Providers Only)
Required Equipment
 · Small Phillips screwdriver.
 · Pointed knife or probe (for display components).
 · 5-mm hex driver (or 3/16 inch) (for bottom case components).
Removal Procedure
 1. Unplug the ac adapter, if present, and remove the battery.
 2. Remove the additional assemblies and follow the special steps indicated in the tables below.
Components are separated into these groups:
 · Display components (below).
 · Top case components (page 2-32).
 · Bottom case components (page 2-33).
 Table 2-9. Removing Display Components
ComponentRemoval ProceduresAdditional Steps (See figure on page 4-7)
Cable Holder
(part of display case kit)Display (page 2-11). 1. Remove the display bezel (page 2-13).
2. Unsnap the cover of the cable holder.
3. Use a flat-blade screwdriver to pry the display case
and release the cable holder.
Reassembly Notes: Install the holder so the tabbed
side is toward the bottom of the display case.
Display BezelDisplay (page 2-11) Remove the display bezel (page 2-13).
Caution: Use compatible parts (page 2-13).
Display CaseDisplay (page 2-11). Remove the LCD module and brackets from the case,
but do not disassemble the module (page 2-13).
Reassembly Notes: Transfer the display latch and
cable holder from the old display case.
Caution: Use compatible parts (page 2-13). 
						

							2-32 Removal and Replacement HP OmniBook 4100/4150
ComponentRemoval ProceduresAdditional Steps (See figure on page 4-7)
Display Latch
(part of display case kit)Display (page 2-11). 1. For a 13-inch display, do not remove the LCD
module, but remove the display assembly and
bezel (page 2-13).
For a 14-inch display, remove the LCD module and
brackets from the case, but do not disassemble the
module (page 2-13).
2. Use a flat-blade screwdriver or probe to release
one end of the latch spring.
3. Swing the latch into the display case, then lift it out
of its holders.
End CapDisplay (page 2-11). 1. Remove the display bezel (page 2-13).
2. Lift out the end cap.
HingeDisplay (page 2-11). 1. Remove the display bezel (page 2-13).
2. Remove the hinges and strip cover from the LCD
brackets, then unsnap the hinge covers.
Inverter PCADisplay (page 2-11). 1. Remove the display bezel (page 2-13).
2. On the plastic cable holder, unsnap the cover.
3. Unplug all cables attached to or holding the inverter
PCA. Lift up the PCA if necessary.
Reassembly Notes: Attach cables with tape as in the
original unit.
Caution: Use compatible parts (page 2-13).
LCD Brackets
(part of LCD kit)Display (page 2-11).
LCD module (page 2-13).Caution: Use compatible parts (page 2-13).
LCD Flex CableDisplay (page 2-11).
LCD module (page 2-13).Remove the LCD flex cable from the shield.
Reassembly Notes: Attach the cable to the shield as
in the original unit.
Caution: Use compatible parts (page 2-13).
LCD ModuleSee page 2-13.
LCD Shield
(part of LCD kit)Display (page 2-11).
LCD module (page 2-13).Remove the LCD flex cable from the shield.
Caution: Use compatible parts (page 2-13).
LED Strip CableDisplay (page 2-11). 1. Remove the LCD module and brackets from the
display case, but do not disassemble the module
(page 2-13).
2. If necessary to free the LED cable, remove the right
LCD bracket.
Reassembly Notes: Make sure the LED cable is
routed through the bottom-right corner of the LCD
bracket.
Strip Cover (Top Case)Display (page 2-11). Unsnap the strip cover from the hinge covers.
 Table 2-10. Removing Top Case Components
ComponentRemoval ProceduresAdditional Steps
KeyboardSee page 2-9.
Strip CoverDisplay (page 2-11). Unsnap the strip cover from the hinge covers.
Top CaseSee page 2-16. 
						

							HP OmniBook 4100/4150 Removal and Replacement 2-33
 Table 2-11. Removing Bottom Case Components
ComponentRemoval ProceduresAdditional Steps (See figures on pages 4-2, 4-8)
Air Vent CoverPlug-in module (page 2-3).
Hard drive (page 2-5).
Keyboard (page 2-9).
Display (page 2-11).
Top case (page 2-16).1. Remove the screw from the plastic heat exchange
cover and remove the cover.
2. Lift off the fan and move it aside.
3. For a 2-screw CPU top plate, remove the screw
from the heatsink cover and remove the cover.
4. Remove the 2 or 5 screws from the CPU top plate
and remove the plate.
5. Remove the screw holding the left frame to the
motherboard and lift off the frame.
6. Lift out the air vent cover.
Audio Jack CoverPlug-in module (page 2-3).
Hard drive (page 2-5).
Keyboard (page 2-9).
Display (page 2-11).
Top case (page 2-16).1. Remove the screw from the IR PCA and move the
PCA aside.
2. Remove the two screws from the right frame and
remove the frame.
3. Lift the front-right corner of the motherboard slightly
and remove the audio jack cover.
Audio Jack PCAPlug-in module (page 2-3).
Hard drive (page 2-5).
Keyboard (page 2-9).
Display (page 2-11).
Top case (page 2-16).1. Remove the screw from the IR PCA and move the
PCA aside.
2. Remove the two screws from the right frame and
remove the frame.
3. Unplug the DC-DC PCA.
4. Unplug the audio jack PCA.
During installation, the metal shield goes under the
motherboard.
BIOS ICSee page 2-28.
Bottom CaseSee page 2-19.
CPU Bottom PlateKeyboard (page 2-9).
CPU module (page 2-13).Reassembly Notes: For an OmniBook with a 2-screw
top plate, assemble the CPU module, top plate, and
bottom plate before installing them on the
motherboard.
For an OmniBook 4150† with a 5-screw top plate,
assemble the only CPU module and bottom plate
before installing them on the motherboard.
CPU Module (MMO)See page 2-13.
CPU Top Plate
Note: For the
OmniBook 4150B, see
“Heatsink/Top Plate”
below.Keyboard (page 2-9). 1. For an OmniBook 4150† with a 2-screw top plate,
remove the screw from the heatsink cover and lift it
off the heatpipe.
2. Remove the 2 or 5 screws holding the CPU top
plate.
3. Remove the top plate.
Caution: Replace the top plate with one that is
compatible with the CPU module—see the table on
page 4-3.
Caution: Install conductive tape grounding straps and
conductive pads on top of the top plate—just as on the
original top plate.
Caution: For an OmniBook 4100, install a square top-
plate spacer on top of the top plate at the right-rear
corner. (Service note 4100-03C.) 
						

							2-34 Removal and Replacement HP OmniBook 4100/4150
ComponentRemoval ProceduresAdditional Steps (See figures on pages 4-2, 4-8)
DC-DC PCAPlug-in module (page 2-3).
Hard drive (page 2-5).
Keyboard (page 2-9).
Display (page 2-11).
Top case (page 2-16).1. Remove the screw from the IR PCA and move the
PCA aside.
2. Remove the two screws from the right frame and
remove the frame.
3. Unplug the DC-DC PCA.
Fan
Caution: Do not spin
the fan blade with your
finger. Pressure on the
fan blade can damage
the bearings.Keyboard (page 2-9).
Display (page 2-11).1. Unplug the fan cable from the motherboard.
2. Remove the screw from the plastic cover. On an
OmniBook 4150B, remove the other screw holding
the fan.
3. Lift out the cover and fan - they are a single
assembly on an OmniBook 4150B.
Reassembly Notes: For an OmniBook 4100 or 4150†,
route the fan wires at the bottom of the opening next to
the motherboard.
Frame, LeftPlug-in module (page 2-3).
Hard drive (page 2-5).
Keyboard (page 2-9).
Display (page 2-11).
Top case (page 2-16).1. Remove the 1 or 2 screws holding the heat
exchange cover/fan.
2. Lift off the cover/fan and move them aside.
3. For a 2-screw CPU top plate, remove the screw
from the heatsink cover and remove the cover.
4. Remove the 2 or 5 screws from the CPU top plate
and remove the top plate.
5. Remove the screw holding the frame to the
motherboard and remove the frame.
Frame, Left or RightPlug-in module (page 2-3).
Hard drive (page 2-5).
Keyboard (page 2-9).
Display (page 2-11).
Top case (page 2-16).1. Remove the screw holding the IR PCA to the frame
and move the PCA aside.
2. Remove the two screws holding the frame and
remove the frame.
Heatsink Parts
(OmniBook 4100/4150†)
Caution: For the
OmniBook 4100, the
finned heatsink and
heatsink cover must
match the screw size
(M2 or M3).Keyboard (page 2-9).
Display (page 2-11).·  Heat exchange cover: Remove the screw from the
plastic cover and remove it from the frame.
·  Heatsink cover (present only on an OmniBook with a
2-screw CPU top plate): Remove the screw from the
cover and remove it from the heatpipe.
·  Finned heatsink: Remove the top case (page 2-16).
Remove the screw holding the heat exchange cover
to the frame and remove the cover. Lift off the fan
and move it aside. For a 2-screw CPU top plate,
remove the screw and heatsink cover. Remove the 2
or 5 screws from the CPU top plate and remove the
top plate. Remove the screw from the left frame and
lift off the frame. Then lift out the finned heatsink.
Heatsink/Top Plate
(OmniBook 4150B)Keyboard (page 2-9). Remove the 5 screws from the heatsink/top plate and
lift it off.
IR PCADisplay (page 2-11). Remove the screw from the IR PCA, then unplug the
cable from the motherboard.
LVDS PCA
(not present in
OmniBook 4150B)Keyboard (page 2-9).
Display (page 2-11).Use a probe to unplug the LVDS PCA from the VGA
PCA.
Caution: The LVDS PCA must be compatible with the
LCD module. See the compatibility table on page
2-13. 
						

							HP OmniBook 4100/4150 Removal and Replacement 2-35
ComponentRemoval ProceduresAdditional Steps (See figures on pages 4-2, 4-8)
Module Latch, LeftPlug-in module (page 2-3).
Hard drive (page 2-5).
Keyboard (page 2-9).
Display (page 2-11).
Top case (page 2-16).1. Remove the 1 or 2 screws holding the heat
exchange cover/fan.
2. Lift off the cover/fan and move them aside.
3. For a 2-screw CPU top plate, remove the screw
from the heatsink cover and remove the cover.
4. Remove the 2 or 5 screws from the CPU top plate
and remove the top plate.
5. Remove the screw holding the frame to the
motherboard and remove the frame.
6. Lift off the latch and spring.
Reassembly Notes: See the picture on page 2-28.
Module Latch, RightPlug-in module (page 2-3).
Hard drive (page 2-5).
Keyboard (page 2-9).
Display (page 2-11).
Top case (page 2-16).1. Remove the screw from the IR PCA and move the
PCA aside.
2. Remove the two screws from the right frame and
remove the frame.
3. Lift off the latch and spring.
Reassembly Notes: See the picture on page 2-28.
MotherboardSee page 2-19.
PCMCIA SocketKeyboard (page 2-9). Remove the four screws from the PCMCIA socket and
unplug it from the motherboard.
Speaker, LeftPlug-in module (page 2-3).
Hard drive (page 2-5).
Keyboard (page 2-9).
Display (page 2-11).
Top case (page 2-16).1. Remove the 1 or 2 screws holding the heat
exchange cover/fan.
2. Lift off the cover/fan and move them aside.
3. For a 2-screw CPU top plate, remove the screw
from the heatsink cover and remove the cover.
4. Remove the 2 or 5 screws from the CPU top plate
and remove the top plate.
5. Remove the screw holding the frame to the
motherboard and remove the frame.
6. Unplug the speaker wires and remove the speaker.
Speaker, RightPlug-in module (page 2-3).
Hard drive (page 2-5).
Keyboard (page 2-9).
Display (page 2-11).
Top case (page 2-16).1. Remove the screw from the IR PCA and move the
PCA aside.
2. Remove the two screws from the right frame and
remove the frame.
3. Unplug the DC-DC PCA.
4. Unplug the speaker wires and remove the speaker.
Speaker CoverOn the front corner of the case, slide the latch forward.
Then slide the speaker cover forward slightly, swing it
outward about 2 cm, then pull firmly until it unsnaps
from the case.
Reassembly Notes: If the slider came off the latch,
attach it to the latch before you install the cover.
Spring, GroundingDisplay (page 2-11). Remove the spring form the hole at the back of the left
or right frame. 
						

							2-36 Removal and Replacement HP OmniBook 4100/4150
ComponentRemoval ProceduresAdditional Steps (See figures on pages 4-2, 4-8)
VGA PCAKeyboard (page 2-9).
Display (page 2-11).1. Unplug the touch-pad cable from the VGA PCA.
2.On an OmniBook 4100 or 4150†, use a probe to
unplug the LVDS PCA from the VGA PCA.
3. On the back of the unit, remove the two standoffs
from the VGA connector.
4. Unplug the VGA PCA from the motherboard.
Caution: For an OmniBook 4150B, you must set the
switches on the PCA according to the type of LCD
module in the computer—see the table on page 2-13.
Reassembly Notes: For an OmniBook 4150† with
serial number TW 924xxxxx, install a rubber VGA
spacer on the top of the PCA at the front-left corner.
(Service note 4150-11.)
† Models called 4150† in this manual have no marking in the serial number, whereas models called 4150B
have 4150 B after the serial number. 
						

							HP OmniBook 4100/4150 Troubleshooting and Diagnostics 3-1
3 
Troubleshooting and Diagnostics
This chapter includes troubleshooting and diagnostic information for testing the functionality of the
OmniBook and identifying faulty modules:
 · Troubleshooting information
  Troubleshooting the problem (page 3-2).
  Verifying the repair (page 3-3).
  Suggestions for troubleshooting (page 3-4).
 · Diagnostic tools
  OmniBook hardware diagnostic program (page 3-13).
  Power-on self-test (page 3-20).
  Sycard PCCtest 450 PC Card (page 3-23).
  Desktop Management Interface (page 3-23).
  BIOS Setup utility (page 3-26).
 
Caution
 
For an OmniBook 4150 Series model, do not unnecessarily remove the CPU module from the
motherboard. The CPU connector is easily damaged during removal and insertion. 
						

							3-2 Troubleshooting and Diagnostics HP OmniBook 4100/4150
Troubleshooting
The suggestions in this section can help isolate and repair the cause of a problem. To ensure quality
repair, HP recommends that you follow the basic troubleshooting steps shown in the illustration
below.
 
 Figure 3-1. Basic Troubleshooting Steps
Troubleshooting the Problem
Record pertinent information about the unit:
  Model and serial number.
  Operating system and version.
  BIOS version.
  Accessories and peripherals used.
Analyze the problem:
 · 
Observe Symptoms. Using the customer’s information, try to duplicate the problem. Determine
how the problem differs from proper behavior. Also, take note of the functions that do work
properly.
Check the customers description
of the problem and any supporting
information.
Try to duplicate the customers
problem.
Troubleshoot the problem using
  - Diagnostic tools.
  - Troubleshooting suggestions.
Verify the repair by testing the
functionality of the complete unit .