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...

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...

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....

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...

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...

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...

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...

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...

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...

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....