HP Omnibook 4100 4150 Service Manual

							HP OmniBook 4100/4150 Product Information 1-15
 Table 1-13. Functional Structure
BootupCPU module
Motherboard
BIOS IC
Floppy disk module
Hard disk driveMain processor (MMO).
Primary system circuitry.
Code for basic system functions (part of motherboard on OB 4150).
First source of disk-based startup code.
Second source of disk-based startup code.
ProcessorCPU module
MotherboardMain processor, numeric data processor, L1 and L2 cache.
Primary system circuitry.
MemoryMotherboard
RAM board
VGA PCANo onboard RAM (OB 4150), or first 32 MB of RAM (OB 4100).
Changeable RAM (1 slot on OB 4100, 2 slots on OB 4150).
Video RAM.
PowerBattery
Motherboard
DC-DC PCA
AC adapterPower storage.
AC adapter socket, power switch, lid switch, system-off switch, power
supply.
Power control circuitry.
AC-to-dc converter.
DisplayMotherboard
LCD module
Inverter PCA
LVDS PCA
VGA PCAPCMCIA/zoomed video controller.
Display output, backlight.
Power converter for backlight.
Display drivers, LVDS processing (OB 4100/4150†).
Display/graphics controller, video RAM (OB 4150B: LVDS processing).
Hard diskMotherboard
Hard disk driveHard disk controller.
Hard disk mechanism.
Floppy driveMotherboard
Floppy disk moduleI/O controller, floppy connector.
Floppy disk mechanism.
KeyboardMotherboard
BIOS IC
KeyboardKeyboard controller.
Keyboard BIOS (part of motherboard on OB 4150).
Key switches.
PointerMotherboard
BIOS IC
Keyboard
Top caseKeyboard controller, pointing stick controller (PS/2 output).
Keyboard BIOS (part of motherboard on OB 4150).
Pointing stick sensor.
Touch pad sensor, controller (PS/2 output).
AudioMotherboard
VGA PCA
Audio jack PCA
Inverter PCA
SpeakersAudio controller (OB 4100/4150B), audio decoder, speaker amplifier,
headphone amplifier, zoomed video controller, mute switch.
Audio controller (OB 4150†).
External audio jacks.
Microphone.
Speakers.
StatusMotherboard
LED strip cable
VGA PCAKeyboard controller, plus keyboard LEDs (OB 4150).
Main LEDs.
Keyboard LEDs (OB 4100).
SerialMotherboard I/O controller, serial connector.
ParallelMotherboard I/O controller, parallel connector.
InfraredMotherboard
IR PCAI/O controller.
Infrared transmitter/receiver.
PS/2 portMotherboard Keyboard controller, PS/2 connector.
USBMotherboard Bus controller (South Bridge), USB connector.
Docking portMotherboard Docking logic, docking connector.
PCMCIAMotherboard
PCMCIA socketPCMCIA controller.
PCMCIA connectors.
† 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 Removal and Replacement 2-1
2 
Removal and Replacement
This chapter tells you how to remove and replace the following components and assemblies. The ones
marked by 
· are user-replaceable.
 Table 2-1. Removal Cross-Reference
 
 Air vent cover (table on page 2-33).
 Audio jack cover (table on page 2-33).
 Audio jack PCA (table on page 2-33).
 · Battery (page 2-3).
 BIOS IC (page 2-28).
 Bottom case (page 2-19).
 Cable holder (table on page 2-31).
 CPU bottom plate (table on page 2-33).
 CPU module (page 2-13).
 CPU top plate (table on page 2-33).
 DC-DC PCA (table on page 2-33).
 Display bezel (table on page 2-31).
 Display case (table on page 2-31).
 Display latch (table on page 2-31).
 · Docking door (table on page 2-8).
 End cap (table on page 2-31).
 Fan (table on page 2-33).
 · Foot (table on page 2-8).
 Frame (table on page 2-33).
 · Hard disk drive (page 2-5).
 Heatsink parts (table on page 2-33).
 Hinge (table on page 2-31).
 · Hinge cover (table on page 2-8).
  
 Inverter PCA (table on page 2-31).
 · I/O door (table on page 2-8).
 IR PCA (table on page 2-33).
 Keyboard (page 2-9).
 LCD brackets (table on page 2-31).
 LCD flex cable (table on page 2-31).
 LCD module (page 2-13).
 LCD shield (table on page 2-31).
 LED strip cable (table on page 2-31).
 LVDS PCA (table on page 2-33).
 Module latch (table on page 2-33).
 Motherboard (page 2-19).
 PCMCIA socket (table on page 2-33).
 · Plug-in module (page 2-3).
 · RAM board (page 2-4).
 · RAM/BIOS cover (table on page 2-8).
 Speaker cover (table on page 2-33).
 Speaker (table on page 2-33).
 Spring, grounding (table on page 2-33).
 Strip cover (table on page 2-32).
 Top case (page 2-16).
 · VGA connector cover (table on page 2-8).
 VGA PCA (table on page 2-33).
 
  Caution
 
Always provide proper grounding when performing repairs. W ithout proper
grounding, an electrostatic discharge may damage the OmniBook and its
components. 
						

							2-2 Removal and Replacement HP OmniBook 4100/4150
  Notes
 
Reassembly steps are the reverse of the removal steps. Reassembly notes are included at the
end of each section below.
 
Symbols like this throughout this chapter show approximate full-size screw outlines. You
can use them to verify the sizes of screws before you install them. Installing a wrong-size screw
can damage the unit. (The symbol at the left represents an M2.5×5mm T-head screw.)
 Table 2-2. Required Equipment
 · Small Phillips screwdriver, preferably magnetized.
 · 5 mm hex driver.
 · Pointed knife or probe.
 · Small flat-blade screwdriver.
 · IC (PLCC) removal tool (similar to OK Industries EX-5).
 · OmniBook 4150† CPU removal tool (HP part number T-335665).
 Table 2-3. Recommended Screw Torques
Screw Thread SizeTorque (kgf•cm)Torque (lbf•in)
M21.3 – 1.8 1.1 – 1.5
M2.5 (4–5 mm long) 3.0 – 3.5 2.6 – 3.0
M2.5 (16–19 mm long) 2.5 – 3.0 2.2 – 2.6
M3 3.0 – 3.5 2.6 – 3.0 
						

							HP OmniBook 4100/4150 Removal and Replacement 2-3
Removing the Battery or Plug-In Module
(User-Replaceable)
Required Equipment
 · None.
Removal Procedure
 1. Unplug the ac adapter, if present.
 2. Slide forward the module latch slider on the corner next to the module, then swing back the latch
to loosen the module.
 3. Pull out the module.
 4. Slide the latch back into the case.
 
 Figure 2-1. Removing the Battery or Plug-In Module
Reassembly Notes
 · Important: You must slide the latch forward before you can insert a module.
 · You can install a battery in either bay. Any other type of module must be installed in the left bay. 
						

							2-4 Removal and Replacement HP OmniBook 4100/4150
Removing a RAM Board
(User-Replaceable)
The OmniBook 4100 has 32 MB of RAM on the motherboard and has one RAM slot for installing
additional RAM. The OmniBook 4150 Series has no RAM on the motherboard and has two RAM
slots for installing RAM.
 Table 2-4. RAM Board Replacement Part Numbers
DescriptionPart NumberExchangeOmniBook
Part Number4150B4150†4100
RAM board, 32-MB SDRAM (66 MHz) 1818-7413 F1456-69001
··
RAM board, 64-MB SDRAM (66 MHz) 1818-7414 F1457-69001
··
RAM board, 128-MB SDRAM (66 MHz) 1818-7549 F1622-69001
··
RAM board, 32-MB SDRAM (100 MHz) 1818-7950
···
RAM board, 64-MB SDRAM (100 MHz) 1818-7951
···
RAM board, 128-MB SDRAM (100 MHz) 1818-7952
···
† Models called 4150† in this manual have no marking in the serial number, whereas models called
4150B have 4150 B after the serial number.
  Caution
 
Handle the RAM board only by its edges and provide proper grounding. Otherwise, you may
damage the board due to electrostatic discharge.
Required Equipment
 · Small Phillips screwdriver.
Removal Procedure
 1. Unplug the ac adapter, if present, and remove the battery.
 2. Turn the unit bottom side up, then remove the two screws from the RAM/BIOS cover and remove
the cover.
 3. Release the two latches at the sides of the RAM board, so the free edge of the board pops up.
 4. Pull the board out of the connector.
 
 Figure 2-2. Removing a RAM Board
Note:
OmniBook 4100 shown. For the
OmniBook 4150 Series, there are
two RAM slots (with no RAM built
into the motherboard). 
						

							HP OmniBook 4100/4150 Removal and Replacement 2-5
Reassembly Notes
 · Insert the RAM board into the connector at about a 30° angle until it is fully inserted. Then press
down at both sides until both latches snap closed.
Removing the Hard Disk Drive
(User-Replaceable)
 Table 2-5. Hard Disk Drive Replacement Part Numbers
DescriptionPart NumberExchangeOmniBook
Part Number4150B4150†4100
Drive, hard disk (4.0GB, 12.7mm, IBM) 0950-2671 F1386-69100
·
Drive, hard disk (4.0GB, 12.7mm, Toshiba) 0950-2865 F1386-69101
·
Drive, hard disk (4.3GB, 9.5mm, IBM) 0950-3409 F1711-69100
··
Drive, hard disk (4.8GB, 9.5mm, IBM) * 0950-3611 F1711-69102
···
Drive, hard disk (6.4GB, 9.5mm, IBM) * 0950-3442 F1711-69101
···
Drive, hard disk (6.4GB, 12.7mm, IBM) 0950-2785 F1475-69100
··
Drive, hard disk (6.4GB, 8.4mm, Toshiba) 0950-3675 F1475-69102
···
Drive, hard disk (6.4GB, 12.7mm, Toshiba) 0950-3397 F1475-69101
··
Drive, hard disk (10.1 GB, 12.5mm, IBM) * 0950-3443 F1744-69101
··
* These hard drives are the preferred drives at the time of publication. Drives shipped in units are
subject to change without notice. For current information about preferred and approved drives for
these products, see the latest version of service note HDD-01.
† Models called 4150† in this manual have no marking in the serial number, whereas models called
4150B have 4150 B after the serial number.
Required Equipment
 · Small Phillips screwdriver.
 · Small flat-blade screwdriver.
Removal Procedure
 1. Unplug the ac adapter, if present, and remove the battery.
 2. Turn the unit bottom side up.
 3. Remove the hard drive screw from the bottom case.
 4. Pull out the hard drive by its plastic tab.
 
 
 Figure 2-3. Removing the Hard Disk Drive
Screw, M3×4mm 
						

							2-6 Removal and Replacement HP OmniBook 4100/4150
 5. If you are installing a new hard drive that does not have a cover, you can remove the cover parts
from the old hard drive:
 · Remove the screw from the case, then pry open the flap. If necessary, use a flat-blade
screwdriver
 · Use a flat-blade screwdriver to pry open the snaps at the ends of the case, then open the
connector-side of the case.
 · Pry out the corner next to the connector, then lift out the connector and hard drive together.
 · Unplug the internal connector and cable from the hard drive.
 
 Figure 2-4. Installing a Hard Drive in the Cover
Reassembly Notes
  Caution
 ·  Do not cover the vent hole in the top surface of the hard drive or in the case. If you cover the
hole, the hard drive could fail prematurely.
 ·  If you install a 9.5-mm hard drive in the case, make sure you install the spacer on top of the
drive. If you install an 8.4-mm hard drive, make sure you stick the end spacer on the case and
install the top spacer on top of the drive.
 · Pry out the connector corner of the case and insert the external connector and hard drive at the
same time. The connector seats in the lower part of the opening in the case.
 · Secure the two tabs on the screw flap by inserting the corner tab last, while prying out the nearby
corner of the case.
 · When you install the battery module, be sure the plastic tab on the hard drive case lays folds up
against the front of the case.
Screw, M3×4mm
HDD cover kit
Spacers for 8.4mm HDD
(see Caution)Spacer for 9.5mm HDD
(see Caution) 
						

							HP OmniBook 4100/4150 Removal and Replacement 2-7
  Important
 ·  If you are installing a new hard drive, create a Hibernate partition on the drive before loading
any software—see the steps below.
Creating a Hibernate Partition – OmniBook 4100
 1. If you do not have an OmniBook Recovery CD and internal CD-ROM (or DVD) module for the
computer you are repairing, create a Support Utility floppy disk now.
 After inserting a formatted floppy disk in the floppy drive, do one of the following:
  On an OmniBook 4100 with a Spring-98 factory software installation, click Start, Programs,
OmniBook, Create Support Utility Disk.
  On any computer that has a CD-ROM drive, run makesupp from the
\Omnibook\Drivers\Hputils directory on the OmniBook 4100 Recovery CD.
 2. Insert the Recovery CD in the CD-ROM drive—or insert the Support Utility disk in the floppy
drive.
 3. Reboot the computer. If you are using the Recovery CD, press ESC during reboot to cancel the
OmniBook screen, ESC to display the boot-device menu, then select the CD-ROM drive as the
boot device.
 4. When prompted, select “Create Hibernate Partition.”
 We recommend that you create a partition the same as the default option.
Creating a Hibernate Partition—OmniBook 4150 Series
 1. Plug in the ac adapter.
 2. Insert the Recovery CD in the CD-ROM drive.
 3. Shut down and restart the computer—when you see the HP logo, press ESC two times.
 4. Select the CD-ROM drive as the boot device.
 5. When the Recovery CD dialog box appears, follow the displayed instructions. Accept the
recommended partition size. If you install the factory software, the recovery process can take up
to 10 minutes.
 If you want to create the Hibernate partition without installing the factory software, click
Advanced and select the option to not install the operating system. If you intend to install
Windows NT, you should choose the FAT16 option or the Hibernate-only option.
 Note: If, instead, you see an MS-DOS menu of options, select “Recover...” to create the
Hibernate partition and install the factory software, which can take up to 60 minutes. Or select
“Create Hibernate Partition” to not install the software. Accept the recommended partition size.
 6. When prompted to reboot the computer, press CTRL+ALT+DEL and follow any displayed
instructions. 
						

							2-8 Removal and Replacement HP OmniBook 4100/4150
Replacing Small Parts
(User-Replaceable)
The following small parts are user-replaceable.
 Table 2-6. Replacing Small Parts (User-Replaceable)
PartReplacement Procedure
Docking DoorsOpen each door and flex the door until one side tab releases. To replace, see the
picture on page 2-28.
FeetInsert a small flat-blade screwdriver under the foot and pry it loose. To replace, firmly
press the adhesive side of the foot into the recess.
Hinge Cover, LeftW ith the display lid fully open, push back on the bottom edge of the hinge cover until
it unsnaps, then work it loose and lift it off. To install, make sure the front and back
tabs snap into the case.
Hinge Cover, RightW ith the display lid closed, push in the bottom of the hinge cover until it unsnaps,
then work it loose and lift it off. To install, make sure the front and back tabs snap
into the case.
I/O DoorW ith the door closed, insert a small flat-blade screwdriver behind the door from
below. Flex the door until one side tab releases. It helps to press in lightly on the
ends of the door. To install, keep the icons on the door toward the top.
Pointing Stick CapPull the cap off the pointing stick.
RAM/BIOS CoverOn the bottom of the unit, remove the two screws from the RAM/BIOS cover and
remove the cover.
VGA Connector CoverW ith the display closed, push up on the connector cover and down on the bottom
case until the lower tabs release. To install, insert the top tabs into the strip cover,
then push up on the cover and down on the bottom case until you can insert the
lower tabs.