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1-14 Product Information HP OmniBook 4100/4150
Internal Design
The motherboard PCA is the central component of the OmniBook design. It plays a role in virtually
all system functions. The CPU module (MMO) and most other subsystems connect to the
motherboard.
The following figure shows the connections among the replaceable electrical modules. As a substitute
for a functional block diagram, see the table on page 1-15—it lists the roles that the replaceable
modules play in each of the functional subsystems.
PCMCIA
Cards
CPU
Module
Audio Jack
PCA
DC-DC
PCA
Main
Battery
Keyboard
(pointing stick)
RAM
Board
LVDS
PCA
VGA PCA
LCD Module
Top Cas e
(touch pad support)
Motherboard
PCA
BIOS
IC
Hard Disk
Drive
Fan
Speaker Speaker
Plug-In
Module
or Battery
IR
PCA
Inverter PCA
(microphone)
LED Strip
PCMCIA
Socket
Figure 1-4. Replaceable Module Diagram
The BIOS IC is not
removable on the
OmniBook 4150 Series.
Two RAM slots are
available on the
OmniBook 4150 Series.
The power switch and lid
switch are contained on
the motherboard.
All external connections
(except IR and audio) are
made to the motherboard.
Keyboard cable connects to
VGA PCA (OmniBook 4100) or
motherboard (OmniBook 4150
Series).
LVDS PCA is not present in the
OmniBook 4150B.