Cpu Board; I/O Board; Sound Board - NEC VERSA 4000 Service Manual

The NEC Versa 4000 series system features the following types of LCDs.
T
TFT — 10.1-inch thin-film transistor backlit color LCD, 0.32 mm dot pitch, 18-
bit digital interface, 640 x 480 resolution, 256,000 colors.
T
DSTN — 10.4-inch dual-scan super twisted nematic color LCD, 0.33 mm dot
pitch, 16-bit digital interface, 600 x 480 resolution, 256,000 colors, (64K colors
on an external CRT).
T
High Resolution TFT — 10.4-inch thin film transistor color LCD, 0.26 mm dot
pitch, 18-bit digital interface, 800 x 600 resolution, 256,000 colors, (64K colors
on an external CRT).
In addition, the CRT port on the system's rear panel allows the user to connect an optional
monochrome or color external display to the system. The computer supports the LCD and
external display simultaneously.
Power-saving features for controlling the LCD's backlighting include the ROM-based hot
key Fn F5, and Auto Setup power management settings. See Section 2, Setup and Opera-
tion, for information on using these settings. In addition, the automatic LCD status sense
feature conserves the backlight. When the LCD is closed the backlight shuts off, saving
battery power.

CPU Board

The CPU board (75 Mhz, 90 MHz or 120 MHz) CPU board is an L-shaped board situated
next to the audio ports. In addition to the CPU, this board houses the bridge battery and
speaker. It controls important functions including power management, direct drive bus in-
terface and memory management.

I/O Board

The I/O board (G8TUP) contains peripheral subsystems including serial, parallel and video
ports. It is located underneath the sound board.
I/O board specifications are listed in Table Section 1-8 at the end of this section.

Sound Board

The sound board (G8UNA) provides the NEC Versa 4000 series system with its audio ca-
pabilities via line-in/line-out jacks, and headphone/microphone jacks. It is situated on top of
the I/O board.
Technical Information 1-3