Internal Battery Pack; Power Board; Lcd Inverter Board Assembly - NEC Versa 2500 Series Service Manual

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Hardware Functional Overview

3-11

Internal Battery Pack

The NEC Versa 2500 Series notebooks utilizes NiMH (Nickel Metal-Hydride) that pro-

vides DC power for the notebook

The battery pack contains ten size A battery cells that provide the system with 12V. When

installed in the notebook, the battery LED automatically appears and will also start to re-

charge whenever the AC adapter is connected to the notebook.

Normal charging time for the battery pack is around 1.5 hours when the computer is turned

off while it should take around 6 hours maximum when the computer is running.

The power board receives approximately 12VDC from the battery pack and uses this input

voltage to generate +12V, +5V, +3.3V, (+3.45V) regulated output voltages to provide

power for all internal notebook board assemblies. The output of the +5V regulator also

drives the LCD inverter circuit on the LCD inverter board assembly. Refer to Chapter 2 for

more detailed information.

The LCD Inverter Board Assembly, located in the LCD Panel Assembly, converts the

+5VDC input from the Power Board module of the system board into a high voltage AC

output used to light the CCFT (Cold-Cathode Fluorescent Tube).

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