Circuit Operation Theory - Acer P221W Product Service Manual

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6.3 Circuit Operation Theory

I. Introduction:

P221W is a 22 inch and 24bits color TFT LCD monitor, which can support the

resolution up to WSXGA+(1680x1050). It has VGA and DVI input, and compliant with

VESA specification to offer a smart power management. The monitor has DDC/CI

function to make the monitor communicate with PC by Acer ADM DDC/CI software,

and also it has ACM function to let the monitor contrast ratio up to 2500:1. It also offers

OSD Menu for users to control the adjustable items and get some information about

this monitor.

II. Block diagram

P221W consists of a main body and a stand (base). The main body contains a AUO

TFT LCD module with 4 CCFL lamps, a power board (includes AC/DC 、 DC/DC 、

inverter and panel power source), a control board and an interface board. The block

diagram is shown as below.

Fig. Block diagram for P221W LCD monitor

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