Acer P221W - Circuit Operation Theory

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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