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6.2 Circuit Operation Theory
I. Introduction
The X203H is a 20” W (1600x900), LCD type is TN+Film and Normally White, 16.7M colors(R, G, B 6-
bit data + Hi-FRC data) TFT LCD with HDCP support monitor. It’s have dual (D-SUB and DVI)
interface LCD monitor with a 15 pins D-sub signal cable and 24 pin DVI signal cable which support
HDCP function. It’s compliant with VESA specification to offer a smart power management and power
saving function. It also offers OSD menu for users to control the adjustable items and get some
information about this monitor. The best function is to offer users an easy method to change input
source, DDC/CI Enable and Auto Adjustment items well done just by pressing hot key, we called it
“Input Select”, “DDC/CI” and “Auto” which can manual controlled items.
X203H also offer DDC/CI function to meet VESA standard.
II. Block diagram
The X203H consists of a LCD module with 2 lamps, a power board, a control board, and an
interface board. The block diagram is shown as below.
H E AD
Pow er B D
and
In verte r B D
L C D m od ule w ith 2 la m p s(b ack lig h t)
I/F B D
w ith
H D C P sup por t
St an d
(B ase)
A C In p u t
C T R L B D
D V I V G A
SP K
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