Circuit Operation Theory - Acer H233H Product Service Manual

6.2 Circuit Operation Theory

I. Introduction
H233H is a 23 inch and 24bits color TFT LCD monitor, which can support the resolution up to
1920x1080. It has VGA, DVI and HDMI 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
80000:1. It also offers OSD Menu for users to control the adjustable items and get some information
about this monitor.
II. Block diagram
H233H consists of a main body and a stand (base). The main body contains a
LGD/SEC 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 H233H LCD monitor
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