Acer V193W Product Service Manual page 60

III. Circuit Implementations:
A.) THE MAIN BODY:
A-1.) Interface board block diagram:
(a) Circuit operations:
The scaling IC has OSD and auto detecting input timing functions. OSD offers adjustable
functions to the end-users. Auto detecting timing function can detect change modes. It outputs the
digital R-G-B data, pixel clock and control signal to TCON of the LCD module. A MCU, build in
scaling IC (Realtek2525LH), is responsible for the system processing. There are two external
storing units, one is 24C16 to store the OSD function data and user preset timings.
(b) IC introduction:
1.) Realtek2525LH SCALER IC:
Realtek2525LH series products are all-in-one LCD monitor controller with analog (RGB), DVI and video
inputs, supporting UXGA/ WXSGA+WXGA+/SXGA,and integrate Realtek high performance ADC,scaling
engine,LVDS Tx,and so on.Moreover,all products are pin compatible in QFN 48-pin package to save cost and
make the design easier. The RTD also includes an ITU656 video format input port with color space converter
that makes it an attractive solution for low cost MFM and TV applications. The output section contains a 24-bit
TTL output interface and a channel LVDS transmitter for direct interfacing of commercially available LVDS LCD
panel modules. In addition, RTD2525LH embedded 16.5KSRAM dynamically stores OSD command and fonts,
- 60 -