Acer X193HQL, Product Service Manual, Page: 63 / 79

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III. Circuit operation theory:
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