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Description of A/V(MAIN and SUB PCB) and POWER
4-2. Overview
A/V block (Main and Sub PCB) is Multi Media circuit board that can process various input signals
such as video, component, PC, DVI, and analog TV signal. It is mainly composed of switching,
sync processing, decoding, analog TV, digital image processing, and system control part
4-2-1. Composite video, Y/C(S-Video) and SCART (CVBS, RGB) composite video
Y/C(S-Video) and SCART(CVBS) have similar signal paths, IC102 receives these signals
and swithes out a selected signal. Then the signal goes into IC132 for video processing,
SCART(RGB) signal goes directly into IC132. The output of IC132 goes through IC134 and
IC140 for deinterlacing and digital image processing respectively.
- Main IC
A. IC102: Switching IC (Input: analog inputs Output: an analog output)
B. IC126: Teletext IC
C. IC132: Video processor (Input: Y/C, CVBS Output: 16bit digital, HV)
D. IC134: Deinterlacer (Input: 16bit digital, HV Output: 24bit digital RGB, HV)
E. IC140: Image Processor (Input: 24bit digital RGB, HV Output: 24bit digital RGB, HV)
- Main TP (Input: Color Bar Pattern)
TP145: Brightness signal (input to IC132)
TP143: Color signal (input to IC132)
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