Daewoo DPN-4274NHS Service Manual - page 17
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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 and Y/C(S-Video)
Composite and Y/C have similar signal path. IC102 takes 2 composite inputs and 2 S-video
inputs. The switched composite video signal goes into IC130 and then to IC132. The
switched Y/C signal is directly inputted to IC132. One of composite video signal or Y/C goes
through IC134 for deinterlacing and IC140 for digital image processing.
- Main IC
A. IC102: Switching IC (Input: analog inputs Output: an analog output)
B. IC130: 3D Y/C separator (Input: NTSC CVBS Output: Y/C)
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)