Daewoo DT-4220NH Service Manual page 19

Description of A/V(MAIN and SUB PCB) and POWER
4-2-2. TV signal
Tuner(PC901) receives antenna signal and outputs CVBS and sound signal. IC102 switches out the
CVBS and the rest of the signal flow is same as composite video signal flow mentioned earlier.
- Main IC
A. PC901: Tuner (Input: antenna signal Output: CVBS)
B. IC102: Switching IC (Input: CVBS Output: CVBS)
C. IC126: Teletext IC
D. IC132: Video processor (Input: Y/C Output: 16bit digital, HV)
E. IC134: Deinterlacer (Input: 16bit digital, HV Output: 24bit digital RGB, HV)
F. IC140: Image Processor (Input: 24bit digital RGB, HV Output: 24bit digital RGB, HV)
- Main TP (Input: Color Bar Pattern)
TP143, 145
TP181, 184, 187, 188
4-2-3. DTV/DVD signal
Both DTV(Y, Pb, Pr) and DVD(Y, Cb, Cr) share same jack and signal path. IC102 switches out
signal and also detects type of signal so that IC121 can convert the analog signal to digital. Then
the signal goes through IC134(deinterlacer) and IC140 for digital image processing.
- Main IC
A. IC102: Switching IC (Input: Component Output: Component, HV)
B. IC121: A/D converter (Input: Component, HV Output: 24bit digital RGB, HV)
C. IC134: Deinterlacer (Input: 24bit digital RGB, HV Output: 24bit digital RGB, HV)
D. IC140: Image Processor (Input: 24bit digital RGB, HV Output: 24bit digital RGB, HV)
TP188: Clock for display (output of IC140)
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