Chapter 5
Video/Color Circuitry
The above block diagram illustrates the Video/Color circuitry in the V23 chassis. Although initially it looks the same as in the V21, there are differences. The A/V Switch circuitry still selects main and sub picture signals from NTSC signal sources. Although it’s not apparent from the Block Diagram, the NTSC Decoders, Com- ponent Switch ICs, and the Doubler circuitry are differ- ent.
Note that all main picture sources, including the DTV Tuner, are processed by the Doubler circuitry. In the V21, 480p and DM signals only were processed by the
Doubler circuitry when a display other than Standard format was selected, or when PIP/POP was activated. The new improved Color Management (ColorPerfectTM) circuitry is in the Doubler circuitry and it now processes all signal sources. Therefore all signals must pass through the Doubler. Two additional signal sources are shown in the Block Diagram, MLink (DVI) Input, and a Memory Card Reader located in the front of the TV.
Also the diagram indicates that the Sub Picture source can only be from a NTSC source, an External Compo- nent Input or the DTV input.