Mitsubishi V19-V21, Tehnical Manual

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7-3
PCB-SIGNAL Video/Color Path
Main Picture Signal Path
Figure 7-2 shows the Overall Video/Color Signal
Path on the PCB-SIGNAL. NTSC main picture sig-
nal from the A/V SW circuitry is routed through PCB-
SIGNAL to PCB-3DYC.
The Comb Filter on the PCB-3DYC separates the Y
and C signals, and the Main Decoder converts the Y
and C signals to YCbCr. The signals are then di-
rected to YCbCr Select circuitry on the PCB-SIG-
NAL.
The Main YCbCr Select circuit selects signals from
the Main Decoder, or the Component, DTV or the
VGA inputs. The selected signals can be:
• 480i – YCbCr are directed to PCB-2HDW
and CbCr to the DM Module. The 480i Y
signal, directly from PCB-3DYC, is routed
to the DM Module.
• 480p – YCbCr are directed to the VCJ and
2HDW. 2HDW circuitry only processes
480p when there is a display format change.
• 1080i – YCbCr are directed to the VCJ
The 480i Y signal for both the DM Module and the
Monitor Outputs must include sync signals. Since
the Main Decoder strips sync from the Y signal, it
must be directed to the DM and Monitor Outputs
before Main Decoder processing.
The PCB-2HDW doubles the number of horizontal lines
in 480i signals. The output signals from 2HDW, Y-