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4-8
The PerfectColor feature is performed in the Doubler
circuit, therefore all signal sources must pass through
the Doubler. With DM signal sources, any OSD is al-
ready inserted in the signal before it goes to the Dou-
bler. The PerfectColor circuitry can cause incorrect color
in the OSD. The DM-BLK signal is directed to the
Doubler when the source is Digital, momentarily dis-
abling the PerfectColor during the OSD.
Flash Circuit
Figure 4-9 shows the Flash Circuit in the V23. This
circuit is not controlled by the µPCs, but can be consid-
ered a status sensor. It prevents a momentary flash on
the screen:
• When the TV is switched Off (PON-1 goes
Low)
• If AC power is lost. (AC-OFF goes High)
• If the +24V supply is lost (Q7C11 conducts)
If any of the above occurs, drive to the HV circuit is
removed to prevent any flash on the screen. The Flash
line goes High, turns On Q2V41, which removes HV
Drive.