E-Box Video Signal Flow - Philips FTV1.9 Training Manual

E-BOX VIDEO SIGNAL FLOW (Figure 33)
Video from the Tuner, Front Jack panel, and YUV panel is fed to the Global I/O Panel (Jack panel).
The Global I/O panel selects between the Tuner, Front Jack panel, YUV panel, or AV inputs on the
I/O panel. Composite Video or YC for the main picture is fed to the Comb Filter panel. YC from the
Comb Filter panel is fed to the Signal Processor panel. The Decoder in 7352 converts the YC to a
YUV signal which is fed to the Double Window circuit. Selected PIP video is also fed to the DW
panel from the Global I/O panel. The Double Window panel the outputs YUV to the Feature board.
The Feature Board has a line doubler. The signal is also digitally processed to change the picture to
the Aspect Ratio selected by the user. YUV at two time Horizontal is then fed to the Signal
Processor IC 7500. If the User selects the HD signal from the HD Interface panel, this signal is fed
to 7500. 7500 selects between the output of the Feature board or the HD Interface panel. The
Matrix circuit in 7500 converts the YUV signal to the RGB outputs, R-VC, G-VC, and B-VC. 7500
also changes the Brightness and Contrast of the RGB outputs.
RGB from the SSB is fed to the AVB panel. (Figure 34) RGB from the SSB is fed to the switch 7800
which selects between RGB from the SSB or RGB from a Computer connected to VGA in. If the
VGA In is selected the OSD from the Plasma Display is active. If RGB from the SSB is selected the
OSD comes from the E-Box. 7700 switches Horizontal and Vertical sync to the RGB output. If the
Microprocessor detects the Plasma Panel, the Monitor Present line switches the RC5 from the E-
Box to the Plasma Display.
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