Panasonic TC-32LX70/70, Technical Manual

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TC37LZ85 Signal Circuit Block Diagram
TC37LZ85 Signal Circuit Block Diagram
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The main function of the A board is to select and process incoming video signals. Video inputs, Component
Video Input, and the composite video output of the tuner are all connected to IC3301 for selection. The video output signal of
the switch can be in any of the three analog formats: Video, Y/C, or Y, Pb, Pr. The selected output enters IC4510, the HDMI
IF Receiver/Decoder IC, for A/D conversion. The 10 bit YUV data is provided to a video switch. The HDMI receiver section of
IC4510 converts the incoming HDMI signals to YUV data and outputs to the switch. The output of the switch is provided to the
PEAKS LITE IC, IC8001.
Digital television reception of the tuner is output in the form of a transport stream (CHODATA). The transport
stream enters the DTV I/F (Interface) section of IC8001 where the video signal is extracted and converted to YUV data. The
JPEG data of the GS board enters the JPEG I/F section of IC8001 for conversion into YUV data. The internal video selector
of IC8001 (not shown in the diagram) selects and outputs the desired picture data to the Video Process circuit.
The Video Process section of the IC8001 performs all picture control operations such as brightness, contrast,
color, tint, etc. On Screen Display data such as channel numbers, Digital TV closed caption, and picture adjustments are
mixed with the video data. The output of IC8001 is provided to IC4202, the LVDS transmitter. The transmitter distributes
signals with low-jitter, while creating little noise. It reduces power consumption and the generated noise from data
transmission. Another benefit of the LVDS standard is minimal concern for cable length. The output of the LVDS transmitter is
provided to the LCD for display.