Panasonic TH-42PX20U Service Update Information page 16

Main and Sub Video signals are amplified and applied to another video switching
IC, IC4302.
The component video signals Y, Pb, and Pr are also input to IC4302 via the
connectors located at the rear of the cabinet.
The DVI input connector, attached to the DG Board, supplies the DVI signal to
the DVI receiver where it undergoes serial to parallel conversion. The output of
the DVI receiver is converted to a Y, Pb, and Pr component signal and then
applied to pins 14, 16, and 18 of IC4302 via pins 415, 116, and 316 of connector
H1/DG1. IC4302 selects between NTSC, Component, and DVI video input
signals. The selected signals can be in any of the three formats; Video, Y/C, or Y,
Pb, Pr. The main signal is output via pins 43, 44, and 46 of IC4302. The signals
are amplified and output to the DG-Board via pins 107, 307, and 407 of the
connector H1/DG1. The Sub NTSC video signals are also amplified and output to
the DG-Board via pins 405, 206, and 406 of the same connector.
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