Panasonic TH-65PX600U Service Manual page 66

50PX60 Video Process
1. The unit contains two HDMI inputs jacks that are mounted on the DG board. The HDMI
IF receivers convert the digital signal into parallel Y, U, V data and output to the video
interface circuit for selection. The selected HDMI data is output to IC3047 for selection
among the other inputs. The selected signal is then processed by IC3047.
2. Pins 63, 65, and 67 of connector H1/DG1 provide the selected video output signals of
the H board to the DG board. On the DG- Board, the main Y/V, Pb/C, Pr signals are
converted to digital data by the analog to digital (A/D) converter circuits located inside
the Global Core IC, IC4019.
3. The comb filter in IC4019 converts the composite video signal of the main picture to Y
and C (luminance and chrominance) separated video signals. S-Video, which is already
Y/C separated, simply passes through the comb filter. The chrominance data is then
applied to the Chroma demodulator circuit that separates the color signal into Pb and Pr
data. At the completion of this process, the composite or S-Video signal is now in the
form of a digital 480i component signal. If the incoming video is in the 480p, 720P and
1080i format, the Y, Pb, and Pr signals are converted to digital only. The output of
IC4019 the is provided to the RGB processor (GC4PRO).
4. The HDMI audio signal is processed in a similar way as the video. The HDMI IF
receivers convert the HDMI audio into digital stereo data and output to the audio
interface circuit for selection. The selected digital audio is output to IC4025 for
conversion into analog. It is then amplified by IC4028 and output to the H board for
selection among the other audio inputs.
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