Panasonic TH-65PX600U Service Manual page 61

42PX60 Audio/Video Process
1. GP9DU Chassis plasma televisions incorporate a Set Top Box that is designed to receive NTSC
and ATSC television broadcast. It is also used to receive QAM cable television transmission. It is
a hybrid tuner that processes NTSC and ATSC terrestrial broadcast for reproduction on the TV
screen.
2. The DT-Board in the TH-42PX600 and TH-50PX600 also incorporates the OpenCable interface
for use with a CableCard. This tuner allows the reception of Digital Cable television without the
use of a set-top-box.
3. The tuner of all GP9DU models also processes the JPEG data of the SD card used for viewing
pictures. Photo-viewer data from the GS board is input to the DT board and converted to analog
luminance and chrominance signals. Analog Television and Photo-viewer signals are output to
the H board and selected like any other source. Digital television signals (Y, U, V ) are output to
the DG board for video selection and processing.
4. The GK board, not shown in this drawing, is the operation board of the unit. The key scan pulses
are routed to the DG board MPU via the G and H boards.
5. The G board of the TH-42PX600 and TH-50PX600 contains the third video input which is
provided to the H board for selection among many other video inputs.
6. The K board contains the Remote IR sensor and the power LED.
7. The unit also contains two other video inputs, and two component inputs that are directly
connected to the main switch of the H board. The H board selects and outputs, to the DG board,
the video signal for display on the screen.
8. The DG board is responsible for the complete video processing within the unit. All analog inputs
to the DG board are immediately converted to digital. All signal processing in the DG board is
performed digitally. Signals from a digital TV source is provided directly to the DG board in digital
form.
9. The HDMI inputs jacks are now mounted on the DG board. The HDMI IF receiver converts the
digital signal into parallel Y, U, V data which is processed on the DG board.
10. The board performs PIP (Picture in Picture) and picture control operations such as brightness,
contrast, color, tint, etc. The output signal of the board passes through an LVDS (Low Voltage
Differential Signaling) transmitter for conversion into serial data. The PEAKS firmware of the unit
also resides in this board.
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