Video Path Block; Inputs; Main Video; Sub-Video - Sony KP-43T70 Training Manual

Video Path Block

Inputs

The two tuner outputs and the four composite/S video signals that enter
the unit are input into IC515 A/V Switch. IC515 A/V Switch switches these
video signals to three different paths. The first is the main video path,
next is the sub video path and last is the select output (not shown). The
select output is used to send a composite version of an input to any com-
posite or S video input to an output jack on the rear panel. Any compos-
ite/S video input to is selectable in the setup menu. The default setting is
to output the main video.
The Video 4 component inputs are input to IC1403 Main YUV Switch.
The Video 5 DTV inputs are input to IC511 Video Processor. They are
switched through IC511 Video Processor and input to IC1403 Main YUV
Select. IC511 Video Processor also directly outputs Video 5 480P and
1080I as RGB to the tubes.

Main Video

The main video path is used to carry composite/S Video to IC2402 3D
Comb Filter. If a composite signal is used, it is output to IC2402 3D Comb
Filter. If an S Video input is used, then the Y signal uses the same path as
the composite input. The C signal is output from IC515 A/V Switch to
IC2402 3D Comb Filter.
IC2402 3D Comb Filter is used to separate Y and C signals from a com-
posite signal input. If a Y/C signal is input, then IC2402 3D Comb Filter
will perform noise reduction and video processing functions. The C signal
is output to IC1305 Main Chroma Decoder. The Y signal is output to
IC1307 YUV Switch where it is switched through to IC1305 Main Chroma
Decoder.
IC1305 Main Chroma Decoder takes the Y and C input signals and con-
verts these signals to component video. These become the main YUV
signals are then input to IC1307 YUV Switch.
IC1307 YUV Switch switches between the main YUV signals and the in-
put it receives from IC1403 Main YUV Select. Whichever Y signal is
selected is output to IC1008 Main CPU for V Chip/CC. The V Chip/CC
Data is returned to IC1307 to be output as part of the main YUV signal.
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The outputs from IC1307 YUV Switch are then input to the BR board
(DRC) and the BM board (MID). The BR board outputs 960I signals,
which are the main video signals and are then input to IC511 Video Pro-
cessor. The BM board is used for PIP and Twin View functions and its
output is a 480P format. If the Video 5 DTV Input is 480I, it will follow the
video path out of IC1307 through the BR board and output as 960I to
IC511 Video Processor.

Sub-Video

The sub-video path is used to carry sub-video to the BM board where it is
converted for PIP and Twin-View functions. Note: The Video 5 DTV
Input cannot be used for sub video. A composite signal is input to
IC515 A/V Switch and output to CM501 Glass Comb Filter and then input
back to IC515 A/V Switch as Y and C. If the signal were an S Video input,
it would pass directly to the Y and C outputs of IC515 A/V Switch.
The C signal is input to IC1301 Sub Chroma Decoder while the Y signal is
input to IC1302 Sub YUV Switch and then switched to IC1301 Sub Chroma
Decoder. IC1301 Sub Chroma Decoder takes the Y and C input signals
and converts these signals to component video. These sub Y, U and V
signals are then input to IC1302 Sub YUV Switch.
IC1302 Sub YUV Switch is used to select between the sub YUV inputs
and the YUV input from the Video 4 component input. It also outputs the
Sub Y signal to IC1401 Sub V Chip. Sub-video OSD from the BM board
is input to the sub YUV signal. The output of IC1302 Sub YUV Switch is
output as YUV into the BM board for use with PIP and Twin View func-
tions. The signals from the BM board are input to IC511 Video Processor.
IC511 Video Processor
The IC511 Video Processor is used to switch or insert the appropriate
signals to its RGB output. These signals are the main YUV, sub YUV,
OSD RGB, PJED OSD RGB signals and DTV YUV. These signals are
converted to R, G and B to be output to the video amplifiers on each of the
C boards.