Hitachi 43FWX20B, Training

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DP-2X MICROPROCESSOR DATA COMMUNICATIONS CIRCUIT EXPLANATION
PAGE 02-03
ON THE TERMINAL PWB: (Through the connector PST2)
A/V Selector IX01
The A/V Selector IC is responsible for selecting the input source for the Main Picture as well as the source for
the PinP or Sub picture. Communication from the Microprocessor via pins (
30 SDA1 and 29 SCL1 ) to the PST2
connector pins ( 5 and 4 ) respectively then to IX01 pins ( 34 and 33 ) respectively.
Main Video Chroma IZ02
The Main Video Chroma IC processes the video and chroma from the 3D Y/C circuit for the main picture. It re-
ceives the Y and chroma and prepares it for the Flex Converter by outputting Y Cr/Cb (NTSC Only). Communi-
cation from the Microprocessor via pins (
31 SDA2 and 28 SCL2 ) to connector PST2 pins ( 2 and 1 ) then to IZ02
pins ( 13 and 14 ) respectively.
Sub Video Chroma IZ01 (PinP)
The PinP Video Chroma IC processes the video and chroma from the 2 Line Comb filter circuit for the Sub pic-
ture. It receives the Y and chroma and prepares it for the Flex Converter by outputting Y Cr/Cb (NTSC Only).
Communication from the Microprocessor via pins (
31 SDA2
and
28 SCL2
) to connector
PST2
pins (
2
and
1
)
then to IZ02 pins ( 13 and 14 ) respectively.
Y Pr/Pb Selector IX02
Any input that is not already in the Y Pr/Pb or Y Cr/Cb state, will have be converted to this state by
I501
.
The Main Y Pr/Pb Selector IC selects the appropriate input between the Tuner, AV Inputs, S-Inputs or Compo-
nents. Communication from the Microprocessor via pins (
31 SDA2 and 28 SCL2 ) to connector PST2 pins ( 2 and
1
) to
IX04
pins (
31
and
30
) respectively.
3D Y/C IW01
(IC mounted directly on the Terminal PWB).
The 3D Y/C IC is a Luminance/Chrominance separator, as well as a 3D adder. Separation takes place digitally.
Using advanced separation technology, this circuit separates using multiple lines and doesn’t produce dot pattern
interference or dot crawl. The 3D effect is a process of adding additional emphasis signals to the Luminance and
Chrominance. These signals relate specifically to transitions. Transitions are the point where the signal goes from
dark to light or vice versa. The 3D adds a little more black before the transition goes to white and a little more
white just before it gets to white. It also adds a little more white just before it goes dark and a little more dark just
before it arrives. This gives the impression that the signal pops out of the screen or a 3D effect.
The Microprocessor communicates with the 3D Y/C IC via I
2
C bus data and clock. The communications ports
from the Microprocessor are pins (
31 SDA2
and
28 SCL2
) to connector
PST2
pins (
2
and
1
) to the 3D Y/C
IW01 pins ( 60 and 59 ) respectively.
The Microprocessor also is able to turn on and off circuits within the 3D Y/C circuit determined by customer
menu set-up.
DP-26 MICROPROCESSOR DATA COMMUNICATIONS DIAGRAM
The DP-26 has the addition of the Digital Module (ATSC Tuner).