Hitachi 46W500 Training page 41

DP-3X CHASSIS COMPONENT EXPLANATION
FROM MAIN COMPONENT VIDEO PATH from IY04:
The following describes Main Component outputs from the Video Chroma Y Pr/Pb Switch IY04.
•
Y pin 24, to QY28, to PST2 connector pin 40, at this point the signal splits;
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To Q401 to U401 Flex Converter pin 3.
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To Q505 to I501 RGP Processor (Rainforest) pin 63.
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Pr pin 22, to QY30, to PST2 connector pin 37, at this point the signal splits;
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To Q403 to U401 Flex Converter pin 5.
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To Q507 to I501 RGP Processor (Rainforest) pin 60.
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Pb pin 23, to QY29, to PST2 connector pin 38, at this point the signal splits;
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To Q402 to U401 Flex Converter pin 4.
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To Q506 to I501 RGP Processor (Rainforest) pin 61.
Note: The reason the signal splits here is because if the signal is 1080i (540) it is sent directly into the Rain-
forest IC because it needs no conversion since it's the same frequency as the deflection circuit.
SUB COMPONENT VIDEO PATH from IV03:
The following describes PinP Component outputs from the Y Pr/Pb Selector IV03.
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Y pin 50, to QV36, to Main Video/Chroma Y Pr/Pb Switch IY03 pin 30 and 6.
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Pr pin 46, to QV38, to Main Video/Chroma Y Pr/Pb Switch IY03 pin 28.
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Pb pin 48, to QV37, to Main Video/Chroma Y Pr/Pb Switch IY03 pin 29.
SUB (PinP COMPONENT VIDEO PATH from IY03:
The following describes PinP Component outputs from the Video Chroma Y Pr/Pb Switch IY03.
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Y pin 24, to QY22, to PST2 connector pin 29, to U401 Flex Converter pin 17.
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Pr pin 22, to QY24, to PST2 connector pin 26, to U401 Flex Converter pin 19.
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Pb pin 23, to QY23, to PST2 connector pin 27, to U401 Flex Converter pin 18.
MAIN SIGNAL FROM FLEX CONVERTER U401:
The Flex Converter outputs only one horizontal frequency and that is 33.75Khz (540P) which relates specifi-
cally to 1080i deflection rate. So in other words, all inputs NTSC, 480i, 480P, 720P, 1080P are upconverted
to the higher deflection rate. 1080i is routed directly to the Rainforest IC I501 and has no need for Flex Con-
verter manipulation.
This can be a trouble shooting tool if the Flex Converter is suspected as having problems. Simply input a
true 1080i signal and the set automatically bypasses the Flex Converter.
The PinP is added inside the Flex Converter if selected.
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Y pin 16, to Q510, and into the Rainforest IC pin 68 of I501.
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Pr pin 20, to Q508, and into the Rainforest IC pin 66 of I501.
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Pb pin 18, to Q509, and into the Rainforest IC pin 67 of I501.
RAINFOREST IC I501 OUTPUTS:
This IC processes the input signal source, adjust brightness, contrast, color, tint, etc... and adds OSD information
and outputs the Main Picture as R, G and B.
•
Green is output pin 13 to Q541, 42, 43 and 44 to the PSC connector pin 7 then to the Green CRT.
•
Red is output pin 12 to Q537, 38, 39 and 40 to the PSC connector pin 5 then to the Red CRT.
Actually this signal first arrives at the Green CRT then it's routed to the Red CRT.
•
Blue is output pin 14 to Q545, 46, 47 and 48 to the PSC connector pin 9 then to the Blue CRT.
Actually this signal first arrives at the Green CRT then it's routed to the Blue CRT.
OSD:
(See Digital Convergence Interface Circuit Diagram Explanation for details).
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