Mitsubishi Electric LT-2220 Service Manual page 25

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050
(I) IC500 : Interlace-to-Progressive conversion IC ( gm6015 : Genesis)
This IC performs the following functions to all input signals except the PC input.
Motion adaptive De-interlacer for SD (480i) signals.
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Scaling
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PIP / POP control for AV input combinations.
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Color / tint control
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3 dimension Noise reduction.
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Adaptive Film mode
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Sync Separation for Composite sync.(for component only)
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A format change to the input signal is also made by this IC.
Control is performed in 5-line serial communication from the MCU.
1-1-3. VIDEO and TV input circuitry
For VIDEO and TV inputs, the signal is applied to IC400, signal processing IC, via the following ICs.
(J)IC701 : Analog-switch IC (CXA2089 : SONY)
In this IC, the composite signal (CVBS) from video1/2 input or composite signal (S-video) from
video1/2 input is chosen by register control of IC 701 via 5V IIC-bus.
(K)IC702 : Buffer IC with LPF ( MM1566AF : Mitsumi)
IC701 reduces the high frequency noise ingredient of the video signal.
(L)IC100 : Analog-switch IC (CXA2069 : SONY)
In this IC, the composite signal (CVBS / S-video) from the video1/2 inputs or the composite signal
(CVBS) from the TV input is selected by register control of IC 100 via 5V IIC-bus.
It is also selected and sent to IC300 for CCD use.
(M)IC601 : Digital decoder IC with 3D Y/C separation (uPC64011 : NEC)
This IC converts the analog video signal (S-VIDEO/CVBS) from IC100 into a digital signal.
Besides digital conversion this IC also has the following functions.
3 dimension Y/C separation for CVBS
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Contrast adjustment.
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Brightness adjustment.
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FIELD signal generation.
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PLL (Phase-Locked Loop) : referential clock generation.
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Sync signal generation
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This IC is controlled by register control of IC 601 via 3.3V IIC-bus.
This IC's output is sent to IC400.
(The output format is YPbPr and WXGA. Thw Vertical frequency is 60Hz.)