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Working principle analysis of the unit
RF signal from antenna is sent into TUNER301 to be processed by
HF-amplified and frequency mixing, then IF signal is outputted to SWF Z301 to
be IF filtered to get ideal IF characteristics, then the signal is sent to main chip
N101(RTD2674S)-27#,28# to be amplified by inline IF amplifier and
synchronous demodulated to get CVBS.
Video and audio signal from AV and YPbPr are sent to main chip N101 directly;
video and audio signal from VGA and HDMI1, HDMI2 are also sent to main
chip N101 directly.
Main chip N101(RTD2674S) is a special large scale IC with full functions, such
as HDMI interface process, video decoding, video switch selection, A/D and
D/A transformation, interleaved/successive scans, mode transformation, OSD
and low-voltage difference output process, etc.; furthermore, it also has
functions of audio selection and process, MCU, etc.; external video signal is
processed by main chip N101(RTD2674S), then 4 pairs of difference signals
and one pair of clock signals are outputted to LCD to display; external audio
signal processed by main chip N101(RTD2674S) is sent to sound amplifier
N308 (R2A15112FP) to be amplified and then to speakers.
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