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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, SCART 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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