Vizio VX42L HDTV10A Service Manual page 94

The RF signals include analog and digital TV signals. Two kinds of signals are
processed by two kinds of ways. We introduce the processing way of analog
signals, then digitals is similar they. First of all, analog signals are processed by
MT5372. The processed signals are divided into two parts, video and audio. Video
signals are converted as LVDS and transmitted to the panel terminal. MT8291
processes the processing audio signals, and transmits these signals to audio
amplifier. Digital signals are processed by MT5112, a demodulator, firstly. After
demodulating, they are processed as the same way as analog signals.
The two ports of HDMI signals pass a HDMI signal switch (PI3HDMI412FT-A).
MT5372 processes HDMI signals directly, then transform video signal to LVDS and
audio signal to I2S. LVDS are transmitted to LCD device, and I2S signals to U28
(MT8291). The passing signals are processed as other audio signals.
Main broad block diagram shows the routes of these signals in our system.
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