Working Principle Analysis Of The Unit - Sanyo LCD-32XR56DZ Service Manual

Working principle analysis of the unit

1、 PAL/SECAM signal flow
PAL/SECAM signal from antenna is inputted into TUNER FQD1116 which is
an analog-digital-integrative model, the analog RF signal is demodulated by the
TUNER, then CVBS signal and SIF(sound intermediate frequency) signal are
outputted. TUNER FQD1116 is controlled by main chip MSD209（with embedded
CPU) through I2C bus.
TV CVBS signal is inputted into main chip MSD209 directly to be processed
by modules "VIDEO DECODER、DEINTERLACE and SCALER", then LVDS
signal is outputted to drive LCD panel.
SIF audio signal is inputted into main chip MSD209 directly and processed
by modules of demodulation, pre-amplification, acoustic effect processing and
volume control, then the audio signal are inputted into left and right sound tracks
of earphone amplifier BH3547F to be amplified and then are divided to two
signals, one is outputted to earphone jack, the other is inputted into class D audio
power amplifier R2A15112 to be amplified and then be outputted to speakers.
2、 DVB-T signal flow
DVB-T signal from antenna is inputted into TUNER FQD1116 to be tuned,
RF amplified, IF amplified and SAW FILTER inside, then IF signal is outputted to
demodulating chip CE6353 to be demodulated and then be inputted into main
chip MSD209 with format of standard serial or parallel TS stream for demultiplexing
and decoding.
Video route: demultiplexed video signal is decoded by main chip MSD209
and then digital video signal is outputted; in the end LVDS signal is outputted to
drive LCD panel after a series of digital processes and OSD addition within main
chip MSD209.
Audio route: demultiplexed audio signal is decoded into Dolby AC-3
signal or MPEG multi-sound-track digital audio signal by inner decoder of main
chip MSD209, then one is outputted through SPDIF directly; after the process of
"sub-transform and DAC", the other is outputted as analog audio signal, the analog
audio signal is inputted into the rear part of main chip MSD209 for acoustic effect
processing and volume control, then inputted into left and right sound tracks of
earphone amplifier BH3547F respectively to be amplified, now the audio signal is
divided into two, one is outputted to earphone jack directly, the other is inputted into
class D audio power amplifier R2A15112 to be amplified and then outputted to speakers.
3、 AV signal flow
After processed by impedance matching, AV video signal is inputted into
main chip MSD209 directly and processed by modules of "VIDEO DECODER、
DEINTERLACE and SCALER", then LVDS signal is outputted to drive LCD
panel.
AV audio signal is processed by circuits of "voltage divided, impedance
matching and AC coupling", then inputted into main chip MSD209 directlyfor acoustic
effect processing and volume control, then inputted into left and right sound tracks of
earphone amplifier BH3547F respectively to be