Sanyo LED-46XR123D, Service Manual

Page: 15 / 37

Working Principle of the Unit
1
、
ATV PAL signal flow
Receive RF PAL analog signal and sent it to
XC5200C
(D/A silicon Tuner controlled by main chip
MSD309PX
through I
2
C bus) to be demodulated, then differential IF signal is send out to main chip
MSD309PX
analog demodulation to be demodulated to get analog CVBS video signal and SIF sound
signal.
CVBS video signal is processed by back-end video decoder, anti-interlacing part, video processor
and zoom controller, then a pair of LVDS signals are outputted to chip
MST6M30
to be processed by
modules of 120HZ, MEMC and 3D effect, then two pairs of LVDS signals are outputted to drive display
panel.
SIF sound signal is processed by back-end demodulator to get analog sound signal, then processed
by pre-amplifier, acoustic effect processor and volume controller to get two parts of signals: the analog
part of signal is sent to earphone amplifier
MAX9820
to be amplified and then outputted to earphone jack;
the digital part of signal I2S is sent to digital audio power amplifier
TAS5711
to be processed by D/A
converter and power amplifier, then outputted to drive speakers.
2
、
DVB-T signal flow
Receive RF DVB-T digital signal and sent it to
XC5200C
(D/A silicon Tuner controlled by main chip
MSD309PX
through I
2
C bus) to be processed by down-frequency-conversion, then differential IF signal is
send out to main chip
MSD309PX
digital demodulation to be demodulated, then standard parallel
transmission flow is outputted to back-end demultiplexer and decoder to be processed.
Video channel: demultiplexing digital video signal is processed by
MSD309PX
decoder and video
processor, then a pair of LVDS signals are outputted to chip
MST6M30
to be processed by modules of
120HZ, MEMC and 3D effect, then two pairs of LVDS signals are outputted to drive display panel.
Audio channel: demultiplexing digital audio signal is processed by
MSD309PX
decoder and audio
processor, then double-sound-track analog audio signal (stereo) is outputted to
MSD309PX
to be
processed by preamplifier, acoustic effect processor and volume controller to get two parts of signals: the
analog part of signal is sent to earphone amplifier
MAX9820
to be amplified and then outputted to
earphone jack; the digital part of signal I2S is sent to digital audio power amplifier
TAS5711
to be
processed by D/A converter and power amplifier, then outputted to drive speakers.
3
、
AV input signal flow
AV video signal is inputted to main chip
MSD309PX
to be processed by video decoder,
anti-interlacing part, video processor and zoom controller, then a pair of LVDS signals are outputted to
chip
MST6M30
to be processed by modules of 120HZ, MEMC and 3D effect, then two pairs of LVDS
signals are outputted to drive display panel.
AV audio signal is processed by voltage divider, resistance matcher and AC coupler, then sent to
main chip
MSD309PX
to be processed by acoustic effect processor and volume controller to get two parts
of signals: the analog part of signal is sent to earphone power amplifier
MAX9820
to be amplified and
then outputted to earphone jack; the digital part of signal I2S is sent to digital audio power amplifier
TAS5711
to be processed by D/A converter and power amplifier, then outputted to drive speakers.