Sanyo LED-42XR10FH, Service Manual

Page: 17 / 48

Working principle analysis of the unit
Signal Flow
1
、
PAL/SECAM signal flow
Send PAL/SECAM analog RF signal received from antenna to TUNER
FT21XX
which is controlled
by main chip
MSD209GL
through
I
2
C
BUS; CVBS video signal and SIF audio differential signal will be
outputted after demodulation;
CVBS video signal is sent into main chip
MSD209GL
to be processed by modules of video decoding,
deinterlacing, video processing and zoom, then LVDS signal will be outputted to drive display panel;
SIF audio differential signal is sent into main chip
MSD209GL
to be demodulated to analog audio
signal, then it is sent to earphone amplifier
BH3547F
to be amplified after the processes of
preamplification, acoustic effect processing and volume control, and then it is divided into two, one is sent
to earphone jack, the other is sent to audio power amplifier
R2A15112FP
(D class) to be amplified and
then drive speakers.
2
、
DVB-T signal flow
Send DVB-T digital RF signal received from antenna to TUNER
FT21XX
which is controlled by main
chip
MSD209GL
through
I
2
C
BUS; after down frequency conversion, differential IF signal will be inputted
into demodulator IC
MSB1210
to be demodulated; then it will be sent to main chip
MSD209GL
with the
standard format of serial or parallel TS stream for demultiplexing and decoding;