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Chapter 3 - Analysis of the Signal process Flowchart
The chapter mainly introduces the receive and dispose of the video and audio
signal , the power supply system and system control process of this TV.
1. Video Signal Flow:
Analog RF signal enter into the tuner for decoding and output the CVBS signal, and
then this signal is sent to the MSD116L through low pass filter for processing, format
transformation and producing LVDS signal displayed on the screen. Digital RF signal
enter into the tuner for decoding and output the digital IF signal, and then this signal is
sent to MSD809 for decoding and output the transport stream which is sent to MSD116L
for processing in order to form uniform up-screen signal format.
Signals input from VGA、AV、SVIDEO and YPbPr would directly enter into MSD116
for processing to form uniform up-screen signal.
HDMI signal was sent to MST3383 for processing first and then transmitted to
MSD116 for processing to form uniform up-screen signal.
2. Sound process Flow:
ATV：RF signal which is demodulated by tuner convert SIF signal ,then it would be
sent to MSD116L for sound disposal, the output audio signal is zoomed in by TL062 and
TDA1517, and is sent into the speaker at last.
DTV: RF signal which is demodulated by tuner convert digital IF signal, then it would
be sent to MSD809 for decoding, and then the signal is sent to MSD116L for sound
disposal, the output audio signal is zoomed in by TL062 and TDA1517, and is sent into the
speaker at last.
AV、PC、YPbPr: Audio signal is directly sent into MSD116L for sound disposal, the
output audio signal is zoomed in by TL062 and TDA1517, and is sent into the speaker at
last.
SPDIF: Audio signal which decode by MST3383(HDMI) is sent to MSD116L for sound
disposal, then the output audio signal is sent into the Digital Power Amplifier.
3. The TV power supply system：
2 channels voltage are transported from the power supply board, they are +12V and +5V, they
will not be cut off in standby mode. +12V is provided for PA (TDA1517), and it is transformed
into +6V to provide for U32 and U33,+12V is also transformed by U5(MP1411) into +5V which is
provided for the panel, +12V is still transformed by U4 (MP1411) into +1.8V to provide for
MSD116L; +5V is provided for infrared receiver and EEPROM, +5V is transformed by
D0(AZ1117) into 3.3V、2.5V and 1.2V which are provided for IC, and they will be shut off under
standby mode. +12V and +5V is controlled by U3 (7413), +12V and +5V of the 7413 will be cut
off under standby mode, and it will output +12V and +5V when power on.
3.1 The composition and distribution of the TV power supply：
and Key Point Measure Data
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