Working Principle Analysis Of The Unit - Sanyo LCD-22XR7SN Service Manual

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Working principle analysis of the unit

king pr ncip p le a a ysis of the unit
The RF signal received by antenna will be sent to tuner TUNER101, then IF signal will be
obtained through high amplifier and mixed frequency, through pre-intermediate amplified by V101,
then it will be sent to acoustic surface-wave Z102 to do IF filter and get better IF characteristics,
then it will be sent to N101 (R2S10401) to do intermediate amplification, phase-locked loop VCO
and synchronous wave detection to get composite video signal TV-VIDEO; after pre-intermediate
amplification IF will also be sent to acoustic surface-wave Z101 to do filter at the same time, then it
will be sent to N101 to do intermediate amplification and output the second sound intermediate
frequency signal (TV-SIF).
The TV-VIDEO signal output from R2S10401 together with TV-SIF will be sent to main IC NS2
(MST9U19A). Video signals of AV1, AV2, S-VIDEO and YPbPr will be sent to MST9U19A, and
their audio signals will also be sent to MST9U19A (AV1 and YPbPr share one group of audio ports,
AV2 and S-VIDEO share one group of audio ports). The video and audio signals of VGA and HDMI
will be sent to MST9U19A, too.
The main IC NS2(MST9U19A) is a high performance and fully integrated IC, which can realize
HDMI processing, video demodulating, video switch selection, A/D and D/A conversion,
interlace/de-interlace processing, modes conversion, OSD and low-voltage differential output, ect.
And it also has functions of audio selection, processing and MCU.
The video signal via MST9U19A processing, output 4 pairs differential signal and 1 pair clock
signal for PDP panel display. AV1, AV2, S-VIDEO and video signal of TV via selecting and
processing, then output AV-OUT signal to double amplifying, then it will be sent to AV-OUT.
A dio sign n al v v ia ia MST T 9U U 19A Audio signal via MST9U19A processing, one way will be sent to sound amplifier NV4
(R2S15102) amplifying to speaker. The other way via NV3(LM358) amplifying, then sent to AV-OUT.
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