Sharp LC-55LE643U_FPTW, Service Manual

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CONFIDENTIAL – DO NOT COPY
Page 7-1
File No. SG-0000242
Chapter 7 Theory of Circuit Operation
The route of HDMI CON input
The passing signal is processed with the MSD8220. Then MSD8220 generates a LVDS for display
device.
The route of HDTV & Component input
HDTV & Component signal is inputted to the MSD8220.After processing, MSD8220generates a
LVDS for display device. The audio signal is inputted
MSD8220. After processing, MSD8220
transmits the signal to audio output. an audio amplifier and line out.
The route of CVBS input
The CVBS signal is inputted to the MSD8220.After processing, MSD8220 generates a LVDS for
display device. The audio signal is also inputted MSD8220. After processing, MSD8220 transmits
the signal to audio amplifier. Then, the amplified signal is the output audio signal.
The route of TV input
TV signal is demodulated by the tuner then the demodulating signal is divided into two parts, video
and audio signal. The video signal is processed by MSD8220 then MSD8220 generates a LVDS
for display device. The audio signal is transmitted in the route named SIF. The SIF signal is
demodulated and decoded by MSD8220. The audio signal is inputted MSD8220. MSD8220
transmits the signal to audio amplifier. Then, the amplified signal is the output audio signal.
The route of DTV input
DTV signal demodulated by the tuner then the demodulating signal is divided into two parts, video
and audio signal. The video signal is demodulated by MSD8220. The demodulated signal is
transmitted to and processed by MSD8220. Also, MSD8220 generates a LVDS for display device.
The audio signal is transmitted in the route named FAT-IN. The FAT-IN signal is demodulated and
decoded by MSD8220 After processing, MSD8220 transmits the signal to audio amplifier. Then,
the amplified signal is the output audio signal.
The operation of keypad
There is keypad to control and to select the function of LC-55LE643U. Also, there is a LED to
indicate the status of operation. (White
 ON)