Vizio L37, Service Manual

Page: 37 / 133

CONFIDENTIAL – DO NOT COPY Page 8- 1
File No. SG-0176
Chapter 8 Theory of Circuit Operation
The operation of D-SUB 15pin route
The D-SUB 15pin is input analog signal to the MTK8205 transfer A/D converter then
generates the vertical and horizontal timing signals for display device.
Th e operation of HDMII CON route
The HDMI CON is input digital signal the signal is process to the sil9011. Then transfer to the
MTK8205, the MTK8205 generates the vertical and horizontal timing signals for display
device.
The operation of HDTV & Component route
HDTV & Component signal is input to switch IDTQS3VH257 (Select Component1 or 2). Then
transfer to the MTK8205 the MTK8205 generates the vertical and horizontal timing signals for
display device.
The operation of Video 1,2,3 & S-Video route
The Video 1,2,3 and S-Video signal is transmission signal to main board MM1492 (Switch)
and output to MTK8205 the MTK8205 generates the vertical and horizontal timing signals for
display device.
The operation of TV route
TV signal is processes to the tuner and output to MM1492 (switch) then transfer to MTK8205
the MTK8205 generates the vertical and horizontal timing signals for display device. Audio is
processes to the tuner output to SIF circuit and output to MTK8205.Then MTK8205 process
to wm8776 and output to TDA8946J transfer to speaker
The operation of DTV route
DTV signal is processes to the tuner and output to MT5111 who handle ATSC input to match MPEG-2 package,
then transfer to MT5351. After passing through decoder, the signal will be with the digital signal tri-dtate from
HDMI transfer to digital port of MT8205
The operation of keypad
There are 8 keys to control and select the function of L32 and also has one LED to indicate
the status of operation. They are “Power, Mute/Exit, OSD,
▼▲ , + -, Input”.