Vizio GV42L HDTV, L42HDTV10A service manual Theory of Circuit Operation

Chapter 7 Theory of Circuit Operation

The operation of D-SUB 15pin route

The D-SUB 15pin is input analog signal to the MTK8202 transfer A/D converter then generates the vertical and horizontal timing signals for display device.

The operation of HDMII CON route

The HDMI 1&2 CON is input digital signal to the PI3HDMI412FT switch output signal is process to the MT8293. Then transfer to the MTK8202, the MTK8202 generates the vertical and horizontal timing signals for display device.

The operation of HDTV & Component route

HDTV & Component signal is input to the MTK8202 then MTK8202 generates the vertical and horizontal timing signals for display device.

The operation of Video 1,2,3 & S-Video route

The Video 1,2 and S-Video signal is transmission signal to the MTK8202 then MTK8202 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 MTK8202 then MTK8202 generates the vertical and horizontal timing signals for display device. Audio is processes to the tuner output to SIF circuit and output to MTK8202.Then MTK8202 process to wm8776 and output to TDA8946J transfer to speaker

The operation of DTV route

DTV signal is processes to the tuner and transmission to MT5112 and output signal to MT5351 then MT5351 output to MT8202 generates the vertical and horizontal timing signals for display device.

The operation of keypad

There are 7 keys to control and select the function of L42 and also has one LED to indicate the status of operation. They are “Power, ▼▲, + -, Input, OSD”.

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