Vizio L42HDTV10A Service Manual page 97

The purpose is process the input audio signal to control volume, bass, treble,
surround, and balance. The HDMI video and audio is must transmitting to MT8293
processed then TMDS signal to the MTK8202 generates the vertical and horizontal
timing signals for display device. All functions are controllable by the main board.
Plus, all functions in the IC boards are programmable using I2C Bus.
CONFIDENTIAL – DO NOT COPY Page 10-2
File No. SG-0198