(Main Board or AV Board) is an electronic component that connects and synchronizes all technical elements / modules in modern TVs. The main task of every main board is to provide communication between the central processing unit(CPU) and all other components in the system (TV).The main board parameters define some of the main features of modern televisions, they are also the main electronics carrier such as: A CPU that integrates itself (video processor, sound processor, multimedia processor, etc.), memory tuner, sound amplifier. From the main board depends on what kind of input/output ports will have your TV. (HDMI, WI-FI, bluetooth, USB, headphone output, composite output, scart, optical output, and more.