This Main Board unit is designed for the VIZIO M3D550S television model. It is compatible with the Vizio brand and is a necessary component for optimal performance of the TV. This unit is specifically designed to replace any malfunctioning or non-functional main board in your television set. The unit type is a unit, and it is suitable for use with a wide range of TV, Video & Home Audio, TV, Video & Audio Parts, and TV Boards, Parts & Components. Please note that this item is used and has been previously owned, but it is in excellent working condition.