Vizio M492I-B2 Main Board (791.00710.0004, 755007010001) 75.50070.100. 110px; width: 801px;” border=”1″ cellspacing=”0″ cellpadding=”0>. >Main Unit, Main Board, HDMI Input, A/V Board, Signal Board, Tuner Board, USB Input, Digital Audio Output. 13084-1>, 748.00713.001>, 755007010001. Part number can be found in a little white box located on the front of the board. Please make sure your box has 755007010001. Check out my other items.