Vizio E500i-B1 Main Board (XECB02K0630) 756TXECB02K0630. >Main Unit, Main Board, HDMI Input, A/V Board, Signal Board, Tuner Board, USB Input, Digital Audio Output. =”color: #3366ff;”> =”color: #3366ff;”>. Partial part number (XECB02K0630) can be found on a barcode sticker located on the front of the board. Check out my other items.