On offer is Vizio mainboard 756TXFCB0QK0120. For Vizio tv model(s). This mainboard has been upgraded with 2 8mm silicon heatsinks which siphon heat. Away from critical components and extends the life of the board. This is a replacement board for tvs experiencing malfunctioning symptoms such as. Black and White Only. Stuck on logo screen. Nick’s Electronics Repair is a brick and mortar TV repair shop operating out of Tucson. We service, refurbish and resurrect electronic components such as these that. And we stand by our work!