This VIZIO main board is compatible with model GV421 and is designed to enhance your TV viewing experience. It is a high-quality replacement part for your Vizio TV, ensuring optimal performance and functionality. Crafted to the highest standards, this main board is sure to meet your expectations. It is ideal for those who are looking to improve the performance of their Vizio TV without breaking the bank. Get your hands on this excellent Vizio main board and take your TV viewing experience to the next level.