The repair kit contains replacement for the memory IC that contains the Vizio XVT473SV firmware.
Vizio XVT553SV main board 3655-0122-0150 / 3655-0122-0395 - serviced, tested, $50 credit for old dud
A functional Vizio XVT553SV LED TV main board that can fix totally dead or failing to start TV. You can then return the old dud and receive refund to lower your total cost.
The repair kit contains replacement for the memory IC that contains the Vizio XVT553SV firmware.