There is a quirk with these machines where one of the smaller components , if it fails , can cause the symptons you describe. Try disconnecting each component individually and see if the board magically lights up. The 3D sensor at the rear is a favourite but it can also be the valve , pressure switch etc
The 3D sensor helps prevent uneven loads from spinning by monitoring the movement of a magnet attached to the top rear of the tub. Its on the opposite side to the valves at the rear.