I am not an appliance technician. I don't know. There is not need to measure the voltage as your washer does not flashing 4 times.
According the service manual, the green LED flashes 1 second on and 1 second off when idle. Your inverter board does not flash anything. The failure at the motor assembly in such a way that it does not flash. Since I am not an appliance technician, may be a technician will confirm my reasoning.