hi Rajan,
Yes it's difficult to say without knowing exactly what'r wrong with the unit. Typically it would cost EUR 60 for investigating, repair and shipping it back. If the PCB is unrepairable for some reason then the costs would be higher. Please include your phone number and we will always ring you first before making costs.
It's our goal to have you up and running VisualDMX again asap. , at a minimum cost.