Automatic Transmission Problem
 

Good day!
I have problem with Mazda 2 2004 automatic transmission. The car won't even start because it can't see any gears. I guess there's problem with electronical part of the transmission. Maybe any one had similar problem? Is it possible to change only the electronical part? I don't know much about cars, but we tried to fix it several times in the car service. However, every time electrician fix it for like 50 eur, it brokes down again. Is there any solution instead of changing the whole thing?