Servis M6003 washing machit!

I have this model servis in the workshop after fitting a module and having no joy. To start with it would only drain, all lights on and wont reset. All components check out o.k. so a board was ordered, New board fitted and all the lights now flicker and it wont do a thing even with the old board re-fitted. It’s now doing my head in! it’s only a servis for gods sake how hard can it be! Any ideas?

Nige