where (vaugely) do you live? where do you take your equipment for repair? how much did you pay? … and what did you have done? just curioous… thanks!
many years ago, i took a MC303 to the local shop that works on synths… I said “it wont turn on and the power suppy is OK and the power connection to the board is OK, can you help me?” they said… “sure, we can take a look at it” when i went back, they brought it out and said “it wont turn on but the power suppy is OK and the power connection to the board is OK too, so we cannot help you, you will have to send it back to Roland???” this expert opinion cost me $60 20 years ago.
I live in Zurich (Switzerland), there‘s a great synth repair shop here. I once had him fix a Roland JV 1000. The keys were badly glued together and many weren‘t working (epoxy resin issue) and I wanted to use it for piano practice and as my master keyboard. Cost me about 400$ (which is more than I payed for the synth) but I don‘t regret it, still works great :)