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 repaired Electribe SX silcione pads once for a friend at around 50EUR. Its a bit of time, maybe an hour to open it up properly with ESD and check stuff.
I´d say 60EUR is ok even if there is no outcome. Sometimes its just dry capacitors or a soldering bridge etc than it might be a bit more with ordering stuff shipping and soldering etc.
I have no idea what they charge at Korg etc, doubt there are much repairshop as cost is perceived as pretty high and thus not a sustainable business in that niche?