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Might be a case of opening up the M50 as the previous poster did and wiggle connectors and components until the sound is affected. If you have some electronics experience, it should be fairly easy to figure out which board to investigate.
Hello, You may want to reset your machine, all data and pre loaded programs, for this you must turn on your M50 press the global mode button, click on the top arrow next to (basic) select option 2, load pre-preloaded demo data, you then choose all (PCG and demo songs). press OK. Your Korg will re install all factory samples, data and settings. Once completed It will then instruct you to turn off your machine. give it a minute or so to self upgrade before turning it back on, once you turn it back on you should see updating panel notifications right and left, you should be able to use all of the sounds and combi's available for M50. that's a factory reset. I hope this helps, Have a great day.
Hello I have this M50 61 key korg model, I had the same issue the fix is simple remove the back cover on the unit, carefully push in all the small cables reattach them well do it to all the small connectors these cables get lose and cause this issue, good luck let me know if that helped I fixed mines that way its been working excellent since. good luck..
The key contacts are probably dirty. One has to dis-assemble to get at the contacts. They are usually little black conductive rubber "pills" within silicone rubber domes, often in strips for several keys. Clean the pills AND the circuit board traces they contact with ONLY 99% isoprophyl alcohol and Q Tips. DO NOT use rubbing alcohol !!!
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