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4 piano keys not working (seems electronic problem)

Since a few days ago, four piano keys on my 2'5-year-old Korg B2 piano have been not working at all.

I disassembled the piano, cleaned it, and tried to replace the rubber/carbon pads of the problematic keys with other ones from another octave, but nothing changed. It seems somehow to be a problem in the circuits.

The non-working four keys are located adjacent to each other and look like they are in the same group:

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I would like to highlight that I'm completely ignorant in this area of knowledge. I did check other posts with similar problems, but I don't know where to start checking in this labyrinth of circuits.

Any ideas, guys? I would much appreciate some expert eye in here and proper guidance on what to do next.

Thanks in advance! :)

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Hi, how did you manage to open the piano?

I really cannot find the way to disassemble it. I removed all the screws from the back and still don’t know how to access the part you showed here.

Can you give some indication please??

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Hi @pcastle48662

I cannot find a schematic for the keyboard but with most it requires 2 wires for specific notes to play so if one wire was faulty it may affect several notes connected via diodes, to those two wires, for example C, E and G#.

Usually all the octaves of those particular notes may be affected or only the octaves up to or past where the problem was, so it is unusual for 4 notes, I assume all are in the same octave, to be the only ones affected.

Looking at the images you provided the only common thing that I can see that might affect the group of 4 keys you selected, is on the lead with the resistor in it as shown in the image below.

Please provide some more images showing the keys' wiring multiple to the left of the image you posted to see if all the groups of 4 keys to the left (and right?) of those highlighted also have a similar component for them as well.

If they do you may have to trace back the lead with the component I highlighted to the left of the board to check where it connects to. I think that I've shown the correct lead heading to the left on the board multiple but double check to make sure

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