B2 flat note keeps "ghostly" triggering itself
Hi, I have a Yamaha psr-e223 and after removing the rubber contacts and cleaning/undusted the card, the B2 flat note keeps "ghostly" triggering itself, I turn it off and on but after a while it triggers itself again, first randomly beating but then soon gets stuck pressed on,
disassemble everything again and double checked, but the note keeps triggering itself with not external/mechanical touch to the board. where is the problem? Can't find any help on line about this.
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