++@mikeghc here is the manual for it. [document|4793]. with that you can disassemble your Keyboard. The connector in question is JK101 and the Yamaha part number for that is++ V8149800
You can try and source the connector either from a broken board (it appears that most Yamaha Keyboards use the same connector) or you can measure the physical attributes and see if you can find a match at either mouser.com or digikey.com as well as any other place. Your keyboard is definitely repairable Let us know what you find.