Kurzweil PC2/X Freezes during load, bad "motherboard?"

Hello everyone. So I have this Kurzweil PC2/X that just started to show blocks on the LCD and doesn’t get further than that. I have looked for a replacement main board and can’t seem to find it anywhere as the synth has been discontinued. I would like to try to repair this and have experience soldering all sorts of electronics. Any help would be appreciated. See pic attached https://imgur.com/gallery/liXG9Pj