Ensoniq eps - won't power up. Screen flashes for a second on power up then goes out

My EPS finally bit the dust. I’ve owned it since 1987. Upon powering up the screen flashes on for less than a second then turns off. Inserting a boot disk does nothing. The external fuse is good. All internal fuses that I can see are good. Does anyone know where to go from here? I have an electronics background and can trouibleshoot, use a multimeter and solder to milspecs. Does anyone have a schematic so I could check voltages? This keyboard is like an old friend and I don’t want to say goodbye yet.