So the synth powers up, LED and lights etc, but no sound? Well if anything blew due to improper voltage it would not power up at all. Maybe a CPU issue or problem with main board.
Check EG settings and make sure the filter(s) are not closed all the way.
Maybe take it to an electronics repair shop and have them check the board. It would be fairly simple for them to diagnose.
They are great synths. Hopefully it can be reanimated.
DSI MEK, DSI Prophet '08, Yamaha DX-7, Roland Gaia, Roland Alpha Juno 1, Arturia MiniBrute, Korg Monotribe, Yamaha AN1x, Korg X-50
Ibanez Artcore A85 JazzBox, Ibanez SZR720BB, 1989 Gibson Les Paul Standard, 1981 Gibson ES-335, 1986 Fender JapStrat.
Roland RE-201 Space Echo, MXR Carbon Copy Delay, MXR Analog Stereo Chorus, Digitech RP-1000 MFX
Amps: Fender HR Deluxe 112, Peavey KB100
Zoom HD16 Hardware Recorder, Cubase 5, Yamaha HS50m Monitors