Hi, are your LFO lights OK, or are they malfunctioning too? If so, it could be a capacitor issue rather than an LCD one.
http://www.infekted.org/virus/showthread.php?p=305917
If it's your LCD, I'm unsure of where to get a replacement. However you could try these guys, who are the repair branch for Access Virus:
http://www.synthesizerservice.de
They may be able to sell you an LCD.