Korg EC-320 no longer produces sound through speakers. The Head phone connection produces sound. Piano quit after child pounded on lower keyboards...the lights blinked....then went solid....followed by no sound.

Is this failure similar to a preamp circuit board? The Korg preamp is KIP2403, which no longer available. Any ideas other than buying an external amp & speaker system like a TV sound bar?

Joe D,, December 2012