Kawai R-100 Not working properly

[Landure]

Hi, I'm new to this forum and have little experience when it comes to tinkering within hardware. My problems is having dropped my R-100 it is not surprisingly not functioning anywhere near correctly. When I power it up the lcd screen is illuminated but no information is displayed, various function led's light up but when the unit is switched off and back on again often the same led pattern is not the same.
No sound is emitted from any pads. I have taken the unit apart and have stripped every board out except the power supply board and the lcd screen. All boards seem to be perfect with no obvious signs of damage including the main cpu board, any help or guidance would be gratefully received.