Akai S1000 / S1100 samplers

Hi,

I have a problem with my s1100 and am not totally sure of what I need to replace. Basically its 50/50 if the thing powers up it was spontaneously rebooting every now and then originally. As I am quite competent at soldering I took out all the power pcb’s and resoldered to see if that would help. I have also replaced the backlight recently. At first it powered up ok but after a few times it seems to be getting power but the LCD is showing nothing not lighting up also sometimes the LCD does a strange thing as if the lcd is slowly filling every part of the screen so I am at a bit of a loss at what to do next. Any advice appreciated cheers