New controller - problems

I am having some problems with the new controller board and/or the repair work performed on the keyboard. For some reason the electronics draw a lot more current than they are supposed to. The voltage regulator quickly heats up. I removed all the ICs for the rotary encoders, as one of the chips got very warm, but the problem is still there. A bit of a bummer really, as I'd hoped to focus on the box design and programming now.