If you have a unit that has no power to console here are some things to check for.
1)Check to see if you have 12vac coming from the two blues wires from the 5 pin connector that comes from the transformer and plugs into the lower board.
*If Yes, we know transformer is good
*If No, you will need to replace the transformer
2)Check to see if you have 12vac from the orange & gray wire from the 7 pin harness that plugs into the lower board.
*If Yes, the lower board is good.
*If No, the lower board is bad.
3)Check the orange and gray wire where it plugs into back of console.
*If Yes, you have voltage and the console is bad.
*If No, the wire harness is bad.