JBL CINEMA SB 450, DON'T GET TO "ON" POSITION

I am an electronic Eng., with much experience, but just need the service manual, of the unit, and also I wonder if anyone came across the same problem, and have any information, what could be the problem. I checked the main power supply, and the fuse all is fine but the power from the operation panel does not come ON.
I will be grateful if someone will come back to my email: 4x4dk35@gmail.com