Hello everyone I recently purchased a 1990 Williams Whirlwind (System 11b). **Please excuse my vocabulary as I am still learning as to what each element and board is called** When first purchased it would not turn on at all as if not receiving any power. I diagnosed that the power board was the issue and replaced it with a new one from "Rottendog Amusements". The machine would then power up and go through the start-up process, but the character display glass was not displaying any information. From there I found that someone had incorrectly connected the 26-pin ribbon cable that goes from the CPU board to Master display board (labeled J3 on the schematics). Once I got that connected correctly everything operated as it should.

I recently went to set a new high score, but when I turned on the machine only the field lights turned on with no start-up run through. It acts like it isn't on or running but there are light on. I checked the new power board but it is doing its job and all of the voltage is coming back good. The only issue I found is from the power board to the CPU board. There is a 9 pin (HDR) connector (item 120, part number 5791-10862-09, labeled 1J7) that is only receiving +3V when it should be at 4.8-5.2V. I read that this could be cause just the field lights to turn on, but not be enough power to get the CPU to fire up... I am at a loss as to how to fix this and where I should go next.

Thanks for the reply. I found that my power board has the is putting out +/- 100V and the +/- 12V but is not doing the 5V. What would be the culprit of the board not putting out that portion of power? Would it be something I could replace?

Do you have any contacts for board repair? Preferably in the U.S.?