I'm looking for troubleshooting suggestions for a Aquarite Goldline generator system. I have no display or lights and know the following:

- I replaced the main circuit board because the Hayward folks told me this was the most likely fix if the fuse was good. So I have a new board with fuse installed.
- This system has no external fuse, so uses the fuse on the board.
- I have power to the main circuit board.

Any thoughts on what to do to try and isolate the issue. I don't perceive there to be but 2 other components: 1) the small circuit board with the display on it and 2) the transformer. But I don't know how to determine if one or the other of these is at fault. Or, if there are any other possibilities.

One final note. This system is "out in the country", so I have limited access to it - 1/2-day round-trip travel time.