I had a similar problem.
I used this guide to troubleshoot:
Scroll down to section "3n When things don't work - High Voltage section problems".
The photo shows the high voltage section of the solenoid driver board. Under that plastic line shield is a tiny 8AG fuse. This fuse protects the high-voltage side of all displays. I'm suggesting this as another place to check while you're looking.
Just as a reminder, you need to remove at least one end of the fuse from the fuse-holder to properly check for continuity on fuses (just in case you weren't already).
The above article has a really good walk-through for checking the power supply, rectifier board, and other items. Your troubleshooting method appears to be sound. Start at the source - where voltages are derived. Chase through the system until the fault becomes evident.