you've answered your own question.If you're not using the Mac, the high voltages doesn't matter, which is likely the result of the CRT not drawing any power.
And no the analogue board is not ruled out. You need to start being very specific at this point if we are going to be able to help you. Did you just visually inspect the joints and suspect caps for any physical damage? Or did you test all those caps with a multimeter, and re-flow the solder at all specified joints? Did you remove the cardboard or vinyl panel to look for any signs of burning? Have you tested the other suspect components with a multimeter (some out of circuit)?
Assuming you did all that, let's say for the sake of argument that your analogue board checks out OK. Do you know what your next step would be? If the problem is on the logic board, the only known cause for your symptoms I know of is to replace an IC on it, and given your symptoms, an IC would also have to be replaced on the analogue board no matter what. So you still have a repair to make on both regardless of whether the rest of the circuitry is good.
I believe you have everything you need to thoroughly test your Mac. Again I would pick up the Pina book too. Personally you could not pay me enough to go through the whole analogue board with a multimeter looking for one or two failed parts. If it were mine, I would simply start replacing all the known trouble components on the board (which have reached the end of their lifespan anyway) using this excellent guide by JDW.