Since it's going through its usual boot process correctly, a great deal is working. Since the hard drive needs both +5 and +12, all the supplies are basically ok.

In the absence of other data, loss of raster subsequent to loss of vertical deflection still screams "connector trouble" to me. Yes, it is possible for multiple failures to produce the effect you're seeing, but the probability is low enough that I'd still spend a fair amount of time investigating carefully the "usual suspects" first. Verify that the +30V video power line is within, say, 5-10% of nominal. If it's only +12 or zero, that would explain loss of raster.

With power disconnected, carefully verify continuity between the yoke connections at the crt end of things and their points of origin (i.e., flyback terminals in the case of the horizontal drive, and the TDA1170+ associated components in the case of vertical drive). That test will exercise all interfaces along the way, just to make sure you haven't missed something.

Disconnect and reconnect all cables on the analog board. Inspect all mating surfaces for any telltale signs of corrosion, burning, etc.

Perform a careful visual inspection of both sides of the analog board.