'74 Chromacolor II Overload

[BeamT]

Well,,,,I'm not much help. Disregard what I said above, it's what you get from trying to remember instead of looking at an actual schematic. Isolating the loads IMO is a good strategy. I found a partial schematic of the power supply. I see 4 DC supplies to account for. I can't see much about the loads.

I'm not sure the module interlock is present in the 19EC45?

The yoke plug and the vert circuit fuse I believe you have accounted for.

On the load side-

Where does the Horiz Output/Transformer get its supply? With the screws removed from the Horiz Output Transistor, what is the DC resistance to ground in the collector circuit? Probe behind the heatsink or through the screw hole. Could the Safety Capacitor/s be shorted to ground? Especially if they are the original white capacitors mounted on the Horiz Output Transformer. Damper diode could be shorted. Tripler could be bad. I believe you already checked the Horiz Output Transistor? All high failure parts.

I see the glass fuse that protects the filament xfmer secondary. Its located on the bottom center of the chassis behind the vertical upright portion, near where all the DC supply diodes are located. Is that fuse open?

Sorry for the distraction...