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Pulled the service info today and the CRT heater is from a 6.3 volt winding on T1. P22 pins 11 and 13 go to the filament of the CRT. F1 is a 2 amp slow blow fuse to protect the CRT filament. So, the fuse, power transformer, and CRT are the main suspects. Also any connections such as P22 and J22 on the CRT board. P22 and F1 are located on the interconnect board. If the CRT doesn't light up nothing else matters. The transformer on the horiz. Module is likely for the oscillator or could be to couple the driver to the output transistor. I am not looking at actual module schematic only the block diagram and signal flow. Normally if that were bad you just replace the module.
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