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Here is one of my favorite diagonstic tricks that newbys can try. I doesn't take any special exotic equipment. The fluorescent bulb doesn't have to be good, the glass tube has to be still sealed though.
If the bulb lights when held near the horizontal output, flyback or yoke leads then the horizontal output circuit is working. Before compact fluorescent bulbs were available neon bulbs were used. I guess now the compact fluorescent bulbs are being phased out.
The horizontal circuit has to be working before the CRT High Voltage (HV) will be produced.
The filament voltage for the HV rectifier tube comes from the flyback transformer. The filament usually can't be seen anyway on that tube.
Do get a schematic and learn how to read it.
Do be very careful around the B+ and Boost voltage. Stay at least a couple of inches away from the tube caps, the voltages there can jump when the set is working.
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