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There are many things that can cause a dark screen/no picture condition. The first thing I'd do is check for the presence of HV at the anode connector of the CRT. Be careful because there are many thousands of volts here and the CRT can hold a charge. A quick and dirty method to determine if HV is present is to draw an arc with a screwdriver. For a more accurate test, you meed a high voltage probe that will tell you exactly how much HV is getting to the CRT.
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