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there is two possibilites that can cause this problem, one is that the crt (picture tube0 may be getting weak and taking a long time to get brite enough to see, it is very expensive to replace that.
the second one is that the high voltage ( 30,000) that feeds the anode of the crt may be week or very slow reaching the point needed to have the display brightness necessary to show a picture. a high voltage probe meter is required to measure this voltage.
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