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If it has an ion trap magnet, have you tried adjusting that? It's on the neck of the picture tube and it can be rotated or slid forward and back.
You can't hurt the TV by experimenting. Note the initial position of the magnet (in case it's already in the right spot). Move it around until you find a "sweet spot" where the screen is brightest and you don't have any shadows on the edges.
There may be other causes of a dark screen, but that's an easy & obvious thing to check.
Phil Nelson
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