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It could be as simple as a bad solder joint or as serious as a bad picture tube.
You could check the solder connections on the board that plugs onto the back of the tube (someone correct me if this model doesn't use one?)
If your handy with a soldering iron you could just go ahead and touch up the connections on the board (set off and unplugged) , pay particular attention to the circular row of pins that go to the tube.
If the board looks OK you can try (with the set on) tapping very gently on the neck of the picture tube with a plastic screwdriver handle. Use a mirror and look for streaking or flashing on the screen while you do this. If this happens you probably have a heater to cathode short in the tube.
For a set that new you can probably still get a rebuilt CRT from Video Display Corp or Hawkeye.
Eric
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