Dell Inspirion 1521 laptop monitor will not stay on

My dell inspirion 1521 laptop screen will not stay on. What could be the problem? I can hook an external monitor up and it works fine the laptop monitor will not stay on longer that a few seconds
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More about dell inspirion 1521 laptop monitor stay
  1. sounds to me like either a bad inverter board or a bad backlight. Either way something will have to be replaced.
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