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My laptop has a dim screen - can this be fixed?

A dim screen can be caused by four things:
  1. The LCD inverter which causes the LCD panel to light up
  2. The CCFL fluro tube in the LCD panel
  3. The motherboard supplying signal & voltage to the inverter
  4. A damaged video cable between the laptop and the screen 
Most commonly (say 80% of the time) it’s the inverter, 10% it’s the ccfl tube in the LCD panel, and 10% it’s the motherboard or the VGA cable.