HOW CAN YOU TELL IF ITS YOUR INVERTOR OR BACKLIGHT OUT

my laptop went black the screen i read were it might be a lose connection so i poppedopen the screen unplugged the invertor and it worked fine for a while then when one day iwent to turn it and black screen how can i tell if its the invertor or backlight?
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More about invertor backlight
  1. If you have a meter that can test rf frequencies see this test: http://www.fonerbooks.com/test.htm
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