The back light is the light and in OLDER laptops with CCFL TUBES you had a part/board/circuit called an inverter to supply the needed voltage to the tubes.
But let's step even further back. Why would we need to know this plus why would we want an old design?
Bob
Is a back light and a inverter the same thing on a lap top there's not a lot of mention direction wise of which part is which i'm confused what a back-light is are these two mean the same thing

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