Screen went dim and won't come back
I connected and external display and it works fine, I replaced the internal display with a new one and it is doing the same thing. Logic board?
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If it works with an external display the logic board is probably good. The most likely cause would be the inverter board or the cable from the logic board to the LCD.
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This is just a guess but the back light of the display could be a separate circuit then just the LCD it self. I ran into that once on an IBM.
Good Luck!
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