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How low has the brightness gone? If it is very dark and you can barely see anything on the screen, it may be that the inverter board has failed and needs replacing.
The problem could also be caused by the screen itself, or the motherboard, but the inverter is the most common solution.
You tried setting the Brightness to maximum, but the screen remained dark? Could be a problem with the LEDs that light up the screen. Also try turning it off and back on.
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