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wildcat23

macrumors newbie
Original poster
Nov 7, 2011
2
0
I have an early 2008, 2.4 ghz core 2 duo white macbook.

Problem: when waking the computer from sleep or turning it on, the backlight on the screen turns off. Pressing F1 all the way down (turning brightness down), and then pressing F2 slowly (one brightness block at a time) turns the light back on. But it is prone to go off again, in which repeating the above steps turns it back on.
Sometimes the screen light goes off at 1 block intensity, and so I have to repeatedly press F1 all the way down, F2 to turn it on, ..screen goes black immediately, press F1 again, press F2 again.. and so on, until the backlight stays on.

Once the backlight is on, nothing makes it go off (i.e. moving the computer/moving the screen up and down).

Apple store took it apart, said the inverter cable/board were fine, and only speculated that it was either the battery (134 cycles, showing 3 hours of life still left on wifi as i type this), LCD screen (but that works fine once the backlight stays on), or the logic board (computer performance in all other areas is great).

any other ideas on what it could be?
 
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