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820-2850 backlight wont come back if mac is on and not used for a while

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  • 820-2850 backlight wont come back if mac is on and not used for a while

    I have this board, backlight is OK while computer is on, but if you don't use it for like about 5-10, screen turns dim, this is normal. But when you hit any key or anything, backlight wont come back, although the screen is working and computer on. Any help?

  • #2
    Never seen that before. First inspect for corrosion of course. Then measure voltages after this has occurred, see if BKL_EN is still there and see what the output is on the LCD connector.

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