No keyboard illumination

1. Go to Keyboard system preference pane and make sure the "Illuminate keyboard in low light conditions" check box is checked. Try using system in a dimly lit environment.

Note: The keyboard illumination is not bright enough to be seen in most well lit spaces. In order to view the key being illuminated, the ambient light needs to be dim.

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  1. Check the keyboard backlight cable connection to the trackpad flex cable, if bad, replace the top case.
  2. Replace logic board.

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