Backlight fuse for this model is F7700. You can locate it in the attached picture (it's the highlighted component, the large component in the top left is the display cable connector on the logic board). To test with a multimeter, put the meter in DC voltage mode, then put one terminal on ground and the other on pin 1 of F7700 to see if the voltage is present before the fuse, then on pin 2 to see if the voltage is present after the fuse. You can use one of the screw well areas on the board as ground if needed. Good luck!
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