hello, I don’t speak english vers well.
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I have resolved the same problem by make one bridge on the backlight fuse (macbook pro late 2008). It’s easy !
I have test the fuse by an multimeter before make the bridge.
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Have you search on google with “macbook pro 2008 fuse”
https://forums.macrumors.com/attachments/img_1806-jpg.600752/
https://forums.macrumors.com/threads/macbook-pro-backlight-fuse-locations.1629823/