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I disconnected my LCD screen on accident without removing the battery. I smelt a burnt fuse smell. When I use my new LCD screen there is no backlight. I checked the fuse with the small dot on it, and it looks intact. Do I need to replace the fuse regardless? Do I need board repair? Any help would be appreciated. Thank you for your time!

You’ll need to test continuity of the fuse a visual inspection is often not enough. But lets see if the backlight fuse is blown by using a flashlight shining through the Apple Logo. Are you able to see the desktop icons? Update (03/13/2018) Well, you’re lucky! The backlight logic is damaged. Hopefully its just the fuse link. At this point I think you’ll need to visit someone who has the needed parts and micro soldering skills.