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Message: <blockquote data-quote="chscag" data-source="post: 1604334" data-attributes="member: 46727">There is a fuse that protects the backlight circuitry according to other threads that I've read but whether that's it or not, I can't say.  Are the breakouts from ifixit detailed enough so that you can make a comparison?My first suspicion was a cable because of the numerous cables that snake their way through the hinge area.  But what you said about not removing the battery makes sense.  A schematic diagram would be handy but Apple is so protective of their products that getting hold of a schematic is like trying to get hold of US Atomic Secrets.There are lots of similar problems as yours so perhaps if you do some searching you may be able to find something that might help to pinpoint where to look.</blockquote>