Original post by: kevinweber ,
i agree with markus. if you can obtain a known-good top case you can test with, use it to see if it's the logic board or the top case's controller that went out. also, which smells worse, the underside of the top case, or the logic board? primitive method, I know. Is it also safe to assume you don't have AppleCare at this point? You had the logic board replaced for the GPU issue; that work is warrantied for a period of time. Even though the GPU still works now, if the top case connector on the logic board went out, and you're within (I believe 90 days) that part is still covered since it's all one unit.