I bought some dead 17" MacBook Pros for ~$20/ea from an e-recycler. I expected to just use their keyboards and maybe their LCD panels. But when I saw the PCBs looked fine, just didn't work, I decided to try to blindly reflow the major components. Well, it worked!
Check out my detailed post on my Blog: https://www.dawning.ca/2017/macbookpro-corpse-reanimations/