Hi, I just read your post and I'm having the same problem with 3 g5 iSights. I've recapped fully them all, and no chime, full fan, and black screen with only led's 1 and 2 on. Did you find a solution? I've gone over the solder again on each, just to make sure no cold joints but perhaps there still is some? Thanks for an info on your fix!
Matthew
Matthew