You should go buy a new laptop. It is the Nvidia Chipset. He said it needs to be Reflowed using a BGA machine. That is still not a permanent fix for this problem if it fixes it at all. Its about a 50/50 chance of success. It can still overheat and fail again in a month, a week, a year. No way to tell for sure. Dont buy a new board on ebay. Just suck it up and scrap it.
I work on laptops and board repair all the time. This is such a major defect we would not even warranty our work on boards that contained any of the defective chips.