blowing south bridge with hot air?

As long as you make sure that the mainboard is level before you start heating it up you should be fine. A trick to not warping the board is to heat up the opposite side first and then turn it over and heat the area your trying to resolder. When try to rework a board I stay about 6" from it and use a small circular motion while heating the area.

KORISNIK wrote:

If you get hold of a similar board to practise on and a non-contact infra red thermometer you can get an idea of how long you need to heat , heat setting/distance/ orientation etc, before some parts will overheat