preheat oven to 200*c/ 375*f range. strip mobo of all plastic stickers use some no clean liquid flux for reflow work they sell it on ebay. on affected area like gpu. turn an aluminum disposable pan upside down and place mobo in oven leave for 10 minutes in already preheated oven then shut off and crack door to allow cooling after the ten minutes of baking are up. brought back a d620 nvidia so far works for over a year