Just a word on the reflow techniques
Although it might work the problem though comes when you have thermal sensitive components and also the fact that smaller components tend to heat up faster than larger components.
It's why when they make these cards thermal flow soldering (solder bath or hot air) is only used to tin the cards and element soldering (heat at only point of contact) is used to place most components but for the larger components friction welding is the most common method and one that can't really be used at home
So heating in an oven can work (if the cards bust and out of warranty) but remember that any card made in the last 5 years will use a non lead solder and depending on what's used it's doubtful that it'll melt the solder in a standard oven. Also those who have found success are probably not reflowing the solder but actually removing the impurities within the "dry joint" making a mechanical connection possible but not one that is in effect welded.. In that case there's always a strong chance it may fail again soon.
But if it's a duff card then there's not a lot use for it anyway
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