|On modern laptop designs, the GPU pins are directly below the chip, like a CPU. Unlike the CPU, these chips are soldered on the board. The question becomes, how do you get a solder iron between the chip and board to melt the solder and bind the chip? The answer is you don't. You heat the entire thing to the melting point of solder. |
I'm told factories use an oven to do this. Professional repair shops use a solder reflow station. Reflow stations are basically a hot plate with a heat lamp so you only melt solder on the one bit you care about. They cost more than a new laptop, so get one only if you're in the business of fixing laptops. But I can get a toaster oven at Walmart for $40, and it'll reach the required temperatures (though just barely). To protect the rest of the board, you cover the bits you're not fixing in aluminum foil. A toaster oven has more risks than a reflow station, but your laptop's ready broke, so what's the harm in breaking it more?
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