one night me and my mate was talking and he came up with the idea fixing dead mbs by un-soldering every component on a mb so its just the bare circuit board and then baking the bored to allow all the metal on the board to remelt... would this work..
No.
First, you would need to unsolder everything. apparently you don't realize how much of an undertaking that is or how much soldering skill would be required. Then you have to hope it doesn't catch fire or something while baking. THEN you have to re-solder everything you took off and put it back on.
And then you have to hope that the motherboard problem wasn't actually a timer chip or other component that had to be removed, that you soldered everything back on properly, And that by some bit of pure luck the bits of solder you left on the board melted in some magical way to fix the board. (since solder is pretty much the only metal used on the board at all that has a low enough melting point)
The thing is, motherboard problems are almost always with the various different Integrated circuits that are soldered onto the board. In fact, I'd say barring some sort of physical defect in the board (such as a cut trace) any motherboard issue is in fact tracable to some soldered component on the motherboard, often timer chips or VRMs. In which case, even in the best case scenario where you are able to actually unsolder and solder the tiny components using some sort of infinite amount of patience and an equally collosal amount of soldering skill, it wouldn't help since the problem was on one of the "components" that you took off and re-added. And even if it was a cut trace, baking wouldn't help since the metal used for the traces is not even close to having a melting point within range of a consumer oven.
