I dont know if this is in the wrong section but it is a soldering issue.
I dont usualy have any problems soldering or desoldering things usualy and have just repaired a old crt monitor and soldering etc on this was easy. Today I have been trying to remove capacitors from a pentium 3 computer motherboard which is a mix of SMD & through hole. The problem I have is that I tin up my iron and hold it to the solder around the components leg but the solder just refuses to melt. These were only 68uf 6.3v electrolytics but i heated them for ages sometimes and they will not move. I can sometimes get a better result by holing some new solder against the leg and melt it onto the existing solder and then it will usualy help to get it melted although not always. Its like the solder on these type of motherboards is a different type and it doesnt conduct heat from the tip of the iron very well. there is no way I can desolder them with a suction tool because I cant get the solder to melt. Any solder I add to the existing solder still melts easily but the original solder underneath does't. Once I have the component out I can solder in the new one easily enough. I have a roll of RS cored lead solder I use which melts easily but Is this solder on these boards possibly lead free or some other solder and is there a special way of getting it to absorb the heat from the iron better.
I dont usualy have any problems soldering or desoldering things usualy and have just repaired a old crt monitor and soldering etc on this was easy. Today I have been trying to remove capacitors from a pentium 3 computer motherboard which is a mix of SMD & through hole. The problem I have is that I tin up my iron and hold it to the solder around the components leg but the solder just refuses to melt. These were only 68uf 6.3v electrolytics but i heated them for ages sometimes and they will not move. I can sometimes get a better result by holing some new solder against the leg and melt it onto the existing solder and then it will usualy help to get it melted although not always. Its like the solder on these type of motherboards is a different type and it doesnt conduct heat from the tip of the iron very well. there is no way I can desolder them with a suction tool because I cant get the solder to melt. Any solder I add to the existing solder still melts easily but the original solder underneath does't. Once I have the component out I can solder in the new one easily enough. I have a roll of RS cored lead solder I use which melts easily but Is this solder on these boards possibly lead free or some other solder and is there a special way of getting it to absorb the heat from the iron better.
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