I am working on a main board for a Samsung LCD TV. One of the polymer tantalum capacitors is bad and I am replacing it. I have removed the capacitor and am trying to clean up the contacts and remove the old solder. But the solder on the contacts doesn't seem to melt at all with the two soldering irons that I have (a 15W and 30W). The two soldering irons get hot and can melt solder wire just fine, but for some reason, the solder on this board won't melt at all with them. Do I need a special iron to remove the solder on this board?
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Problem Cleaning / Removing Old Solder from Board
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Re: Problem Cleaning / Removing Old Solder from Board
Originally posted by Agent24 View PostWas it an SMD or a through-hole part?
Originally posted by Agent24 View PostHow are you trying to remove the solder?
I cleaned the solder tips (with sandpaper), checked that the tips were securely tightened, tinned the tips, and tried again, but the solder still wouldn't melt.
Originally posted by Agent24 View PostPhoto?Last edited by Tron82; 04-03-2017, 06:48 AM.
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Re: Problem Cleaning / Removing Old Solder from Board
You should first clean the area with high % alcohol, then add flux and fresh solder. Those components are much easier to remove with a hot air station.
I have a hot air rework station, and whenever my iron is melting any solder too slowly, I blow the area with hot air around 240C. Everything solder joint my iron touches melts like butter. Perhaps you could use a blow dryer or heat gun(6 inches away on low) if the other suggestions fail. I would also recommend buying low melt solder so you can blend it with the old solder to lower the melting point.
Be careful with the airflow and temperature though so you don't burn anything or blow anything away.
Also, cleaning tips with sandpaper really not ideal. Copper wool would be better, and if you want to keep tips fresh then make sure to tin them with solder before storage to prevent oxidation.Last edited by Hellfiya; 04-03-2017, 12:30 PM.
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Re: Problem Cleaning / Removing Old Solder from Board
These are easy to remove. Blast them with heat. Just get 50-60W iron. The problem is that perhaps these components are soldered with lead free solder. This means higher melting point and this means that you need more heat.
Week ago I've replaced the burned diodes inside a metal detector. Exactly the same situation. There were no problems with 60W soldering station.
You need hot air station if you are trying to remove/solder SMD part with more than 4 legs. ..Last edited by televizora; 04-03-2017, 02:18 PM.Useful conversions. I don't "speak" imperial. Please use metric, if you want to address me.
1km=1000m=100000cm, 1inch=2.54cm, 1mile=1609.344meters, 1ft=30.48cm 1gal(US)=3.785liters, 1lb=453grams, 1oz=28.34grams
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