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  • Clean the board up using solder wick -- if there are shorts like those mentioned in Jot's answer, it may clear them up. Also, if you need an Arduino to solder into a circuit, just start with one that doesn't come with pins soldered on already -- eg, a Nano or Micro. You can buy half a dozen of each for the cost of the time to take the pins off an Uno. Commented Jan 24, 2017 at 21:30
  • If I may suggest, there are "minimal" boards around you can buy for a couple of dollars that just have the basic processor on them. This could be a better solution than heating up your Uno (probably quite a lot) to get rid of the existing pins. Commented Jan 25, 2017 at 5:16