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    One can only speculate, especially with regard to the current condition, but it's likely that either F1 was activating or T1 was getting hot. Excessive current consumption can be a result from past damage, however it is also quite possible that the reset behavior you see with a 9v battery has nothing to do with this incident, and everything to do with the fact that 9v batteries are very weak and a poor choice for powering an Arduino. Commented Jul 17, 2017 at 15:07
  • I think it probably did not damage any components, and the smell probably came from the plastic that started to burn because of the high current, but for sure if you left a little more, something could have been damaged. To be sure only by testing component one by one. Commented Jul 17, 2017 at 15:09
  • @ChrisStratton I didn't understand what F1 and T1 are ? I don't use batteries for powering my arduino but just wanted to test the external power. You may be right about the 9v battery, but what about the burn smell ? Commented Jul 17, 2017 at 16:57
  • @AndrewPaes What plastic part do you mean ? on the board ? I don't know how can I test component. I don't even have voltmeter and such measuring tools. :( But the smell is from the regulator or just something near it. I can't determine. Commented Jul 17, 2017 at 16:59
  • Could it be that the reverse polarity diode failed closed with high resistance? Commented Jul 17, 2017 at 20:09