SMPS gives "electric shock"
There is 4.7nF between primary and secondary (hopefully a Y rated capacitor for safety). If the N is connected to 230VAC relative to ground, it will pass about 400uA which may be perceptible. 

From information on the net, Argentina appears to use Australian style 3pin plugs with 230VAC 50Hz one side hot wrt ground. 

Maybe your plug connections are reversed or the outlet is wired incorrectly.