Hardware what kind of component is this that has skipped me?

frangato

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Good evening, excuse my English, it is very poor, I am Spanish and I am not good at the language. I am trying to find out which is this component that when installing sx lite has jumped and disappeared. I attach the photo to see if someone can help me. I apologize if this is not the right place to ask. Thank you so much for your attention.
As I can not upload image to be new here, I will say that it is the last where the chip is soldered in the lite switch, after placing the chip.
 
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