Hello, I own an LG G4 and the phone had a sudden d...

Hello, I own an LG G4 and the phone had a sudden death. I was told that it has no fix and that it is a motherboard problem. The same problem had many people in the world. I want to go visit an LG office in New York, since I'm traveling for April 20th. Can someone inform me of an exclusive LG store? Thank you.