Oh... I get it, I didn't notice the board (tcon) on the back of the panel.
The monitor is so slim that I didn't check on the other side of the connector.
The good news is that the warranty for the PB279Q is 3 Years! and Asus sent me in a couple of days a refubished working monitor

Probably as you all said the problem was the fuse on the tcon.
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