only 1 earphone working with win amp
 

as the title says only 1 is working more specific the right one work but the left doesnt its not my sound card and its not my computer or headphones it only happens in winamp

Did you check Winamp's balance? It will vary with the skin. In all classic skins the balance slider will be found in the player/main window. In the Winamp Modern and Bento skins, the balance slider is in the Equalizer.