Dell Inspiron 7559 Screen Tearing Problem

I love this laptop but i've always gotten bad screen tearing on it for most games and have no idea how to fix it. Some i can just put vsync on but sometime even if i do it doesn't work. Minecraft gets really bad screen tearing with or without vsync on and i've tryed other setting to which haven't worked. Overwatch i can't play unless i have vsync and trip buffering on because of the bad screen tearing. I don't relaly see how when i thought one of the resolution option is to keep it at 6p fps which i'm sure is what the screen is but i have no idea. And there's no adaptive vsymc on this laptop compared to others. I did get screen tearing on others like final fantasy 13 but i was able to fix that by turning on FXAA. Don't know why that fixes it but it did. Please can someone help!