How do I change back the Nvidia web driver scaling with no picture?

Hi guys!

 I have a 4k TV and after installing Nvidia drivers, all well, when I tried to scale to the max resolution 4096x2160 I got no image. I uninstalled the driver with nv_disable, installed again but same. After the logo the picture goes off. Is driver preferences saved after uninstall? Where do I find them? 

Thanks