hopefully someone can help me with this because I am totally lost. I just got my vx3 in the mail today and took it out a bit after work and was detecting but it was getting hard to see the screen so I tried to turn the back light on and when I did the detector shut off. I tried a few different ways to turn it on through the menu but the same thing kept happening. I just put new batteries in it when I got it so I know it cant be that. so I was wondering if anyone here had any idea what I am doing wrong or is this detector broke already. Thanks for the help