I have a Vizio TV model number E420VL. I removed all the screws on the back, but it will not come off. The problem seems to be in the lower right corner. Is it possible the coaxial port could be the problem? I see screws at the top, left, right, and bottom. There are also screws to remove the base/stand. I also see screws on the right bottom part around the ports, including ones just up and right from there and on the right side where there is a side HDMI and USB. I removed all of them, but I am wondering if the coaxial port is the issue. Any help would be appreciated. Thank you in advance.