This sounds like a driver issue, either that or a problem with the GFX reading the info that the TV(and possibly monitor) is giving it. I had a lot of problems with a TV once, where i couldn't get any res, and did a lot of research on it. If your TV is 50in then you should have a much much higher resolution option. I've got a 37in Vizio, and i can get up to 1920x1080 on FFXIV. A lot of times if your comp is using the default monitor driver(not gfx driver), and the TV or monitor isn't designed to feed the comp its supported res you need a driver to tell it[gfx] what is supported. So my advise would be to search for drivers for both, install them, and reboot. Then like the other poster said, adjust your res higher. Then try the config utility again.