I am trying to get my T5i set up with a Feelworld/Neewer 759 7" LCD monitor and can't seem to get the image from the camera to fill the screen on the monitor. It worked fine with my Canon G20 camcorder so I have to believe that it has something to do with the settings in the T5i.
The best I am able to get is a 5.5 inch diagonal measurement of an image and not the full 7". It may be that there is an issue with this particular monitor working with the T5i and I was hoping that someone has had some experience with this.
Let me know if you have solved your issue. Changing the resolution on mine to 1080i in the camera mode fixed mine. If you are still having issue, there is a man on YouTube who set one of these up to his Canon 5D so he might be able to help you as well. Here is the link to his current video. This is about using a Panasonic, but you can contact him through this YouTube channel.