How would I go about repairing my tv?

Hi, I have a Sharp tv, model #: LC-50LB481C. I've done several kinds of tests. Hard resets, leave unplugged for a few minutes, plug things with their own video source (like a video game console) into different HDMI ports etc,. The screen is completely dark but I can see the screen if I shine lights on it, this tells me I have a backlight problem. How would I go about fixing it? Does Ifixit sell parts for that and if not do you know where I can get parts either in Canada or shipped to Canada?