No picture on LCD tv but sound works!

Question

I have a LG 32lc7D-UB and for the past week or so i would get a bunch of white lines on the screen then the picture would pop up. Now nothing happens it just turns on and i can see the screen is on but there is no picture but the sound still plays. I did a little research and seems it may be a backlight problem my question is can i replace it myself to save me from paying 600$ to fix a 600$ tv. or is it something i should get checked first to make sure it is the backlight.