I have a 50" lg plasma TV power and sound works but fashes green then black

[bigbodyboi25]

I have a lg 50" plasma flat screen tv power and sound works but on power up screen lights up flashes green then goes black but back light stays on how do I fix it?

 

[Power94]

if you have receive then go where you buy it if the warranty is good, if not buy new one bcs repair gonna cost you more then the new one