It appears this is a really old issue. As I read https://www.google.com/#q=how+to+remove+flies+from+hdtv I get the idea this is not easy to correct. And a tech or service call can be a shock. You'll have to weigh if it's worth the risk of doing what others wrote in the past or having a tech clean it up. Ask the tech to seal this up after they get it done.
I have a 40'' led 3d Samsung tv about 2 1/2 yr old( can't remember the model ) ,I have just noticed there are quite a few black cornflies / thunderflies inside the screen, how do I get rid of them, I am really disappointed with this I thought the screen would have been sealed to prevent ingress of any form of insects. Thanks for reading this