Does this happen on all sources, inputs, and the picture test?
Happens on HDMI when i was watching a blu ray. It happens on normal TV source as well, like youtube or the internet. Picture test doesnt look bad, but it is a bright picture so it is hard to tell. The worst is when watching a blu ray because of the black bars at the top and bottom show the light bleed and you can see on the picture as well during dark scenes.
This is something that will require service since it happens on all the sources, and inputs. Can you shoot me a private message with the full model and serial number so I can look into this for you? http://bit.ly/2sSxapD