I have a 6 month old 9G Kuro which appears to have developed some screen burn from the on screen display of my Onkyo 876 amp. When muted, the Onkyo OSD displays 'Muting' in bright white letters in the bottom corner of the screen. It has never been abused and left for hours on end, and i never saw any retention in the first few months so didn't think about deactivating the OSD. The display didn't seem to have an issue with it.
Now however if i display a very bright white screen, i can clearly see 'Muting' in a feint grey color(like a shadow) as if the display has faded where those letters have been displayed. What is odd though, is if i bring up one of the grey onscreen menus of the kuro(such as the AV selection menu) so that the menu is nearby but not covering the shadow, then the shadow disappears even though the screen brightness remains the same. What is causing this effect?
I have tried running full screen 100IRE windows and white noise for over a week but the shadow hasn't faded.
Thanks for any help