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Hi,that's an issue with the light engine.Basically there's 3 chips blue,green and red they create the image on the tv ,when they start to fail you'll get those spots all over, mostly in the corners.God bless you!
This could either be an issue with your DMD board or your Video board. While the TV is on, go the menu, if that green spot shows on the menu, the issue will be with the DMD board, but if it doesn't the issuw will be withe the Video board
those are going to be dust spots on the LCD panels internal to the optical engine. i suggest that you take the screen off and take off the panel i nthe middle of the tv with 2 screws in it and there will be an area that has 3 metal fins covering thin orange ribbon cables. the 3 square objects at the end of those ribbon cables will be the LCD panels spray wiht air compressor unitl clean and that should greatly help your problem.
go to the menu select the screen option 3 and then select option 6 . adjust projection tv. green is for green use it first then adjust the red and blue until the patterns on the tv screeen appear white.