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I have an HL-R5078w that just keeps going and going. I'd like this TV to last until 4K or OLED sets become more affordable.

The shadow is definitely not related to the collapsed light tunnel issue. It is in the center of the screen, sort of round and about 3" in diameter. It's only visible when the scene has a light background, and you can still see the image through the shadow. The edges are well-defined. I assume this means a piece of debris has settled somewhere in the light path after the color wheel. I replaced the color wheel on this TV myself, so I'm comfortable with taking it apart to fix the problem. How do I identify where the debris is and what's the best way to clean it?
 
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