As I recall the manual for that projector says every 100 hours for the filter... did you?
If you don't clean/change the filter regularly then dust can build up in the light path that you are trying to cool reducing efficiency.
What you are describing is a melt down of the blue polarizer and that only happens because the light path gets too hot and that typically only happens if the filter loses air flow efficiency. A fan not running at peak speed could be a cause but that is rare. Dust build up on fan blades can reduce efficiency.
I am working on an article on all this but am still collecting information.
If you don't clean/change the filter regularly then dust can build up in the light path that you are trying to cool reducing efficiency.
What you are describing is a melt down of the blue polarizer and that only happens because the light path gets too hot and that typically only happens if the filter loses air flow efficiency. A fan not running at peak speed could be a cause but that is rare. Dust build up on fan blades can reduce efficiency.
I am working on an article on all this but am still collecting information.





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