That sounds like a problem inside the tv and it might be time to consider replacing. I was looking at pricing yesterday, there are a great many on clearance for new models right now.
Every time I clean my mirrors, they end up having tons of streaks and almost look worse than before I started. What could I use to clean them that won't leave streaks...
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I just bought the house and trying to clean the stove I’ve tried everything but this spots are not going away and I really can’t afford a new one plus it’s a gr...
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If it is on the screen, rather than in it, you should be able to clean with a damp microfiber cloth.
See if this answers your problem.
http://www.fixyourdlp.com/2012/06/01/the-affordable-solution-for-the-dlp-tv-white-dot-problem/