There might be an issue either with your DMD board or your Video board, with the tv on, go to the menu, and if those white dots are still there the issue would be with your DMD board but if those dots magically don't show up on the menu, the issue would be with your Video board
SOURCE: sony grand wega kdf 50we655 blue dots everywhere
thats a common symptom for that model which is usually related to the optical block. Very exspensive repair. Check with a sony authorized repair center as Sony has recognized the problem and offer assistance with certain models yours may be one of the ones affected.
SOURCE: Sony Grand WEGA KF50WE610 50 blue hue blue dots
This model also has a paper filter for the Optic block that should be changed. No one ever said anything about it. shortens the life of the optic block if not changed.
SOURCE: Blue Dots on the screen of my Sony LCD Projection TV Model KDF-50
Did you check the lens to see if dust or residue may be on the projector. You may need to call a repair technician to open up the screen and look inside
Hope to Help
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