SOURCE: White dots on Viewsonic projector
after making a cleaing, if you still found the white dots, i think it is problem with DMD chips. you have to buy a replacement,
if your machine is ViewSonic PJD6221, congratulations, this model machine is used 1076-6038B DMD chips, at present, it is the cheapest DMD chips.
SOURCE: my ViewSonic PJD6221 Projector shows scattered white dots on the screen
Your dlp chip is going bad and cannot be fixed economically. Several of the mirrors on the chip are hanging up and they won't come back. It will just get worse. My Sharp XR32X is doing the same thing. New projector time.
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