The snowflake patch in the nec projector image is due to the damage of the digital micromirror of the optical chip inside the projector, so that the image projected by the projector will appear partial color phenomenon. The solution to this problem is to replace a new chip, but the replacement operation of this chip requires opening the shell of the projector, but due to the high voltage inside the projector, It may cause harm to the human body, so you'd better ask professional maintenance personnel to replace the chip, and also send the projector to the maintenance station to replace it.
The projector has snowflake spots, the DMD chip is broken, and the area of snowflake spots may become larger and larger.