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DLPC3478: DMD3010 sometimes Project the same Pattern at Internal Stream Mode

Part Number: DLPC3478
Other Parts Discussed in Thread: DLPA2005,

        DLPC3478(8.0.0.1 Firmware version); DLPA2005; DMD3010LC

       DLPC3478 runs as Internal stream Mode infinitely, Project 1D data. One PatternSet.

       One pattern-set has 7 pattern data, and each pattern data is different.

      Sometimes the projecting data is the same because the captured image is the same content.

       But We cannot know either the Projecting data  do not update(for example always Pattern_2)

        or the DMD Mirror remains the same position and do not flip.

      The probability is very slow and random, we can not find the way to repeat it.

       We Do not know the cause, can you give some advice about how investigate it?