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DLP4500NIR: How to detect a defective DMD

Alexander Hill
Prodigy 50 points
Part Number: DLP4500NIR
Other Parts Discussed in Thread: DLP4500

We are testing a brand-new DLP4500NIR DMD in our Lightcrafter 4500 development kit, which we've deconstructed for structured light purposes. The stock, visible-light DLP4500 works perfectly, however the DLP4500NIR replacement is scrambled and seemingly cannot display anything other than a grainy version of the default test image or random noise. We cannot get the DLP4500NIR to operate in Video Mode using the Lightcrafter 4500. We suspected a problem with the board or the connector, but the visible-light DLP4500 continues to work perfectly. What tests should we do to determine if the DLP4500NIR is defective?

  • 0
    TI__Mastermind 30600 points
    Hi Alexander,

    Can you attach a picture of how you are attaching the NIR DMD to the flex cable? Any chance you've rotated it 180 degrees?

    If your board works with the DLP4500, then it is unlikely that the board is broken.

    -Paul
  • 0 in reply to Paul Goedeke
    Prodigy 50 points

    Hi Paul -

    Below is a picture of my current mounting. It is mounted parallel to the cable (I've seated the connector as well as I'm able). I *believe* it is correct - it's the same orientation I used for the DLP4500. You can see the problem in the picture - the default test image is displayed, but it is scrambled. I'm also unable to clear this test image with any pattern sequences or video mode. There are also some transient artifacts (banding, lines, blocks) which disappear after a few seconds.

    Thanks,

    -Alex

  • 0 in reply to Alexander Hill
    TI__Mastermind 30600 points
    Having never taken apart one of these engines myself, does the DMD only fit one way on the flex cable?

    I'm surprised that you see this issue on the NIR and not the DLP4500. If the flex itself were damaged, I would expect the same behavior on the DLP4500.

    Given that these devices are electrical identical, there must be something wrong with your NIR DMD. I recommend that you order or find another to test the board with.

    -Paul