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Projection QOTD

Discussion in 'Question of the Day' started by LavaASU, Dec 31, 2014.

  1. LavaASU

    LavaASU Active Member

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    Would a mod mind moving this as it seems we cannot post in QOTD anymore.

    Since this is a bit tougher than most... perhaps students and people that aren't professional projectionist for the first week would make more sense?

    This is a 3 chip DLP projector thats unhappy.

    PJ error checkers.jpg
    Image 1 shows what should be a black and white checkerboard test pattern with a menu on top
    PJ error black.jpg

    Image 2 shows a black internal test pattern with a menu on top

    1. Whats missing?

    2. Whats there that shouldn't be?

    3. What part is causing this problem?

    4. Where would you (if you were going to be working on it) start looking?

    Note: I've already fixed this so this isn't a help me thread. I just thought it was kinda interesting and would give people an interesting challenge. Theres a bit more to this that I will post in a few days but it gives away answers to these questions.
     
  2. porkchop

    porkchop Well-Known Member

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    Hammer. Ask questions later.
     
  3. robartsd

    robartsd Active Member

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    Looks to me like the green is displaying some image that is not changing. I guess the first place I'd look is for a connection issue between the green chip and the controller.
     
  4. LavaASU

    LavaASU Active Member

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    Yep, it was displaying the trees image (yes, they're sideways long story unrelated) when it glitched and green stayed on that and the red and blue kept responding.

    So who wants to guess what connection was lost to have this happen?
     
  5. ThatsoundguyChris

    ThatsoundguyChris New Member

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    The green seems to have frozen so the green chip connection to te board?


    Sent from my iPhone using Tapatalk
     
  6. BobHealey

    BobHealey Active Member

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    Its been 3 weeks so I think this is safe to comment.....
    What is feeding the projector? That looks similar to an issue on a 2K dcinema unit I was asked to troubleshoot back in November. Everything had a red overlay, except the red in the test patterns.
    Solution to that one was interesting, and in my opinion, not satisfactory as it did not address the root cause. It turned out the IMB board had come loose from the backplane, causing spurious signals to confuse the ICP board, which resulted in the red overlays on all inputs and the ICP board's internal test patterns. The service company had to come out, use the secure key to open the projector, reseat both boards in the backplane, and then re-arm the crypto engine and remarry the two boards once all the tamper seals were reset.
     
  7. robartsd

    robartsd Active Member

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    Gotta love Digital Restrictions Management!
     
    LavaASU likes this.
  8. LavaASU

    LavaASU Active Member

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    Yep, that BS being why I have zero interest in dcinema projection. They break enough without adding things intended to make them break.
     
  9. robartsd

    robartsd Active Member

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    As a consumer, I choose not to purchase any media with effective DRM (I don't mind it nearly as much when applied to freebies and rentals). Thankfully the music industry seems to have gotten over its facination with DRM, but I fear it will be a much longer road before (if ever) the film industry accepts that DRM does more harm than good (hindering use of paying customers while failing to actually reduce piracy).
     
  10. LavaASU

    LavaASU Active Member

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    So I guess I will give the answer. It was the power connector to the green formatter board that was loose. So the green formatter (and DMD) lost power while showing the image, andtherefore did not have time to reset. Generally with a signal loss the formatter would reset/default and clear the image.
     

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