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Hacking a Projector with a DLP chip

Andre16038
Expert 1915 points

Hi, I have this Optoma, projecto that has a dlp2800 is the same chip that comes with the pico projector kit, when I start the projector the optoma logo shows up, so what I want to is have a timer circuit to cut the power from the LEDs for about 5 seconds, so I wont see the Optoma logo,  for someone who is very familiar with this projector circuit where can I cut the power to the LEDs from without interrupting the rest of the circuit?

Regards,

Andre

  • 0
    TI__Genius 9935 points

    Andre,

    This projector does not have the same DMD as the Pico Kit v2. The DMD in the Pico Kit v2 is the DLP1700 (see http://ti.com/mems).

    I can't help you with your question. The projector is an Optoma product (using a TI DLP DMD, of course). What you are asking about is not a "feature" of the DMD. It is Optoma's system firmware, working with the specific hardware of the Optoma projector.

    Best regards,

    Pascal

  • 0 in reply to Pascal DLP
    Expert 1915 points

    HI Pascal thanks for your answer, my idea is to put a switch between the DLP and the LEDs with out touching the Optoma firmware or their other circuit, I'm just abit confuse with the circuit between the DLP chip and the Projection LEDs, so I was looking for some ideas.  wouldn't the hardware would be pretty standard between the DLP and the LEDs?

    Best Regards,

    Andre

  • 0 in reply to Andre16038
    TI__Genius 9935 points

    Andre,

    The hardware between the DLP and the LEDs may or may not be similar. That is the function of the LED Drivers, and can be implemented differently by different manufacturers. You can see how it is done in the Pico Kit v2 by looking at the schematics, which are available from http://digikey.com/pico. Of course, I don't have access to the schematics for the Optoma projector.

    Best regards,

    Pascal

  • 0 in reply to Pascal DLP
    Expert 1915 points

    Pascal, of course I understand it may or may not be similar, but on Pico Kit v2 what would you do to cut the power of the leds while the circuit still  on meaning it would think still processing image, but it does not know the leds are not on.

     

    Best Regards,

    Andre

  • 0 in reply to Andre16038
    TI__Guru 54705 points

    Andre,

    Have you checked the user's manual for the particular projector.  You should be able to access it from the Optoma website.  http://www.optomausa.com/support/manuals.aspx

    Some of the Optoma projectors allow you to load in your own splash screen that displays instead of their "Optoma" screen.  If so, you could just load in an all black screen.

     

    Fizix

  • 0 in reply to Andre16038
    TI__Genius 9935 points

    Andre,

    For the Pico Kit v2, I believe that to turn off the LEDs, the only thing that you have to do is to pull the signal LED_ENABLE low. See page 3 of the Pico Kit main board schematic (MAIN BOARD-12142009.pdf).

    There is a 10K pull-up resistor (R223) and an unpopulated 100K pull-down resistor (R271). If you simply ground this node, the LEDs should go off.

    I have not tried this myself.

    Best regards,

    Pascal