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DLP4500NIR: DMD is not projecting patterns with no error messages

Mohamed Shehata
Prodigy 10 points
Part Number: DLP4500NIR
Other Parts Discussed in Thread: DLPLCR4500EVM, DLPC350, SN74HC21

Hi everyone,


My DMD was working perfectly fine until suddenly it stopped working for some reason. The mirrors are in the parked position and it does not seem to switch on or off. I tried uploading different firmware, using different ports, restarting the PC, and resetting the DMD using the GUI and the white button next to the power supply. there are no error messages on the GUI. I know that the mirrors can move because when I select the power stand by and go back to video mode the mirrors move.

When I move the DMD chep away from the bored led D16 lights up, and when I get it close to the bored again it turns off and the DMD flashes (mirrors on the on position) and goes back to the parked position again.

  • 0
    TI__Expert 8160 points

    Hello Mohamed,

    Welcome to the E2E forums and we hope to assist you with your questions.

    Here are some questions to further debug the situation

    1.Is this a DLPLCR4500EVM from TI.com or is this your own board design?

    2.What is the power supply you are using and the voltage/current specs? TI recommends a 12v supply with 6-7A per the users guide.

    3.Can you check these LEDs on the board? The LED on the bottom and the D4 LED?

    Let me look into D16 LED further. Thanks for your patience.

    Regards,

    Alex Chan

  • 0 in reply to Alexander Chan
    Prodigy 10 points

    Hi Alex,

    Yes That is the DLPLCR4500EVM. I just dismantled it to the components you see in the photo.

    The power supply follows the user's guide.

    D4 is blinking, and D7 is on. 

    Best,

    Mohamed 

  • 0 in reply to Mohamed Shehata
    TI__Expert 8160 points

    Hello Mohamed,

    So I looked into D16 further in the schematic which you can find all the design files including the schematic here: https://www.ti.com/tool/DLP4500-C350REF

    D16 is a RED LED that is controlled through FETs by POSENSE signal.

    Here is a quick description for POSENSE from the DLPC350 datasheet.

    POSENSE is the output of various power rail checks all connected together into the SN74HC21 AND gate.

    If one of those inputs is low it will cause POSENSE to go low and turn on the red LED D16 indicating some voltage is below operation.

    You may have to probe around the various input signals into the SN74HC21 AND gate and you can also double check power rails on your board to see if any are dropping or incorrect.

    I would also double check the connections of that flex cable with the DMD on it since you said you were moving that around which caused D16 red status LED to turn on.

    Regards,

    Alex Chan

  • 0 in reply to Alexander Chan
    Prodigy 10 points

    Hi Alex, 

    The D16 is only turned on when I move the DMD, otherwise it is off. And eventhough it is off the dmd is still not projecting patterns.

    Best,

    Mohamed 

  • 0 in reply to Mohamed Shehata
    TI__Expert 8160 points

    Hello Mohamed,

    I would check the following.

    1.

    I would check the following power signals. All of these are related to the DMD input power signals or power rails and first ensure these are all in specification.

    2.

    Can you also send a picture of your GUI settings. I assume the LED current values are non zero.

    You can also click save solution and this will save all your current GUI settings in an INI file and can you please send that to me as well. 

    3.

    Can you try reflashing the base firmware version 4.4 found here if you have not tried that aleady: https://www.ti.com/tool/DLPR350

    Regards,

    Alex Chan

  • 0 in reply to Mohamed Shehata
    TI__Expert 8160 points

    Hello Mohamed,

    I am closing this thread due to inactivity. If you have any further questions please create a new E2E post.

    Thanks,

    Alex Chan