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DLP4710EVM-LC: the light control function has some problems that the projector only displays half of the image

Part Number: DLP4710EVM-LC
Other Parts Discussed in Thread: DLPC3479

Tool/software:

Dear Support team,

The problem is showed as above. When I use the light control function , the projected pattern only shows half of it and the other part of screen is the homepage picture . However , other fuctions like "display" and "video" are normal. I have tried to update the firmware , but it cannot solve the problem. 

Best Regards,

Zhiyuan Liu

  • Hello Zhiyuan, 

    Can you confirm this is using the DLP4710EVM-LC and not a custom board? Can you also provide the firmware version currently running? Do you see this issue in just splash mode or test pattern mode as well?

    best,

    Maximus

  • Hello,

          I can confirm that is DLP4710EVM-LC. The firmware version is "dpp3479-dual-ASIC_8.3.0". I can only see the issue in light control mode .The splash mode and test pattern mode are normal.

  • Hello Zhiyuan,

    Thank you for the information. We are looking into your issue and will get back to you within the next few days.

    Best,

    Maxine

  • Hi Zhiyuan,

    Can you explain in further detail what steps you take to reproduce this issue?

    Best,

    Maximus

  • Hello Maximus,

          The issue is occurred anytime when I use the light control mode. I just set 1D pattern and load them into the projector . Then I clicking the "Run continuously" buttom , the issue occurs. In a word , I follow the steps given by GUI user's guide. Also , I haven't programmed the firmware . 

          I remember that the last time the light control mode is normal , I stopped the patterns from displaying and didn't turn off the projector . About 1.5hours later, the projector occurred the issue and it occurs anytime.

  • Hello Maximus,

              I would add that I use a jumper connecting 2 pin and 3 pin of J7 to get TRIG_OUT2 signal. When the issue occurs , the TRIG_OUT2 can output the normal square wave.

    Best Regards,

    Zhiyuan Liu

  • Hi Zhiyuan,

    Thank you for the information, I will get back to you as soon as I have additional information. 

    Best,

    Maximus

  • Hi Zhiyuan,

    Could you try re flashing the latest firmware v8.3.0? Can you also try probing the Seq_Sync signal between the two DLPC3479s as well as confirm you see I2C communication between them when switching to internal pattern control mode?

    Best,

    Maximus

  • Hello Maximus,

    I wonder how to probe the Seq_Sync signal and I have some questions.

    1, According to the user's guide of DLP4710EVM-LC , it seems that the connector J36 of DLP4710EVM-LC is the remaining test point of DLPC3479 . However , the user's guide says that it is not used , thus , I wonder whether I can use the connector .

    2, the user's guide dosen't mention the definition of the J36's pins , so , I don't know which of the pins can be probing the Seq_Sync signal .  

    Can you explain them?

    Best Regards,

    Zhiyuan Liu

  • Hi Zhiyuan,

    1. You may probe the Seq_Sync signal ay TP266 on the PCB which can be found on the schematic or board file. 

    2.For now you should be able to probe testpoints on the board, this connector should not be needed

    3. J36 has some of the trigger out/in signals routed for light control modes.

    Please also start by updating the firmware using the TI DLP Pico Firmware Selector Tool and testing probing the I2C lines on the PCB between the Primary and Secondary controller so that we may verify both controllers are receiving proper instruction. 

    When you are seeing this issue do you see D34 or D33 LEDs light up?

    Best,

    Maximus

  • Hello Maximus,

    I can see both D33 and D34 light up in the issue . And they light up since I turn on the Projector ON/OFF Switch(SW21) . I also update the firmware through TI DLP Pico Firmware Selector Tool and the issues still happens . The D33 and D34 still light up since I turn on the SW21.

    Additionally , since I update the firmware , a new issue occur . In light control mode ,sometimes this new issue occurs.

      

    figure 1

    figure2

    figure3

    figure4

    As you see in figure1&2 , the new issue occurs randomly , in the left part of the screen occurs unnormal patterns . The figure3 is the old issue.The unnormal patterns doesn't occur everytime. And I find that when I use my finger touch the pin2 and pin3 of J9 , the left part of screen will change . Then I use a jumper connect the pin 2 and pin 3 of J9 , as you can see , the issue solved . However , before the issue , the pin2 and pin3 of J9 don't need to be connected. I wonder what make the issue occurs? It seems that is none of the firmware's bussiness , because I re update the EVM's firmware v8.3.0 , the old issue still can be solved.

    Best Regards,

    Zhiyuan Liu

  • Hello Zhiyuan,

    For light control modes pin  2 and 3 of J9 should be connected, do you still see the other issues with updated firmware and pin 2 and 3 connected?

    Best,

    Maximus

  • Hello Maximus,

    There are no issues. I appreciate your patience!

    Best,

    Zhiyuan Liu