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Original question:

DLPC3433: When the temperature is higher than 60’C, the noisy screen happens.

DLPC3433: dlpa3010

Wladimir De la Cadena
Prodigy 220 points
Part Number: DLPC3433
Other Parts Discussed in Thread: DLP3010, DLPA2000,

Hello,

I just got the vertical lines on my display. Like the ones in this thread https://e2e.ti.com/support/dlp-products-group/dlp/f/dlp-products-forum/811235/dlpc3433-when-the-temperature-is-higher-than-60-c-the-noisy-screen-happens

It happened already 3 times. I am sure the power-down sequence is going well. I have my own custom board with the DLPC3433 and DLPA2000 connected to a display developed by a third-party vendor using the DLP3010. I have rechecked that  my power down sequence meets the requirements. Actually my SYSPWR is always there and I always driver PROJ_ON low before turning down the full system. I am now doubting about the cable that carries the LVDS and DLPA-power signals from my custom board to the display. Is there any other known potential cause that I should look at?

Wladimir

  • 0
    TI__Genius 12785 points

    Hello Wladimir,

    Welcome back to the E2E forum.

    Is your system able to boot without these lines since they have appeared? Unfortunately these are typically indicative of permanent damage to the DMD. I would guess that you are seeing the projection divided into 8 blocks with these lines. Is this correct?

     These lines are usually caused by timing or power issues on the DMD flex cable, which can be caused by a poor connection or hot plugging/unplugging. I suggest confirming proper DMD cable connection and that the power up/power down sequences are being followed. Additionally, please make sure that the timings and voltages at the DMD interface are within spec. In particular, confirm that the LS_CLK line meets the requirements in the DLP3010 datasheet.

    Regards,

    Austin

  • 0 in reply to Austin Snyder
    Prodigy 220 points

    Hi Austin,

    Thanks for answering.

    Actually I only see one line, and sometimes even just some dots. It has not been like lines dividing the image on equal blocks. Power down sequence seems ok for me. I pull PROJ_ON low and only after around 500 msec all the power supplies are going off. Actually the main SYSPWR for the DLPA does not go off after more than 4 seconds. When you mention poor DMD poor connection, that refers to all the lanes, or only the power for RGB? My cable carries both LVDS and LED power signals. Unfortunately it is a microcoax cable in which I cannot really test how goo the connections are.

    And about the timing, the oscilloscope shows a signal within the parameters. I will try to do a more strict control in software to drive PROJ_ON low even earlier.

    Thanks

    Wladimir

  • 0 in reply to Wladimir De la Cadena
    TI__Genius 12785 points

    Hi Wladimir,

    I recommend ensuring that all lanes are well connected at the DMD. My thought behind this is that it sounds as though pixel data is being dropped. It would also be ideal to ensure the timings in the case that this is contributing to a loss of data.

    Is this line/dots static or does it appear in a different area of projection each time? Do you have another DLP3010 DMD that you might place in the engine? Is there a particular configuration in which these dots appear?

    Regards,

    Austin