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Original question:

DLPDLCR2000EVM: Inconsistent colors

DLPDLCR2000EVM: Color Imbalance - Green Tint

Matt Chan1
Prodigy 30 points
Part Number: DLPDLCR2000EVM
Other Parts Discussed in Thread: DLPC2607

Hi,

I recently set up the DLPDLCR2000EVM using the following guide.

The issue is that there is a consistent green tint when projecting the desktop from the BeagleBone.

chromium

Additionally, there is sometimes a grainy quality to the image.

However other things like the splash screen and several of the example images don't show any effects.

Any troubleshooting advice would be greatly appreciated!

  • 0
    TI__Genius 9971 points

    Hi Matt,

    Welcome to TI E2E forums!

    Kindly share the version no. of the firmware that you are using. We will try to reproduce the issue and get back to you within a couple of days.

    Regards,

    Mayank

  • 0 in reply to Mayank Khandelwal
    Prodigy 30 points

    Hi Mayank,

    Sure, I'm running this version - Debian 9.9 2019-08-03 4GB SD LXQT - from the latest images page of the BeagleBone site on an SD card.

    Is there any other commands I can run / diagnostic information I could provide to assist?

    Thanks,
    Matt

  • 0 in reply to Matt Chan1
    TI__Mastermind 28005 points

    Matt,

    Welcome to the E2E forums, and thanks for your interest in our DLP technology.

    If you are seeing color issues, you may have a connection problem between the BeagleBone Black and the DLPDLCR2000EVM. The EVM splash screen is stored internally, so it never passes through the headers connecting the systems.

    I recommend verifying that your connection between the systems is secure. Failing that, you should load up an RGB color ramp to verify which parallel video GPIOs are not sending data as they should.

    Let me know your results.

    Regards,

    Philippe Dollo

  • 0 in reply to Philippe Dollo
    Prodigy 30 points

    Hi Philippe,

    Thanks for the recommendations. To check the connection, I removed the spacers between the EVM and the BeagleBone such that the projector is almost completely seated in the BeagleBone header, but still encountered the same problem.

    Could you also clarify how to use the RGB color ramp to diagnose the video GPIOs?

    Thanks again,

    Matt

  • 0 in reply to Matt Chan1
    TI__Mastermind 28005 points

    Matt,

    If you have an image source with each RGB intensity from 0 to 255 is captured as a gradient, you can examine the individual codes to determine where the colors are incorrect. Alternatively, you can use an image editor to generate solid field images of a suspect code. 

    The DLPDLCR2000EVM has an internal test pattern generator featuring various solid fields and ramp patterns. You can compare these ideal outputs to your images to help identify the problem.

    To access the internal test pattern generator, you can issue the appropriate I2C commands detailed in the DLPC2607 programmer's guide:

    http://www.ti.com/lit/ug/dlpu013a/dlpu013a.pdf

    You will need to use commands 0x0B (source select), 0x0C (resolution select), and 0x11 (test pattern select) to achieve this.

    I hope this helps.

    Regards,

    Philippe Dollo