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TFP401A: HDMI to LVDS interface for DUAL LVDS Display

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Replies: 5

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Part Number: TFP401A

Hello,

thanks in advance.

I have designed an HDMI to LVDS interface to drive 19" DUAL LVDS screen "G190ETN0"as below:

but I have an issue with the displayed output as shown below even that the RGB mapping is correct:

regards

  • below is the schematic 

    7026.SCH.pdf

  • In reply to shadi maalwani:

    Hi Shadi,

    You have the TFP401A configured for falling edge data strobe while the DS90C387 is configured for rising edge data strobe. Can you try connecting the R_FB pin on the DS90C387 to ground?

    Regards,

    I.K.

  • In reply to I.K. Anyiam:

    Dear I.K,

    thank you for your support.

    actually I tried connecting R_FB as per recommendation but the issue not solved.

    we were sure that odd/even channels on TFP401 are connected correctly to odd/even channels on DS90C387.finally, by swapping ODD Channel with EVEN channel at the LCD panel "G190ETN0" cable side, then it's working as it should be. 

     the original cable was working correctly on a PC motherboard. is it possible that odd/even naming convention is swapped on any of these chips?

    is there any configuration bits/input pin or chip version that could swap odd/even channels?

    regards

    ShadiG190ETN01.6_pinout.pdf

    Shadi

  • In reply to shadi maalwani:

    Kind reminder

  • In reply to shadi maalwani:

    Hi Shadi,

    Sorry for the delay. Odd/even naming convention isn't swapped on any of these chips, and there is no configuration bit, input pin, or chip version that can swap odd/even channels. It may be that the odd/even naming convention is actually swapped on the panel you're using.

    Regards,

    I.K. 

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