EVAL-ADV7842-7511 Noise Interference lines

Hi, I have a EVAL-ADV7842-7511 Board which I'm using to decode CVBS signal from a Laserdisc player.

I have an issue where I'm seeing faint diagonal lines across the image. These are present on all of the input formats 10Bit, 24Bit and 36Bit and is also present on the s-video input. 

It it looks almost like interference. I've tried multiple cables and players and all produce the same results.

Any idea what is causing this?

many thanks

ken

Parents
  • So having done more tests and to answer questions above the lines are moving. They also disappear completely if I run the input script:

    Scripts 7 Simultaneous mode

    7-1a Port A, CVBS out through HDMI With HDMI Audio (PCM)

    However with this profile appears to disable the 3D comb filter. Could the lines I'm seeing be an issue with the 3D comb filter? I found this thread

    https://ez.analog.com/message/68430?commentID=68430#comment-68430 

    which sounds like a similar issue but I don't understand what the "SW driver REPEATER" is or where to find it. Can anyone point me in the right

    direction? Apologies at my lack of knowledge here. Any help would be much appreciated.

    Kind regards

    Ken

Reply
  • So having done more tests and to answer questions above the lines are moving. They also disappear completely if I run the input script:

    Scripts 7 Simultaneous mode

    7-1a Port A, CVBS out through HDMI With HDMI Audio (PCM)

    However with this profile appears to disable the 3D comb filter. Could the lines I'm seeing be an issue with the 3D comb filter? I found this thread

    https://ez.analog.com/message/68430?commentID=68430#comment-68430 

    which sounds like a similar issue but I don't understand what the "SW driver REPEATER" is or where to find it. Can anyone point me in the right

    direction? Apologies at my lack of knowledge here. Any help would be much appreciated.

    Kind regards

    Ken

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