slow moving ripple across screen

Discussion in 'Home Theater Projects' started by darron Z, Jan 25, 2004.

  1. darron Z

    darron Z Stunt Coordinator

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    when viewing dvds from my prog scan sony 755 through my xd300u mits projecter, i see a wavy line , or ripple effect , not staticy but clear wave that slowly rolls upward across screen every few minutes. what is this ,can i fix it? thanks Darron




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  2. Brian OK

    Brian OK Supporting Actor

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    Darron,

    I would hazard the quess that you have some line hash riding on your AC line. Boy, the causes could be a multitude of things. Do you have dedicated circuits for your digital gear vs your amps ? A sub AC panel for just your HT gear ?.
    This is a problem I have had in the past and I have taken so many steps to clean up my AC that I could not point to one thing that makes my noise floor so black, or my ancient Tosh RPTV look so clean. It is an aggregate of all things--- from dedicated circuits to Audioprism Quiet Lines, to even the esoteric ERS paper and ERS Z-Sleeves.

    I would recommend you go back from your projector and trace ALL your AC connections. Look around your home even and seek sources of AC noise. Unfortunately, they are everywhere. The aim is to quiet, or isolate them all so they do not contaminate your AV setup. It takes time, and money.

    Good Luck,

    BOK
     
  3. Chu Gai

    Chu Gai Lead Actor

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    Some diagnosis is in order to rule out matters.
    1) Borrow someone elses player and see if the problem goes away.
    2) Target has 12 foot? GE component video cables for $20 or so (they take returns). The connection or shield on your existing cables may be bad.

    Let's take it from there.
     
  4. darron Z

    darron Z Stunt Coordinator

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    i think it is more in the processing of the video , since it is not a constant . i dont see it on ntsc broadcast or directv, just under prog scan dvd . and i thought to rule out contamination because it is a clear line wave hardly noticable and every few minutes, wouldnt a signal contamination be more consistent?
     
  5. Derek_P

    Derek_P Stunt Coordinator

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    it could be heat from the projector... i was getting teh same thing when i had my projector on a table....it would look like water ripples
     
  6. Steve Griswold

    Steve Griswold Stunt Coordinator

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    I get similar things too on some dvds -- usually it's only visible on high-contrast/single color backgrounds (esp. FBI warnings). Even then, it only appears on certain DVDs and not others. On mine, it's a wavy line/ripple right through the middle of the set (horizontally) that usually disappears when the movie starts.

    I just got the whole house re-wired with new grounding circuits, and am using a monster stage 2 power strip/filter..thing is, I had the same problem with my old (1990) Sony TV , old DVD player, and old house. Strange.
     
  7. Wayne A. Pflughaupt

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    It sounds like a ground loop to me. If cable TV is involved anywhere, or if there is audio equipment plugged into two different circuits on opposite electrical phases, that’s probably the problem.

    Regards,
    Wayne A. Pflughaupt
     
  8. DavidLW

    DavidLW Stunt Coordinator

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    Some light dimmers, when in dim mode, will emmit EMF that can be picked up by long video cables run or if the cable is next to the dimmer. When ever my dimmer was in a dim mode I got a thin white line that slowly traveled up the screen. I would not get the line if the dimmer was off or fully on. The problem disappeared when I moved my player closer to the projecter. I went from a 35 feet cable run to 18 feet run.
     
  9. FrederickR

    FrederickR Extra

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    I don't know if resolve your probleme yet.
    If not.
    Try to send a non-progressive signal from your dvd to the VGA component/computer to let the DCDI do its work.
    projectorcentral has denoted some problem with progressive scan signal and the XD300.
    Maybe it will fix your problem.

    Thanks

    Fred
     
  10. Paul Carleton

    Paul Carleton Auditioning

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    This sounds like a ground loop. More than likely coming in from your cable and some piece of equipment you have in your system is completing it. Try disconnecting cable, Sat too if you have it, and see if it goes away. If it does you will need do start looking into methods to kill ground loop. An upward scrolling line is how it shows up in Video. If it were audio it would show up as a hum.


    If the unlikely event it is not coming through your cable. Get a three prong or two prong adapter and start putting it on different pieces of equipment to see if it goes away. One or more of those could be causing it.
     
  11. darron Z

    darron Z Stunt Coordinator

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    so far i havnt had too much time to tinker with it, busy building the theater room , but thanks for the tips, i will try them !
     

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