3LCD misalignment

Discussion in 'Displays' started by jmdanna, Jun 13, 2013.

  1. jmdanna

    jmdanna Auditioning

    Joined:
    Jun 11, 2013
    Messages:
    11
    Likes Received:
    0
    Real Name:
    Jacob D'Anna
    I just got a Panasonic PT-AX100U from eBay and set it up. Once I went to focus it, I realized it wasn't focusing all of the way. I came close to the screen and noticed the red and green were offset a little left to right. Up and down is fine. See these pictures.
    [​IMG]
    [​IMG]

    This is highly zoomed up on my camera. From a distance, it's harder to tell, but I think the image could be sharper if this was aligned properly. Is there any way for me to do this myself? Or will I have to deal with it?
     
  2. jmdanna

    jmdanna Auditioning

    Joined:
    Jun 11, 2013
    Messages:
    11
    Likes Received:
    0
    Real Name:
    Jacob D'Anna
    Anybody? Does this even look that bad? Am I worrying over nothing?
     
  3. Steve Tannehill

    Steve Tannehill Ambassador

    Joined:
    Jul 6, 1997
    Messages:
    5,547
    Likes Received:
    214
    Location:
    DFW
    Real Name:
    Steve Tannehill
    Belated welcome to HTF, Jacob!

    It looks like your convergence still needs adjustment. I'm not sure how to do this.
     
  4. jmdanna

    jmdanna Auditioning

    Joined:
    Jun 11, 2013
    Messages:
    11
    Likes Received:
    0
    Real Name:
    Jacob D'Anna
    Should I attempt taking it apart or is it easy to break things?
     
  5. Steve Tannehill

    Steve Tannehill Ambassador

    Joined:
    Jul 6, 1997
    Messages:
    5,547
    Likes Received:
    214
    Location:
    DFW
    Real Name:
    Steve Tannehill
  6. jmdanna

    jmdanna Auditioning

    Joined:
    Jun 11, 2013
    Messages:
    11
    Likes Received:
    0
    Real Name:
    Jacob D'Anna
    I think that is to move the entire image. So is it worth trying to take apart? Is it even possible to adjust the screens to have proper convergence? What would I be moving exactly? The LCD panels? Mirrors? Polarizers?
     
  7. Mark-P

    Mark-P Producer

    Joined:
    Sep 26, 2005
    Messages:
    3,077
    Likes Received:
    937
    Location:
    Camas, WA
    Real Name:
    Mark Probst
    LCD panels in projectors cannot be adjusted. The three-panel array is permanently cemented together at the factory. The manufacturing tolerance usually allows for alignment to be off by as much as 1/2 a pixel at the edges of the picture. I can't really tell from the picture if Panasonic would consider that to be in tolerance or not, but anyway since you bought the projector off ebay there's no warranty, so you'll just have to live with it. To have Panasonic replace the panel array would probably cost more than you paid for the projector.
     
  8. jmdanna

    jmdanna Auditioning

    Joined:
    Jun 11, 2013
    Messages:
    11
    Likes Received:
    0
    Real Name:
    Jacob D'Anna
    It looks like the red is one pixel off to the left. The two lines to the left of the top image are supposed to be one pixel width, but it shows up as two. I think the green and blue are combining okay, but the left panel is moved one pixel over and that results in the blue-ish green color to the right and the bright red to the left. I guess I'll deal with it, I could ask the eBay seller for a refund, but I need an LCD projector for the lens shift. My projector is not able to be placed in the center of the screen. And I have a feeling any used LCD projector i get will have some convergence issue.
     
  9. schan1269

    schan1269 HTF Expert
    HW Reviewer

    Joined:
    Jul 4, 2012
    Messages:
    17,112
    Likes Received:
    899
    Location:
    Chicago-ish/NW Indiana
    Real Name:
    Sam
    Why not buy a 2nd one to compare it. Those are $400 all day long, $500 on Ebay. I found 3(within 3 hours drive) on Craigslist for $275-$400.

    Then if the 2nd one does the same, re-sell it and you know it is a nature of the projector. If better, then ask for a refund/return from this seller.
     
  10. Mark-P

    Mark-P Producer

    Joined:
    Sep 26, 2005
    Messages:
    3,077
    Likes Received:
    937
    Location:
    Camas, WA
    Real Name:
    Mark Probst
    LCD projectors are seldom spot-on perfect with panel alignment. Mine is off a bit on the outer edges of the screen, but you can only see it if you get your face right up to the screen. If your red-panel alignment really is off by one whole pixel everywhere on the screen then that is kind of bad. Alignment is one of the drawbacks of LCD projectors. DLP projectors don't have that problem (at least not the single-panel DLPs).
     
  11. GeorgeAB

    GeorgeAB Second Unit

    Joined:
    Jan 28, 2001
    Messages:
    483
    Likes Received:
    7
    Location:
    Denver, CO
    Real Name:
    G. Alan Brown
    A few years back a manufacturer rep for Epson stated in a dealer training that at that time their standard factory tolerance allowed for pixel alignment was +/- an entire pixel. Epson makes all "3LCD" light engines used by themselves and other companies. I don't think Panasonic uses that light engine. All three-chip projector designs have the challenge of achieving tight RGB pixel alignment. Some of the newest Epson units offer digital multi-zone convergence adjustment, but due to the limitations of digital processing, can result in other image problems. Pixel misalignment produces a softer image, somewhat akin to chromatic aberration or other optics irregularities or weaknesses. As mentioned previously, single-chip DLP avoids pixel misalignment. This is one reason why I generally prefer that technology. I would not recommend trying to monkey around with the construction of your light engine. "DIY" can also mean "destroy it yourself."

    Another way to soften your image and induce additional color fringing is to use lens shift to extremes. Spherical lenses are sharpest in their centers. As you increase lens shift away from dead center, consequences to image integrity are inevitable, except in very expensive optics that typically cost more than your entire projector when new.

    Best regards and beautiful pictures,
    G. Alan Brown, President
    CinemaQuest, Inc.
    A Lion AV Consultants affilate

    "Advancing the art and science of electronic imaging"
     
  12. jmdanna

    jmdanna Auditioning

    Joined:
    Jun 11, 2013
    Messages:
    11
    Likes Received:
    0
    Real Name:
    Jacob D'Anna
    Okay something strange just happened, i think I may need to ask for a refund. I was putting in a movie to watch and when the screen was black, i noticed a couple spots show up on the screen. I put a piece of white paper up close to the projector and saw this.
    [​IMG]

    What happened? Return the projector?
     
  13. schan1269

    schan1269 HTF Expert
    HW Reviewer

    Joined:
    Jul 4, 2012
    Messages:
    17,112
    Likes Received:
    899
    Location:
    Chicago-ish/NW Indiana
    Real Name:
    Sam
    Well...

    Was this sold "as new", "as is" or "just a used projector"?

    You didn't spend much for it.

    I just checked completed listings. That projector, none of them sold in the last 90 days sold for more than $400.
     
  14. jmdanna

    jmdanna Auditioning

    Joined:
    Jun 11, 2013
    Messages:
    11
    Likes Received:
    0
    Real Name:
    Jacob D'Anna
    Used. I payed $400. Is this problem likely to get worse? I think I will have to return it.
     
  15. schan1269

    schan1269 HTF Expert
    HW Reviewer

    Joined:
    Jul 4, 2012
    Messages:
    17,112
    Likes Received:
    899
    Location:
    Chicago-ish/NW Indiana
    Real Name:
    Sam
  16. jmdanna

    jmdanna Auditioning

    Joined:
    Jun 11, 2013
    Messages:
    11
    Likes Received:
    0
    Real Name:
    Jacob D'Anna
    Well if I am buying a new one, I will definitely return the present one.
     
  17. jmdanna

    jmdanna Auditioning

    Joined:
    Jun 11, 2013
    Messages:
    11
    Likes Received:
    0
    Real Name:
    Jacob D'Anna
    The seller is exchanging mine for another "good one" he has. Crossing my fingers!
     
  18. Gregg Loewen

    Gregg Loewen Video Standards Instructor, THX Ltd.
    Insider

    Joined:
    Nov 9, 1999
    Messages:
    6,373
    Likes Received:
    32
    Location:
    New England
    Real Name:
    Gregg Loewen
    good luck.
    Lots of bugs on the older LCD stuff.
     
  19. jmdanna

    jmdanna Auditioning

    Joined:
    Jun 11, 2013
    Messages:
    11
    Likes Received:
    0
    Real Name:
    Jacob D'Anna
    What are the chances that those dots on the screen would have gotten worse? Does anyone know what those are? Pieces of dust? Burnt spots in the LCD panels? I have no idea.
     
  20. jmdanna

    jmdanna Auditioning

    Joined:
    Jun 11, 2013
    Messages:
    11
    Likes Received:
    0
    Real Name:
    Jacob D'Anna
    New projector came, got some good and bad news.

    Good first,
    1. The convergence is Much better, and movies look quite a bit sharper.
    2. The colored spots are gone. (still saw some spots on the white paper but nothing shows up on the screen)

    Now a couple bad things
    1. The left side of the screen turns a slight reddish color. (really only noticeable on a white or very bright screen)
    2. After a couple minutes on a certain test pattern, the image became slightly burned into the screen. I saw it on the home menu on my Blu-ray player. It started fading immediately but to be sure I put on the pixel flipper on the Disney WOW disc for a couple minutes and it went away completely. I don't know why it was so easy to burn in like that, but I suppose it will be fine as long as I mainly just watch movies.

    I'd rather not send this one back too. I wanna keep it, but someone reassure me. Is this thing gonna hold up? What are the chances of it getting worse?
     

Share This Page