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Toshiba 56H80 Ghosting

Discussion in 'Archived Threads 2001-2004' started by Steve Ferrante, Mar 25, 2001.

  1. Steve Ferrante

    Steve Ferrante Auditioning

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    I'm hoping someone can help me out with a problem I'm having with my 56H80. It seems to have a bad ghosting problem. This is on all inputs (Cable, VCR via s-video, DVD via component input and HDTV via component input). The ghosting is only to the left of images and more prominent with text. I'm wondering if you have seen this before and if perhaps you may have any suggestions on what I could try. Maybe something within the service menu. I noticed that with the maximum and minimum phase bars, the minimum phase bars look a little better. Could phase be a problem? My DVD Player has Y/C Correction and I have checked this using Avia. It seems to be OK.
    I have had little success with local Toshiba authorized service centers in the past and have little faith that they can help. I'm planning on having this set ISF calibrated in the near future and would like to try to have this resolved beforehand. I posted some pics with examples of this. They don't quite show how bad it is but I hope you get the idea.
    http://home.mindspring.com/~sjf99/P0000282.JPG
    http://home.mindspring.com/~sjf99/P0000305.jpg
    http://home.mindspring.com/~sjf99/P0000302.jpg
    http://home.mindspring.com/~sjf99/P0000303.jpg
    http://home.mindspring.com/~sjf99/P0000285.jpg
    Y/C correction pics:
    http://home.mindspring.com/~sjf99/minus1.jpg
    http://home.mindspring.com/~sjf99/zero.jpg
    http://home.mindspring.com/~sjf99/plus1.jpg
    Any help or direction you can provide would be greatly appreciated.
    Regards,
    Steve Ferrante
     
  2. Gregg Loewen

    Gregg Loewen Video Standards Instructor, THX Ltd.
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    Hi Steve!
    Welcome to HTF!
    Looks like your just need to do your convergence. You must do convergence in all modes, HD, full, and TW 1 2 and 3.
    From your pics it looks like it is mainly your blue gun. Also, though hard to tell from the pics, your focus may be soft. Your knoledgeable ISF tech can help with that.
    Please remember that ISF does not mean competance it only means that somebody paid $750.
    Gregg
    ------------------
    The Sonodome
    The Newest Sonotube
    Gregg's DVDs
    and LDs
    The Family Units
     
  3. Steve Ferrante

    Steve Ferrante Auditioning

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    Thanks for the reply Gregg.
    I did a mechanical and electronic focus and got all 3 colors pretty tight. Blue is as close to tight as possible. I'll check convergence again although I'm pretty sure it's ok. What do you think about phase? I believe there is a phase setting in the service menu (HPHA). Could this have anything to do with it?.
    Thanks again,
    Steve
     
  4. Steve Ferrante

    Steve Ferrante Auditioning

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    Well I can tell you that it's not a convergence issue. I took the screen off and looked into each CRT with the DTC-100's menu up. The ghosting is within the set, not the screen or convergence. It most apparent with lighter text on a darker background.
    Could it possibly be a bad input board or maybe a ground issue?
     
  5. Roger Clark

    Roger Clark Stunt Coordinator

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    Steve, I recommend you take the advice someone gave you over on the avsforum and get a service tech over to look at the set, if it's not convergence, you have something else wrong that they should take care of free.
    Roger
     
  6. Steve Ferrante

    Steve Ferrante Auditioning

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    Roger,
    I think that's the next step. I've just had some bad luck with local techs. I'm in the process of finding one that actually knows how to fix the set.
    Thanks for the help!
    Steve
     
  7. Roger Clark

    Roger Clark Stunt Coordinator

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    Keep us posted.
    Roger
     
  8. David Abrams

    David Abrams Stunt Coordinator

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    Steve,
    What you are going to want to do is call up Toshiba customer sevice in Lebanon, TN. Tell them that you have spoken with some techs and your situation. Tell them you want a tech to come out and check the DC Restoration and the Video Amplifier Bandwidth. If it cannot be fixed I would ask for another set that is in perfect working condition, I know you have had other sets replaced already but that is all I can say. Sorry I cannot be of better help.
    Thanks,
    David Abrams
    ISF Calibrationist
    Precision Theater Consultants
     
  9. Marc Carra

    Marc Carra Supporting Actor

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    Steve,
    I had the same problem with my 40H80. You can tell it's not a convergence issue, because you can actually turn off two of the three guns and the ghosting is still present in the image. It's not an SVM issue either because I physically disabled SVM. I could'nt get rid of the ghosting, and other annoying problems, so I eventually returned the set.
    Marc.
     
  10. Steve Ferrante

    Steve Ferrante Auditioning

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    David,
    Great!! I'll try to find a tech that can handle this.
    Thanks for all your help both here and elsewhere.
    Just so everyone knows, Dave is a very knowledgeable ISF tech. He really knows his stuff and when he doesn't know a particular answer, he knows where to get it. I would highly recommend him if your within his area. Once this set is working right, he will be putting the finishing touches on it.
    You Da Man, Dave
     

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