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Problem with a Sony Multiscan E500

Discussion in 'Electronic Repair' started by Starflex, Mar 24, 2007.

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  1. Starflex

    Starflex Guest

    Hi to everybody!
    I have a problem with this monitor:the "black" doesn't appear black..but
    only "light black"..almost green...
    Searching in the service manual, have found that there is a rail, +80v CC
    (without particular signal wave), that in my monitor is "only" 78,6v CC.
    In the service manual there isn' t wrote the tollerance for this (ex, +-
    0,2v).. but this line @ 80V gave the power to the RGB AMP board.
    I had seen the power supply board and the line @ +80V appears ok.
    So I want to test if the problem is the lower voltage: can I put a 1,5 volts
    cell in series to the + 80v circuit?

    Of course only for a momentt, just the time to see if the problem is solved
    or not.

    What do you think about this ideas? I'm an idiot to think this? :)
     
  2. Ken

    Ken Guest

    Is this one of the monitors where you cannot darken the picture enough?
    If so, you might have the infamous Sony G2 problem that requires a
    modification so that it is reduced. You do not want to mess with the
    "Rail" that you describe. Write back with the answer to if you can
    reduce the contrast and brightness to a dark level, and I might be able
    to help you.
     
  3. Starflex

    Starflex Guest

    Hi Ken,

    Sorry, I'm italian and I have some difficulties to explain correctly the
    problem (..of course, not because "I'm Italian"...but because I don't speak
    english very well..! :) )
    First of all, if you want, you can download the service manual (PDF) from
    this site:

    www.scooterclub-nolimits.it/E500.pdf

    Now I try to describe the problem.
    I gave this monitor for free, from a friend, that don' t use it because it
    had some problems.
    The monitor was very "out of convergence", and I solved the problem only
    moving the fold poles on the tube, and finally using the regulation of the
    OSD.
    But the principal problem, now, is another: the monitor appear too bright.
    If I put the brightness at the lower valour, and the contrast at the higher
    one, the monitor is too bright.
    The red appear nearly orange, the black appear too bright...like a black
    t-shirt that you have washed many and many times (sorry for the stupid
    example).
    This is the problem.
    Moreover, at this time, I don't have an oscilloscope (sigh!) to check signal
    form...
     
  4. Starflex

    Starflex Guest

    ...uhm...I think that you are speaking about this:

    http://www.geocities.com/gregua/windas/

    Probably this is the problem...you gave me a good way to search in Google,
    speaking me about "Sony G2 problem"!
     
  5. Ken

    Ken Guest

    First off your English is fine. You might use different descriptive
    words than I would use, but I think I understand what your problem is.
    The monitor you have is NOT the same one I have. Mine is a 19" Dell
    Trinitron made by Sony and the problem sure sounds the same. Below are
    a few links that might not be exactly about your monitor, but you should
    get the idea of what the problem is if your monitor is of the same type.

    The monitor has a port that can be used to adjust the G2 voltage, but
    it requires software and an adapter be made. The details on how to do
    this are probably mentioned in the links below. The only problem is it
    is a lot of work for only one monitor. If you had many, it might be the
    way to go.

    There is however a modification that can be made to bring the monitor
    into a usable setting. On my 19" monitor my notes say to replace R459
    (10Meg) with a 4.6-6.8Meg one. (If the present value of that resistor
    is not accurate, disregard the value and resistor number I suggested.)
    There then is another (different) resistor that you must modify rather
    than the one I suggested. The links I suggested might give you the
    correct one? The resistor is of course in the rear of the monitor on a
    vertical mounted PWB above the flyback area. It is not on the main
    horizontal PWB that the flyback transformer is mounted.

    The key is you are modifying the bias for the transistor controlling
    the G2 voltage to the CRT. Once you find the current resistor, jumper
    in some different values until you get the correct brightness. Do this
    check with your brightness and contrast at the midrange setting.

    http://www.short-media.com/forum/showthread.php?t=19549&page=14
    http://www.geocities.com/gregua/windas/
    http://www.google.com/search?hl=en&q=Sony+G500&btnG=Google+Search

    If you write back I will try to answer any questions you might have or
    suggest where you might find more answers. A search on Google for "G2
    too high, Sony, Dell, Trinitron, etc." might also be productive.
     
  6. Eeyore

    Eeyore Guest

    I have an E530.

    Do you have the on screen menu ? Go to the COLOR menu - below the color
    temperature setting select *IMAGE RESTORATION* and select it !

    It worked for me. Better now than it was when delivered in fact.


    Graham
     
  7. Starflex

    Starflex Guest

    Thank you Ken!
    Moreover...your monitor (Sony/Dell 19") is the SAME monitor (I think..mine
    is Sony multiscan E400) that i'm using now.
    And I have also a question for this screen: i had some problem with the
    convergence...
    Also in your monitor is "quite impossible" to obtain a correct convergence
    in all parts of the screen?
    Using, of course, all the "fold poles" on the tube and the regluations on
    the "Menu' "..
    I don' t obtain a perfect convergence...
    uhmm.. I think that I try this way, if I found the cable, or if I can make
    it with a few money.
    Perfect, I think that you gave me the solution.
    First of all, I search a way to made the cable and use the software to
    correct the problem.
    But, if I find it too expensive, or too long (I think, too long!), I try the
    solutions of the resistors, buying some resistors and finding the correct
    value for the better image.
    Thank you a lot, Ken, you are very kind.
    Now I search, with the help of "Saint Google", all the info for using the
    digital alignment software (moreover, in ofe of the link, there is a great
    guide).
    Thank you, thank you, thank you! :)
     
  8. Eeyore

    Eeyore Guest

    Yes, Dell used a Sony chassis AIUI.

    I found myself in the same position as you about a year ago and actually bought
    another (second-hand) 21" Sony as a possible replacement on ebay. I was talking
    to the seller about picking it up and he gave me the tip about color
    restoration. It works a treat ! As a result I still haven't yet used that
    monitor but I just got a PCI video card for a second display and soon I'll have
    2 21" Sonys in front of me.

    Graham
     
  9. Starflex

    Starflex Guest

    Uhmm...in My E500 there isn't the "IMAGE RESTORATION" selection, under the
    menu..
    I had seen ALL the sub-menu....
     
  10. Ken

    Ken Guest

    I am not sure exactly where you are at with your problem right now, as
    there have been additional posts regarding it. But I would like to
    suggest you clear up the G2 problem before you adjust other items like
    convergence. At least that is what I would do before attempting them.
    If you mess with convergence and it is not needed, you could make a
    bigger headache for yourself. Just my two cents.
     
  11. Starflex

    Starflex Guest

    Just a moment: i have TWO monitors.
    The 21" one, that is "overbright", and the 19" that is out of convergence.
    The E50, 21", now is open and I'm not using it (I have orded the cable to
    use WINDAS Sony recalibration software), instead I'm using the 19" (that had
    perfet colours and correct G2 value, and is only is out of convergence).
    In this last one, 19", probably I can solve the problem with the same
    program. I had read that there is also a sub menu that can correct defect of
    gometry,etc...
     
  12. Ken

    Ken Guest

    OK, I misunderstood. I thought you had a monitor that exhibited both
    problems. From what I read you can perform just about everything with
    the software and cable, so you are probably correct in expecting the
    convergence problem to be corrected as well. Should you get a cable and
    try the software, post a new message in the news group telling us how it
    worked. I would be interested in your results. Good luck.
     
  13. Starflex

    Starflex Guest

    Perfect, Ken.
    I have buyed the cable/adaptator and d/loaded the program.
    I think that the cable need about 10 days to arrive ( sigh..), but BE SURE
    that I post a new message with the results, in the 21" and also in the 19"
    one.
    You have traced me the correct way to find the problem: thank you a lot!
     
  14. Eeyore

    Eeyore Guest

    It has an icon that's totally meaningless. Do look again. It's under the COLOR
    menu. There are only 2 options - set color temperature and color restoration on
    my E530. It works a treat too.

    Graham
     
  15. Starflex

    Starflex Guest

    Wait.
    I push the button. I go to the right and I enter into the "color " menu.
    Now I have three possiblitites: "Easy", "Expert" and "SRGB".
    In none of these there is a icon or a "color restoration" possibilities...
     
  16. Eeyore

    Eeyore Guest

    Maybe it's not on that model then.

    Have you got a service manual btw ? I found one here...
    http://www.eserviceinfo.com/download.php?fileid=18433

    I don't know how you link and open tar files though.

    Graham
     
  17. Sjouke Burry

    Sjouke Burry Guest

  18. Andy Cuffe

    Andy Cuffe Guest

    Thanks for posting that. It will be very useful. I built a cable
    several years ago for the DOS version, but it was almost impossible to
    use without the special test generators and color meter.

    Is there a way to add older models to the database? It's the older
    ones like the GDM-W900 and even GDM-20SE1 that could use the most
    adjustment these days. Most are so far off that I don't even bother
    with them any more.
    Andy Cuffe

     
  19. Andy Cuffe

    Andy Cuffe Guest

    I think it's in the option menu on some monitors. If it's too old it
    won't have it though. They added this feature around 2001, but it
    doesn't work on the 21" monitors from that year. They go through the
    motions, but I've never seen a 21" from 2001 where it made much
    difference to the picture. It works like magic on the 19" from 2001
    and the later 21" ones.
    Andy Cuffe

     
  20. Starflex

    Starflex Guest

    My E500 was manufactured on December 2000.It was dismissed about in 2004 for
    this problem (overbright) , and the old owner gave me it.
    So I have picked up it about two months ago.
    In the menu there isn' t this option, I'm sure.
    Probably, Sony introduced this feature for further model to solve this
    problem...that is very common, I see...
     
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