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Troubleshooting procedure for monitor color missing problem

Discussion in 'Electronic Repair' started by valutek, Jan 2, 2004.

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  1. valutek

    valutek Guest

    My old Sony (SFII 17" model) is not displaying the color correctly --
    The screen seems more redish and less blue-ish. Other things are just
    fine except this color loss problem.

    My (and others') first suspect is the problem with the video cable. I
    took the cable out from the monitor and checked the resistance for
    each pin and their terminal side. All colors pin (pin 1,2,3) have
    around 75 ohm and their return (6,7,8) are 0 value. Pin 13, 14 seems
    fine, too.

    This result puzzles me a bit and I need to confirm these results are
    actually right. I am thinking swap the color cables ( R, G, B) on the
    monitor side. How can I achive this safely and logically?

    Also what is the next step for the troubleshooting? I believed that I
    already googled some detailed monitor diagnosis steps in the web but
    could not find it any more. Could anyone point me to the right
    directions?

    Please also send a copy of reply to when
    following this post.

    Thanks

    Winston
     
  2. Marco

    Marco Guest

    Hi

    I have a similair 15" model.
    There are some power resistors on one of the PCBs. They haven't been
    mounted the way it should (don't know how to explain in English,
    sorry...) Remove the solder, apply some new, and it will probably work fine.

    You can test bij displaying a pic and with a pice of plastic pushing the
    components. If the pic changes, you found the loose contact.

    Good luck
    Marco
     
  3. mike

    mike Guest

    Check the solder joints on the CRT pins.
    Or you could come back to read the posts we thoughtfully posted
    in response to your query.
    mike


    --
    Return address is VALID.
    Bunch of stuff For Sale and Wanted at the link below.
    Toshiba & Compaq LiIon Batteries, Test Equipment
    Honda CB-125S $800 in PDX
    TEK Sampling Sweep Plugin and RM564
    Tek 2465 $800, ham radio, 30pS pulser
    Tektronix Concept Books, spot welding head...
    http://www.geocities.com/SiliconValley/Monitor/4710/
     
  4. What you are measuring are the 75 ohm termination resistors for the
    video, signal sense, and the ground return references. This is okay.

    The monitor has a fault condition in the video amp section, or the
    tube itself may be a bit weak, therefore unballanced in its
    electron-gun drive.


    Jerry Greenberg
    http://www.zoom-one.com
     
  5. Why, it sounds like what one would expect. The video lines are terminated
    in 75 ohms.
    You need to determine if the problem is a missing color or just a weak
    color, and whether it happened suddenly, or you just noticed it.
    Sorry, post here, read here. This isn't a free private consulting service.

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: The email address in this message header may no longer work. To
    contact me, please use the feedback form on the S.E.R FAQ Web sites.
     
  6. James Sweet

    James Sweet Guest

    Is it really that unreasonable to click the other button and post to the
    group as well as email him directly? I often do that if their addy isn't
    munged, that way the answer is public as well as going directly, less likely
    to get lost in the usenet jungle and wasted.
     
  7. But the original poster may miss any followups. So, if the first reply
    says to "connect the 115 VAC to your tongue", the original poster dutifully
    follows then definitely misses the followups. :)

    More personally, it bothers me that we as good citizens spend countless
    hours on these NGs helping others but someone comes along for a quick fix
    and can't be bothered to read the group at all. They can always reliably
    find the group on Googlegroups even if their ISP doesn't catch all postings.

    For the most part, there people haven't read the FAQs, haven't searched for
    past threads, haven't spent the time to do the minimal research.

    Sorry, maybe I'll mellow eventually. ;-)

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: The email address in this message header may no longer work. To
    contact me, please use the feedback form on the S.E.R FAQ Web sites.
     
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