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CRT Repair

Discussion in 'Electronic Repair' started by surface9, May 16, 2007.

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  1. surface9

    surface9 Guest

    OK, it might not make sense, but I really want to fix this NEC
    Multisync FE21111SB - but I don't really want to ship it to NEC's
    place in Ohio and back. Maybe someone here has some experience with
    this kind of malfunction.

    It started about a year ago (the unit is now 4 years old). When I
    would first turn it on, it would flicker and for a few seconds the top
    half of the screen was focused on a bright horizontal beam in about
    the middle of the screen - the bottom half would be normal, but, after
    a few seconds of flickering like this, the screen would "pop out",
    meaning, it would fill the display area and all was fine.

    Then it started taking more than a few seoonds, but, it would
    eventually pop out and be just fine.

    Now it is stuck in the broken state - the whole top half of the
    picture is squeezed into a bright horizontal beam running from left to
    right in the center of the screen - the bottom half is normal. It is
    like the electronic beam will not sweep the top half of the display
    area, but just sweeps across a small area in the center of the screen
    - and then, it goes ahead and finishes out the sweep of the bottom
    half normally.

    Why do I want to fix it? It is still the very best picture of ANY of
    the monitors I have looked at (including LCD's, plasmas, and DLP's).
    Combined with the ATI TVWonder card, it makes the very best viewing of
    standard definition TV I have ever seen anywhere. The colors and
    shades (especially the dark grays and near blacks) are superior to
    anything else I have seen, and I am willing to pursue fixing it,
    provided it isn't going to mean a whole new picture tube or anything
    MAJOR like that.

    What does tha failure of the top half of the electronic beam sweep
    usually mean? Or are there many possible causes for this malfunction?

    Help. Anyone knowledgealbe about this?
  2. James Sweet

    James Sweet Guest

    You've got a cracked solder joint on the deflection board, usually right
    around the vertical output IC. It's a pretty quick and easy repair, the
    hardest part by far is getting the thing apart and then putting it all back
    together when you finish. If you're not experienced working on monitors you
    might want to take it to a shop, there's some safety issues, as well as it's
    not hard to break it beyond repair by bungling an otherwise simple repair.
    If you're comfortable soldering, have some common sense, and read the
    monitor section of the faq, this repair is within the
    realm of the determined and patient novice but if in doubt, let someone with
    some experience fix it.

    Also don't ever run a CRT with collapsed deflection, that bright line will
    rather quickly burn the phosphors, resulting in a permanent dark line.
  3. May even be the vertical output IC itself. They get pretty hot and
    manufacurers tend to save on cooling area. Assembling IC and
    heat sink requires some care, too. I'd check the electrolytics
    around this IC as well.

  4. surface9

    surface9 Guest

    I am having very bad luck. The place I bought it at (Fry's, in
    Dallas) suggests that it is not feasable to repair the unit - they
    want money up front and advise me that it might take several months
    before they could return it (they have to ship it to California). NEC/
    Mitsubishi is having a hard time finding out what the part, or parts,
    cost (the deflector board and/or the vertical output IC). They say
    the parts list has no entries that sound like either the "deflectyor
    board" or the "veritcal output IC", and, they can't give out prices
    even if they could identify the part.

    They say they have only two places where it could be repaired
    (Cincinnati and California), and that I have to put a bunch of money
    up front and pay shipping both ways - no guarantees. I have called
    couple of shops here locally in the DFW area but they do not return my

    This is very sad. The picture tube on this outstanding 21" CRT is
    still in tip-top shape, and it looks better than anything else I see
    these days.

    If anyone knows someone in the Dallas/Fort Worth area that knows how
    to go inside this unit and maybe even fix it, please respond. The
    folks at NEC also said that they WILL NOT sell any parts to anybody
    except those two places in Ohio and California.

    It looks like I might be out of luck. What a bumer - only 4 years and
    this really great monitor becomes a boat anchor. This is making me
    sick. I am not good with a soldering iron (all my previous projects
    got bungled up good), and I really don't trust myself to take the
    cover off.

    Sad tale.
  5. Ask some of the local TV shops. Some guys are smart enough to fault find
    with no manual.
  6. James Sweet

    James Sweet Guest

    Frys? Don't even bother with them. Isn't there an independant TV repair shop
    somewhere in your area? I know they're dropping like flies, but there must
    be one somewhere. Ok I just did a search on and it came back
    with 58 places in the Dallas area, several of those have to be capable of
    working on CRT displays.

    The vertical output IC normally costs about 8 bucks and they're usually
    generic parts available anywhere that sells this stuff, usually just
    touching up the solder is all it requires, the repair should be under $100
    to have professionally done.
  7. James Sweet

    James Sweet Guest

    Some guys? Any tech worth going to will do the majority of repairs without
    wasting the time looking for the manual. The more of these you work on, the
    more they all start to look the same inside.
  8. Guest

    It seems you've lost your way on this. Ignore the above shops and go
    to someone competent & willing to repair it. If youve only spoken to 2
    shops, try the rest. As has been said, its probably a simple job.

    More likely to get a good response in person than by phone, and I
    would certainly suggest avoiding a lot of bs, just describe the fault,
    offer them x if they can repair it, nothing if they dont, and leave it
    at that.

    Re parts, policies vary, but some shops use parts from scrap
    equipment, so supposedly unobtainable parts are often no such thing.

    This sort of silliness is precisely why I recommend avoiding
    authorised service agents outside of guarantee periods.

  9. : It looks like I might be out of luck. What a bumer - only 4 years and
    : this really great monitor becomes a boat anchor. This is making me
    : sick. I am not good with a soldering iron (all my previous projects
    : got bungled up good), and I really don't trust myself to take the
    : cover off.

    : Sad tale.

    Not really, monitors like that are just obsolete.

    I really don't understand why you want to bother getting it fixed, not at
    all. It took like 15 seconds on to find this...

    and there are other 21's on there for $25 also.

    Don't get me wrong, I still use a Mits 21 (Diamond Plus 200) myself but if
    this thing shits out, I'm not even going to bother taking a screwdriver to

    People are dumping those things all over, for $100 which is probably what
    shipping and the estimate will run you, you can pick up 4 or 5 of them and
    weed out the best.

  10. Jerry G.

    Jerry G. Guest

    Many of the manufactures are no longer supporting any type of CRT
    monitors. Keeping inventory of the parts, and spending the time to
    troubleshoot and service them is expensive by today's standards. Some
    of these service centers no longer have any way to properly support
    CRT type monitors and TV sets.

    Considering what you have to go through, I would suggest taking the
    monitor to a local TV service shop. They will most likely be able to
    service it if the problem is streight forward, and if the parts
    required are generic types.

    As for myself, my preference is a good LCD monitor. They do not give
    off any kind of radiation, have no pin distortions, and have no
    convergence or purity errors. They take a lot less space in the
    working area, consume much less electricity, and have zero flicker
    which causes eyesore.

    Jerry G.
  11. surface9

    surface9 Guest

    Well these posts are encouraging. I'm going to look around here
    locally for someone that knows about TV's and see where I can take it
    and maybe get the soldering done. That would be ideal. NEC finally
    got back with me and suggested, just as James Sweet said above, that
    it would probably be a short soldering job. I am now thinking that I
    will get this fixed sooner or later.

    But, I had never heard of craigslist. That is a wonderful website. I
    am stunned to find good 21" crt monitors there for $25 - what a world
    we live in - these things were around $600 a mere 4 years ago - wow!.
    They still look better than LCD's for subtle contrasts. I also have a
    21.3" Viewsonic LCD which is a great monitor, but, standard TV and
    photographs look noticebly better on the CRT.

    Thanks to all.
  12. Is there a local freecycle group? People
    give away working monitors around here. I've given away several,
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
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