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TFT LCD - a step backward ?

Discussion in 'Electronic Repair' started by [email protected], Mar 27, 2007.

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  1. Guest

    In the past, when the big-fat monitors were still been used, if
    there's any problem with them, I can open them up and find and fix the
    problem.

    Nowadays, where the TFT LCD bunch is taking over, when a monitor fail,
    it just dies. Can't be repaired, nada, zilch.

    To me, the TFT LCD represents a step backwards. I have on my hand 5
    TFT LCD monitors that lie belly up, and I just can't fix them ! All of
    them have the same problem - the back-lighting fails, but since
    everything is compressed into a compact module, there's no way to fix
    it !

    Darn ! !
     
  2. Lionel

    Lionel Guest

    I used to fix 3-4 dead LCD backlights a week. It's fiddly, but not all
    that difficult.
     
  3. Guest

    Oh yes you can fix them. Find a replacement backlight. Taking apart
    the screen is a bit tricky (Ok sometimes a lot tricky), but it can be
    done.
     
  4. Pongo Potts

    Pongo Potts Guest

    some repairer you are, can't fix a simple backlight.
     
  5. James Sweet

    James Sweet Guest


    Well it's not as if anyone gets the CRT monitors repaired anymore
    anyway, everything is so cheap and disposable and I suspect it will
    continue that way unless disposal costs rise significantly. Also many of
    the most common faults with TFT monitors can be repaired, I usually see
    dead power supplies or bad backlight inverters or tubes.
     
  6. Lionel

    Lionel Guest

    Yep. All of which are cheap & easy to swap out. (Except for the tubes,
    which require a fairly delicate touch.)
     
  7. ©

    © Guest

    On 26 Mar 2007 21:27:15 -0700, wrote:

    |>In the past, when the big-fat monitors were still been used, if
    |>there's any problem with them, I can open them up and find and fix the
    |>problem.
    |>
    |>Nowadays, where the TFT LCD bunch is taking over, when a monitor fail,
    |>it just dies. Can't be repaired, nada, zilch.
    |>
    |>To me, the TFT LCD represents a step backwards. I have on my hand 5
    |>TFT LCD monitors that lie belly up, and I just can't fix them ! All of
    |>them have the same problem - the back-lighting fails, but since
    |>everything is compressed into a compact module, there's no way to fix
    |>it !
    |>
    |>Darn ! !

    Unless they are like the 1989++ Sharp Plasma Screens, that were all
    glued to hell, just popping out the "seems" would give you a good picture of
    the situation..brownouts...cold solder/etc.... most are very *Tweaky*

    After all the research, You only learn from your hands on
    experiments.....
     
  8. Meat Plow

    Meat Plow Guest

    I've replaced ccfls in a laptop display so I imagine it would be much
    easier on a desktop display.

    --
    #1 Offishul Ruiner of Usenet, March 2007
    #1 Usenet Asshole, March 2007
    #1 Bartlo Pset, March 13-24 2007
    Pierre Salinger Memorial Hook, Line & Sinker, June 2004
    COOSN-266-06-25794
     
  9. kony

    kony Guest


    You must not be trying very hard. What would be interesting
    is to see if there is some way to refit it with LEDs for
    illumination. Not on a "good" monitor, just some junky old
    thing as an experiment.
     
  10. Lionel

    Lionel Guest

    They generally use the same LCD modules, so the job is almost
    identical. The advantage of a desktop display is that you have a
    little bit more room to work with when you're extracting the LCD
    module in the first place.
     
  11. Jim Yanik

    Jim Yanik Guest

    You certainly don't have colorimetry,geometry alignment and convergence
    problems with LCD displays.
     
  12. Andy Cuffe

    Andy Cuffe Guest

    That's what I expected, but I'm happy to report than I've had more
    success fixing LCD monitors than I ever did with CRT monitors. The
    most common problems are simple things like bad caps and back light
    problems. The inverters can often be repaired (about half of them
    just have a blown fuse). I've never had to replace a CCF tube in a
    desk top monitor, but at least it's possible unlike when a CRT gets
    dim. Most LCD monitors are also much easier to take apart and work on
    than CRT monitors. There's no more rebuilding the deflection circuit
    only to have everything blow up again because the unobtainable flyback
    is bad. The best part is that LCDs are light weight and easy to
    handle compared to CRTs.
    Andy Cuffe

     
  13. Sofie

    Sofie Guest

    usually the inverter board is NOT "compressed into a compact module"... and
    many times can be repaired somewhat easily... backlights are not that
    hard to replace in most designs but one has to be careful, gentle and not
    "ham handed".
    Dan
    - - - - - - - - - - -
     
  14. Meat Plow

    Meat Plow Guest

    Yeh it was the room to work in that I was talking about. I replaced the
    inverter in my older Dell 15" and it was just an all around PITA.

    --
    #1 Offishul Ruiner of Usenet, March 2007
    #1 Usenet Asshole, March 2007
    #1 Bartlo Pset, March 13-24 2007
    Pierre Salinger Memorial Hook, Line & Sinker, June 2004
    COOSN-266-06-25794
     
  15. Meat Plow

    Meat Plow Guest

    err ccfls and inverter.

    --
    #1 Offishul Ruiner of Usenet, March 2007
    #1 Usenet Asshole, March 2007
    #1 Bartlo Pset, March 13-24 2007
    Pierre Salinger Memorial Hook, Line & Sinker, June 2004
    COOSN-266-06-25794
     
  16. jonpi

    jonpi Guest

    and also ... think of your eyes....

    not every electron stops at the phosphorescent layer

    you know, the electrons, from the gun(s), pointed at your head
     
  17. hi, i tel ya know , tft monitors are no where as good as crt, crt have
    better depth of color , thats why graphic designers still use em
     
  18. James Sweet

    James Sweet Guest



    It's about the same really, there's not much difference in the panels
    themselves, the desktop displays just have a control board in there as well.
     
  19. James Sweet

    James Sweet Guest

    Huh? Electrons can't travel through the air, that's why even a tiny
    amount of air leaked into a vacuum tube will cause it to stop functioning.
     
  20. Meat Plow

    Meat Plow Guest

    Must have meant xrays.
    --
    #1 Offishul Ruiner of Usenet, March 2007
    #1 Usenet Asshole, March 2007
    #1 Bartlo Pset, March 13-24 2007
    Pierre Salinger Memorial Hook, Line & Sinker, June 2004
    COOSN-266-06-25794
     
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