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TFT monitor fault

Discussion in 'Electronic Repair' started by Paul Noga, Sep 6, 2003.

  1. Paul Noga

    Paul Noga Guest

    Not quite sure whether this would be an appropriate group to post this,
    please feel free to offer anything more suitable if you know of any groups.

    I have a Compaq TFT500 monitor which has a screen fault in that the display
    seems to have a dull greenish tint to it when compared to a known working
    display on a laptop. I was told this was just an optical illusion and was
    initially diagnosed as a worn out tube but I think this is incorrect as the
    on screen display text is crisp and pure white as it should be.

    Can anyone offer any suggestions as to what might be the problem and what a
    suitable fix would be?

    TIA
    Paul
     
  2. | Not quite sure whether this would be an appropriate group to post this,
    | please feel free to offer anything more suitable if you know of any groups.
    |
    | I have a Compaq TFT500 monitor which has a screen fault in that the display
    | seems to have a dull greenish tint to it when compared to a known working
    | display on a laptop. I was told this was just an optical illusion and was
    | initially diagnosed as a worn out tube but I think this is incorrect as the
    | on screen display text is crisp and pure white as it should be.
    |
    | Can anyone offer any suggestions as to what might be the problem and what a
    | suitable fix would be?
    |
    |

    I don't know that particular model, but try whatever method
    (combination of buttons) is used to reset the monitor back to its
    factory defaults.

    --
    Regards,
    Harry (M1BYT)...

    Remove the 'NOSPAM' in my email address to reply.

    Free Amateur Radio Courses:-
    http://www.ukradioamateur.org
     
  3. Paul Noga

    Paul Noga Guest

    | In article <bjdjta$jsm$>,
    | says...
    | | Not quite sure whether this would be an appropriate group to post this,
    | | please feel free to offer anything more suitable if you know of any
    groups.
    | |
    | | I have a Compaq TFT500 monitor which has a screen fault in that the
    display
    | | seems to have a dull greenish tint to it when compared to a known
    working
    | | display on a laptop. I was told this was just an optical illusion and
    was
    | | initially diagnosed as a worn out tube but I think this is incorrect as
    the
    | | on screen display text is crisp and pure white as it should be.
    | |
    | | Can anyone offer any suggestions as to what might be the problem and
    what a
    | | suitable fix would be?
    | |
    | |
    |
    | I don't know that particular model, but try whatever method
    | (combination of buttons) is used to reset the monitor back to its
    | factory defaults.
    |
    | --
    | Regards,
    | Harry (M1BYT)...
    |
    | Remove the 'NOSPAM' in my email address to reply.
    |
    | Free Amateur Radio Courses:-
    | http://www.ukradioamateur.org

    Hi Harry,

    There's an option under the OSD to reset the monitor back to its defaults
    and I've already tried it I'm afraid. It didn't seem to have any effect...

    Thanks,
    Paul
     
  4. Paul Noga

    Paul Noga Guest

    | On Sat, 6 Sep 2003 22:34:12 +0100, "Paul Noga"
    |
    | >Not quite sure whether this would be an appropriate group to post this,
    | >please feel free to offer anything more suitable if you know of any
    groups.
    | >
    | >I have a Compaq TFT500 monitor which has a screen fault in that the
    display
    | >seems to have a dull greenish tint to it when compared to a known working
    | >display on a laptop. I was told this was just an optical illusion and was
    | >initially diagnosed as a worn out tube but I think this is incorrect as
    the
    | >on screen display text is crisp and pure white as it should be.
    | >
    | >Can anyone offer any suggestions as to what might be the problem and what
    a
    | >suitable fix would be?
    | >
    | >TIA
    | >Paul
    | >
    |
    | I am not familiar with that model either, but...have you tried a web
    | search to see what Anatek and other repair sites might have? It sounds
    | like the pre-drive for the regular video is different from the OSD, as
    | the OSD is generated within the monitor, and the RGB comes from
    | outside.
    |
    | Tom

    Hi Tom,

    I realise some people might not be familiar with the particular model but I
    was looking perhaps at a more generic answer for tft displays as to what
    might cause this problem. Unfortunately Anatek is US based, and I'm based in
    the UK which from my searches is pretty scarce on tft repair centres
    nationwide.

    Thanks,
    Paul
     
  5. Andy Cuffe

    Andy Cuffe Guest


    The look of LCD can vary a lot from one model to the next. This is a
    fairly old model for an LCD monitor, so it may just not look as good as
    a modern LCD. If it's dim, then the back light tube could be failing.
    If it was used 8 hours a day, or 24/7 for the last 5 years it's probably
    past its rated life. The tubes can be replaced, but it's not something
    for a novice. Finally, check for a color temp adjustment in the menu.
    If it's set to 6500K it will look very greenish and dull compared to the
    more common 9800K used on computer monitors.
     
  6. Impmon

    Impmon Guest

    I'll go with this one. I have a Radius RAD-5 display that had been in
    use for about 8 hours a day for 2 years. (about 5,840 hours total) and
    the bottom bulb went out, leaving the monitor very dim even at max
    brightness setting. I must have spent close to an hour removing oh
    about 200 screws just to remove the backlight bulb and I still haven't
    replaced it because no one carries a 320mm x 3m bulb. (there are
    several 360 and 300mm but one's too long and other's almost an inch too
    short)
    I thought 6500K would look rather red and not green?

    For the OP: another possibility is the green drive or bias is out of
    adjustment. If you can get the back cover off you should be able to see
    the main board where the video cable connects. On some LCD I've seen
    has 3 variable resistor labeled R/G/B. (some other are digitally
    controller and needs special equipment to reprogram) Try that but don't
    touch any metal part on the board. The inverter for the CCFT can be
    easily in the 500v range
     
  7. Paul Noga

    Paul Noga Guest

    | Paul Noga wrote:
    | >
    | >
    | > Hi Tom,
    | >
    | > I realise some people might not be familiar with the particular model
    but I
    | > was looking perhaps at a more generic answer for tft displays as to what
    | > might cause this problem. Unfortunately Anatek is US based, and I'm
    based in
    | > the UK which from my searches is pretty scarce on tft repair centres
    | > nationwide.
    | >
    | > Thanks,
    | > Paul
    |
    |
    | The look of LCD can vary a lot from one model to the next. This is a
    | fairly old model for an LCD monitor, so it may just not look as good as
    | a modern LCD. If it's dim, then the back light tube could be failing.
    | If it was used 8 hours a day, or 24/7 for the last 5 years it's probably
    | past its rated life. The tubes can be replaced, but it's not something
    | for a novice. Finally, check for a color temp adjustment in the menu.
    | If it's set to 6500K it will look very greenish and dull compared to the
    | more common 9800K used on computer monitors.
    | --
    | Andy Cuffe
    |

    I've checked the colour temps and tried both the settings available, as you
    mention above, and I've had a play around with the custom settings but it
    doesn't seem to have any effect. I still pose the question however, as to
    what's causing everything in the OSD colour-wise to be perfect, and yet the
    rest of the screen to be crap? I don't want to send this thing in to a
    repair shop here to pay a couple of hundred pounds to fix it when it's not
    actually the tube at all.

    Paul
     
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