TFT monitor fault

P

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
 
In article <bjdjta$jsm$1@uns-a.ucl.ac.uk>, p.noga@ucl.sp.am.ac.uk
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
 
"Harry Bloomfield" <harry.m1bytNOSPAM@tiscali.co.uk> wrote in message
news:MPG.19c467c91df82db598993c@news.individual.net...
| In article <bjdjta$jsm$1@uns-a.ucl.ac.uk>, p.noga@ucl.sp.am.ac.uk
| 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
 
"Tom MacIntyre" <tom__macintyre@hotmail.com> wrote in message
news:05pklvg3fshfhtjnqhgdv2lurbfkv5eum4@4ax.com...
| On Sat, 6 Sep 2003 22:34:12 +0100, "Paul Noga"
| <p.noga@ucl.sp.am.ac.uk> wrote:
|
| >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
 
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
Click to expand...

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
baltimora@psu.edu
 
On Sun, 07 Sep 2003 19:40:12 GMT, Andy Cuffe <baltimora@psu.edu> typed:

The tubes can be replaced, but it's not something for a novice.
Click to expand...
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)

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.
Click to expand...
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
--
All viruses and spams are automatically removed by my ISP before
reaching my inbox.
 
"Andy Cuffe" <baltimora@psu.edu> wrote in message
news:3F5B8A72.597D@psu.edu...
| 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
| baltimora@psu.edu

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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