TFT LCD - a step backward ?

[Jim Yanik]

Huh? Electrons can't travel through the air,

At typical TV set accelerating voltages,they aren't going to penetrate the
faceplate,either.

that's why even a tiny
amount of air leaked into a vacuum tube will cause it to stop
functioning.

He's been sitting too close to the TV set again.

 

[David Brodbeck]

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.

The lifespan of the tubes in CRT monitors has gotten so short, too. A
few years ago, I used to work at a place where we still ran Windows NT.
NT has no concept of power saving modes so the monitors generally were
just run 24/7. They'd last about two or three years before the contrast
got too bad to use them anymore. Some factory in China has figured out
how to make a filament that will cook off all its high-energy electrons
during the warranty period.

 

[David Brodbeck]

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

Heh heh...each monitor is your own little particle accelerator. The
ones with the little hole burned in the middle of the screen drive home
the point the best, I think.

 

[[email protected]]

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
- - - - - - - - - - -

Reading your reply and those from several others here really give me a
glimpse of hope. Perhaps I'm just to dim, all the LCD that die here
have the same problem - Backlights gone kaput !

When I try to replace the backlights, I found that they are glued
tightly with the whatever (tftlcd and lightguards) and how can I
replace anything if they are glued up like that.

That said, I'm still interesting in knowing how to actually replacing
the backlights. If there's any sites that have these kinds of
intructions, I'd very much like to know about it.

Thanks to you and to all !

Happy Easter !

 

[[email protected]]

an easy fix IME

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

Colorimetry issues are severe with lcds. Move your head to the side a
bit and the colour goes way off on mine - theyre old - the advantage
is theyre unfixable, so no need to waste any time.

CRTs win on almost all points technically, except for resolution, the
slimness and light weight of tfts is about the only advantage.


NT

 

[mhaase-at-springmind.com]

Reading your reply and those from several others here really give me a
glimpse of hope. Perhaps I'm just to dim, all the LCD that die here
have the same problem - Backlights gone kaput !

When I try to replace the backlights, I found that they are glued
tightly with the whatever (tftlcd and lightguards) and how can I
replace anything if they are glued up like that.

That said, I'm still interesting in knowing how to actually replacing
the backlights. If there's any sites that have these kinds of
intructions, I'd very much like to know about it.

What I think he's saying is that the odds are pretty good it's NOT the
backlight itself that's gone out -- more likely the Inverter.

The inverter is usually a small circuit board, a little smaller than a
SIMM, that is usually (in my experience) at the bottom of the LCD.
They usually connect with a couple of "push-on connectors", and are
pretty easy to replace.

If you can't find a part number on the inverter board itself, do a
google search on the montior make and model and the word "inverter".
I've found a couple on Ebay for pretty cheap..

M

 

[David Brodbeck]

CRTs win on almost all points technically, except for resolution, the
slimness and light weight of tfts is about the only advantage.

Also low power consumption, low heat generation, and immunity to
magnetic fields. You can put two LCDs next to each other without them
making each others' pictures wobble and squirm.

 

[James Sweet]

Also low power consumption, low heat generation, and immunity to
magnetic fields. You can put two LCDs next to each other without them
making each others' pictures wobble and squirm.

And some of the new ones really have excellent pictures, viewing angle
has improved tremendously too. I still say a *good* CRT wins for me, but
I'm a demanding user and often use different resolutions, something a
flat panel is not good at, but for the average user a good LCD with DVI
input will be better hands down. Geometry and convergence are dead on,
zero flicker, perfectly flat, square, light, thin, it's no mystery why
they're so popular.

 

[Jim Yanik]

[email protected] wrote in

Colorimetry issues are severe with lcds. Move your head to the side a
bit and the colour goes way off on mine - theyre old - the advantage
is theyre unfixable, so no need to waste any time.

But you don't have colorimetry/convergence/geometry FAILURES as you do with
CRTs.There are no color adjustments on the LCD display itself.