FP350 (Acer) LCD TFT monitor washed out.

J

Jason D.

Guest
Graphics is all there and no defects in LCD when you would view LCD
from bottom "looking up" at it at angle. Straight on, is looks like a
monitor with G2 set too high. The fluorscent lamps is fine and are
lit.

The contrast do nothing, brightness dims and brightens the lamps as it
should be. And will sync to anything and will display, menu works.

What is causing this? I don't mind fixing this when explained what is
it should be, I have access to scope and tools bec I also repair on
LCD & CRT monitors also TVs. Info on LCDs not as deep in training and
theory of LCD operation are lacking.

Cheers,

Wizard
 
"Jason D." <jpero@sympatico.ca> wrote in message
news:3f72517f.11078470@news1.on.sympatico.ca...
Graphics is all there and no defects in LCD when you would view LCD
from bottom "looking up" at it at angle. Straight on, is looks like a
monitor with G2 set too high. The fluorscent lamps is fine and are
lit.

The contrast do nothing, brightness dims and brightens the lamps as it
should be. And will sync to anything and will display, menu works.

What is causing this? I don't mind fixing this when explained what is
it should be, I have access to scope and tools bec I also repair on
LCD & CRT monitors also TVs. Info on LCDs not as deep in training and
theory of LCD operation are lacking.
Click to expand...
The contrast? control on a LCD ajusts the vertical viewing angle, by
adjusting
the amount of "twist" put on the pixels (think a lot of tiny
shutters)...perhaps a voltage is missing?
Usually, the brightness control does this, the backlights do not change
brightness...

Viper


Cheers,

Wizard
Click to expand...
 
On a TFT display there is no contrast adjustment (even though there
may be a control for it) and the brightness control brightens the
backlight as he described.



On Thu, 25 Sep 2003 00:57:56 -0700, "Vector Viper"
<ahowald@w-link.net> wrote:

"Jason D." <jpero@sympatico.ca> wrote in message
news:3f72517f.11078470@news1.on.sympatico.ca...
Graphics is all there and no defects in LCD when you would view LCD
from bottom "looking up" at it at angle. Straight on, is looks like a
monitor with G2 set too high. The fluorscent lamps is fine and are
lit.

The contrast do nothing, brightness dims and brightens the lamps as it
should be. And will sync to anything and will display, menu works.

What is causing this? I don't mind fixing this when explained what is
it should be, I have access to scope and tools bec I also repair on
LCD & CRT monitors also TVs. Info on LCDs not as deep in training and
theory of LCD operation are lacking.

The contrast? control on a LCD ajusts the vertical viewing angle, by
adjusting
the amount of "twist" put on the pixels (think a lot of tiny
shutters)...perhaps a voltage is missing?
Usually, the brightness control does this, the backlights do not change
brightness...

Viper



Cheers,

Wizard
Click to expand...
 
On Thu, 25 Sep 2003 12:54:52 GMT, Cher <ccher@your.place> wrote:

On a TFT display there is no contrast adjustment (even though there
may be a control for it) and the brightness control brightens the
backlight as he described.
Click to expand...
Exactly. This model does have both. Contrast and Brightness.
I know what liquid crystal works but, detailed info is lacking.
Especially "contrast" how is this done for LCD? This is the question.

Look at any LCD diaplays with contrast cranked all the way, you can
barely make image out straight on, improves slightly if looked off
angles.

Cheers,

Wizard

Left here for the detail.

Graphics is all there and no defects in LCD when you would view LCD
from bottom "looking up" at it at angle. Straight on, is looks like a
monitor with G2 set too high. The fluorscent lamps is fine and are
lit.

The contrast do nothing, brightness dims and brightens the lamps as it
should be. And will sync to anything and will display, menu works.

What is causing this? I don't mind fixing this when explained what is
it should be, I have access to scope and tools bec I also repair on
LCD & CRT monitors also TVs. Info on LCDs not as deep in training and
theory of LCD operation are lacking.
Click to expand...
 
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