GeForce 4 Ti 4200 1

[GeekEinstein]

I have a BFG Technologies Asylum nVidia GeForce Ti 4200, and I have a dual monitor display with one LCD (first display) and one CRT (second display). Yesterday, the LCD went out and it started displaying gray bars. Then the bars disappeared and it displayed all white. Being a tech myself, I naturally swapped the monitors to the other ports, but neither of the monitors worked. When I swapped them back, only the CRT would work, but only after I logged in blindly, and only then it was a second display. When I unplugged the LCD, everything reset to one display, and I was able to work on my CRT, and that is where I am typing now. Does anyone have any suggestions?

 

[dakota81]

Well, what are you asking? Is the LCD monitor dead or not?

 

[SYAR2003]

I also have a LCD ( a Viewsonic vx-800)
If it gets a refresh rate from the video card
thats over 60hz at 1280 or over 75hz at 1024
it does the same .It totally freaks out.
Has to unplug the power cord in the back of the panel.
Make sure your video card is sending the right
refresh rate to the LCD monitor.

 

[cdogg]

Correct me if I'm wrong (and I'm sure you will SYAR), but LCD screens don't use refresh rates. A refresh rate measures the speed of which an electron beam can project an image.

LCD screens don't have an electron beam, but instead use something called "pixel triads". Each pixel on an LCD screen is made up of three subpixels (red, blue, and green). "Response time" is the phrase used with LCD screens which measures how fast each pixel triad can turn itself on and off. You typically see measurements like 25 or 30 ms in decent LCD's.

That's one reason why they are easier on the eyes. I'm not sure how the refresh rate setting on a video card affects an LCD screen, but in theory it shouldn't.


~cdogg
[tab]"The secret to creativity is knowing how to hide your sources"
[tab][tab]- A. Einstein

 

[SYAR2003]

Right about that cdogg .

But if i set the properties on the
display adatpter to 75hz and 1280 monitor goes bananas .
So it's sampling rate is lightly getting screwed up .

A refresh rate on an LCD is like setting the speed the video data is sent to the monitor.
The input signal is sampled by the monitor
(standard sampling rate = 60 Hz X 1024 lines X 1280 Pixels + some overhead)
so having to high refresh rates in the driver you might get image problems.

I've also heard that altering the frequency/refresh in monitor driver does something with voltage to the LCD also, but i've haven't got this confirmed.

 

[cdogg]

So basically what you're saying is that if you keep the screen resolution the same but change the refresh rate from 60Hz to 75Hz, you have problems?

The resolution shouldn't matter as long as it's staying constant. All LCD's have a fixed resolution, so if you're trying to change that as well, then that could be part of your problem.

 

[SYAR2003]

Here's an update:


The refresh rate is calculted together with the resolution to set the speed for the TMDS panel link.

17-inch flat panel monitor like mine with an
resolution 1,280 x 1,024 pixels @60 .
Required bandwidth for the panel link is 3.4 Gbps.
(This is the max)

So running a to higher refresh with the same resolution makes the Silicon Image transmitter (video board)to calculate a higher throughput link witch the receiver in the panel don't handle.

Atleast thats what i think happens.