LCD refresh rate issue

[plummer66]

Ok....put a new pc together....(AMD 3500, 1 sata drive, 1 gig ram, PCI-e vid card) and it will boot up to windows......however when I changed the resolution settings my screen went black. Now my LCD just says something about 1280x1024 @60hz is only supported. I went into safe mode and windows VGA mode and it still doesn't seem to work. I've tried reinstalling the display drivers from the cd but still the same. Any ideas?

 

[Bozo Galora]

what was the res when you tried to change it?

in the control panel advanced display setting tabs, does the monitor show as the exact model you have, or does it say default?

in dev manager, does monitor show driver in properties tab?

 

[plummer66]

it was 800x600. Originally it just showed Default monitor....but I loaded the drivers for my Duh-ell 1907FP and it shows ok. Dev manager shows everything as fine.

 

[Tostada]

That's interesting... If you can see the machine POST, the LCD obviously supports more than just 1280x1024, right?

So are you saying you installed XP, and everything was working just fine, and XP installed using the default resolution of 800x600? Then when you went into display properties and tried to set 1280x1024 everything just went black? Now it won't come back even in safe mode?

 

[dorion]

Don't worry 60Hz refresh rate on a LCD is normal, they don't need to refresh, really just a holdover from CRTs.

*EDIT Apparently English is my second language.*

 

[plummer66]

it will come back into safe mode and windows vga mode......but that is it.
I did check the settings and a 75mhz refresh rate was selected for it. WHich I know it should only be 60 for LCD's.
I am a little stumped on this one.

 

[plummer66]

maybe i should just uninstall the video drivers and start from scratch again.

 

[So]

Originally posted by: dorion
Don't worry 60Hz refresh rate on a LCD is normal, they don't need to refresh, really just a holdover from CRTs.

*EDIT Apparently English is my second language.*

hehe.

Plummer - it's 75hz, not mhz. Some LCD's drivers show up at 75Hz. My 17" Hitachi does. That's fine.

 

[plummer66]

sorry..........i'm at work right now and not infront of my pc at home. Pardon the lack of monitor-jargon.
I've worked on tons of machines before and never had a problem like this before. I will admit that this is my first PCI-e (and Nforce4) one and only my second with an LCD.

 

[Bozo Galora]

which ATI drivers?

 

[plummer66]

no disregard my sig. I am installing NVIDIA drivers for a 6600GT PCI-e card.

 

[SparkyJJO]

One thing I found interesting was my old ComCrap laptop I had only supported 75Hz refresh, not 60 bad news for any games in winXP, the screen would go black I had to use ReForce or something to set all the refresh rates at 75Hz.

Leave it up to ComCrap to do something stupid like that

 

[Bozo Galora]

let me guess - evga problem prone vidcard?

You could also try cmos reset with AC plug out, couldnt hurt.

you can load up powerstrip and force the res and see what happens

no info given on mobo, but make sure PCIe video first enabled

some of the newest nvidia drivers are for latest cards only - you could try a "full" supported cards .inf driverset like older 77.77

you could try 3dmark 2001 benchmark and see if it runs
search in O/S partition for (XP) dxdiag.exe and double click and run it - see what dirx you have and run the tests.

 

[plummer66]

MSI K8N Neo4-F mobo
Leadtek 6600GT

I ended up gettting by the above error......however now i'm getting yellow sporatic lines all over the screen.
I think it worked on ver 77.77 and i'm now running the latest NVIDIA drivers.

I tried to run dxdiag.exe and it BSOD'd on me on running the 3D test.

I'll try resorting back to ver 77.77 and see if it works.

 

[corkyg]

Pay no attention to LCD refresh rate. It is not an issue. LCDs do not refresh. The 60 number is strictly convention - means nothing.

 

[Oyeve]

I always wondered why LCDs even have 60 or 75 refresh rates. On my dell 2007 it gives me the option of 60 0r 75 if I use analog but only 60 using DVI. My previous dell 1905 gave both in DVI or analog. I personally saw no difference on either lcd.

 

[corkyg]

Originally posted by: Oyeve
I always wondered why LCDs even have 60 or 75 refresh rates. On my dell 2007 it gives me the option of 60 0r 75 if I use analog but only 60 using DVI. My previous dell 1905 gave both in DVI or analog. I personally saw no difference on either lcd.

It really makes no difference. LCD pixels are on or off - they stare - they are not scanned. They do not refresh. They have a response time - but you have no control over that. It's built in. Just ignore that refresh rate setting.

 

[plummer66]

so.......any recommendations as to what I should do?

 

[Bozo Galora]

try a dif monitor - preferably CRT
If it still screws up - RMA card

could try a dif cable too

 

[Talcite]

isn't the refresh rate the rate at which frames are sent to the LCD? hence, the higher the refresh rate, the better? and yes I've heard the argument about how you can't see over 30fps or whatever, i just don't buy it.

 

[Suspicious-Teach8788]

Originally posted by: Talcite
isn't the refresh rate the rate at which frames are sent to the LCD? hence, the higher the refresh rate, the better? and yes I've heard the argument about how you can't see over 30fps or whatever, i just don't buy it.

Yes, but you dont need to worry about refresh rates for LCDs. This only concerns CRTs. Now stop hyping refresh rates on LCDs PLEASE.

Moreover, the 30fps argument is for movies/tv. They use motion blur. A well blurred 30fps video will be the same as a 60fps video.

For games, you need roughly 60fps at least, if not 80 - 90fps for the eye to think its completely smooth.

 

[corkyg]

Originally posted by: Talcite
isn't the refresh rate the rate at which frames are sent to the LCD? hence, the higher the refresh rate, the better? and yes I've heard the argument about how you can't see over 30fps or whatever, i just don't buy it.

No! Refresh rate is the rate at which a CRT repaints (rescans) the image on the glass tube's phosphors. In CRTs, low refresh rates cause flicker to the eye - LCDs are steady on - no flickering at all.

 

[Ken90630]

Well, I've always thought refresh rates were irrelevant with LCDs too, for the reasons you guys have mentioned, but check this out:

Awhile back I helped a friend do some work on his P4 rig (PC clone). When we hooked everything back up, his Princeton Graphics 17" LCD monitor looked terrible. I mean really terrible -- the screen was all wavy and blurry. I simply changed the default refresh rate from 60Hz to 75Hz and voila -- prob was completely fixed. It's worked perfectly since.

I had no explanation for why that had such a dramatic effect. Any ideas, anyone?

(He's running VGA analog out, BTW, not DVI, into his monitor. His vid card doesn't have DVI out.)

 

[0roo0roo]

lcd refresh is irrelevant. lcd refreshes all the pixels at once. so theres no flicker, crts scan with a beam line by line while everything fades after the beam passes so u have to redraw the screen very fast to hide this line by line redraw/fade effect. lcd at 1hz would be flicker free. but well.. u'd be limited to 1 screen change per second..1fps slide show. if u had a crt hooked up before and set windows to a higher refresh...maybe its remembernig that setting atthat res? i dunno.

as for max fps, yes refresh is max fps, but it doesn't matter since max fps of a lcd is determined by its pixel response, which is still not going to go past its refresh at this point in time thats the one part thats still technically better on a crt, but its not a real world issue for most, lcd gives enough fps to be smooth for most people. and its only getting better with newer models and faster pixel response. course pixel response stats tend to be fuzzy u gotta read detailed reviews, since they only measure black to white response times, colors/shades take longer etc. check out howstuffworks.com for some general info on how the techs work

 

[FifthElement]

I have to strongly disagree with refresh rate not being important for LCD panels. The reason for this is simple: In order to avoid image tearing, you must enable vertical sync. But if you do that, you limit yourself to the refresh rate. So, the higher your "synced" refresh, the higher your FPS.

On my ViewSonic VX922, I use 75Hz when gaming (The max I can). 60Hz synced is far to slow for my taste.

If you can game without v-sync, then the issue is irrelevant. But the tearing issue is just too distracting for me, thus in my case, the higher refresh, the better.