Asus G74 screen flicker (dark backgrounds and low brightness)

[380mcn]

Hello everybody.
I have an asus g74 and it seems that the screen flickers with a dark background.
If i put the maximum brightness it won't be visible but as it goes down to the minimum the screen starts to flickers. It is a little annoying since i paid 1600eur (2200$).
I have seen other 3 with the same problem. The place where i got it told me it was the inverter. Is yours the same?:confused:

Regarding this issue i don't have any complaint so far (1week of use)

Best wishes

(i don't know the model in question but mine is the one with the i7 2870, 16gb ram, 2hd 500gb, gtx560m 3gb ddr5, no 3D, full hd)

[ny2lond]

saltsal wrote:
Hi! Having exactly same problem. Any luck with finding solution? Please let me know.
PS. Chastity no replying too

I finally managed to find a solution to the flickering. It is weird, but hey... it works.

I have downgraded my driver to 285.79 - it's faster in Metro! and it resolves the horizontal lines issue.

Open Nvidia Control Panel ->Adjust desktop size and position and select full screen.

Next, go to change resolution -> Customize -> Create Custom resolution -> Type 67 in refresh rate. Make sure Scan type is set to Progressive and hit test. If all works well, select yes.

* * * After this, there should be a Custom with you creation, above PC list. Select it, press the drop-down list and select 67 Hz with 32-bit Colour depth and hit apply.

If creating the custom resolution doesn't work (ex: it tells you it is not supported) type 132, select Interlace and hit test. Whatever happens (mine did some weird display glitches and I unplugged the laptop scared like s**t) just hit Esc.

If nothing works, just type 33 Hz, Select Progressive and hit test, it should wotk. If it does, select no and then type again 66 (probably some driver bugs).

Whatever way you manage to create that 66Hz, allways do the "* * *" part

Here is a site to test it, because of the background (It's the one that made me do all these tests): http://www.3dtotal.com/index_gallery...s#.T7z1_EUnxkw

Now... Some people here say it's a hardware-created problem. Well, this shows it is. Here is the explanation. The Brightness LED's work in a frequency multiple of somewhere around 67Hz. As the display has a 60 Hz refresh rate, that makes a 7 Hz offset, which creates the flickering. It's like in sound - the resonance effect.

A non software way (and permanent as well) is to open the display cover and search for a special diode on that circuit board you guys were talking about (inverter?!). That has a screw-like cap and by doing some tests, you could calibrate it.

EDIT** It's 67 Hz, not 66. After some thorough testing it turned out 66 is still out of range.

[380mcn]

ny2lond, your solution seems the one for people with the notorious gray/yellow/pink flickering some people have. this seems to occur specially with the new nvidia drivers. (is there anyone testing them prior to put in online?) this is not the case i'm experiencing. i trully believe it is the LED modulation controller which seems to be a nice crap. When we use less bright, the flicker appears because 'less electricity' is running through the leds.


dstrakele, i just loved your comment!! "Ah! Another variation of the "hit it with a hammer" approach. I suspect they use that technique a lot at the ASUS service centers..."

[Looking4Answers]

WOW!!!!! This actually works, thank you so much. I had given up on a fix for the problem and did not expect Asus to fix anything. Anyone having this problem, read ny2lond post and read carefully. You need to do the second part in order for it to work. I did not have to downgrade to do this, I actually just upgraded to the latest 301.42 Verde drivers and it works. Hopefully this fix will not cause other issues due to the refresh rate being 67.

Great Job ny2lond

[380mcn]

IT WORKS!

BTW, i want to add the following.


After creating the 1920x1080 67hz profile on Nvidia Control Manager, APPLY, Close
You have to right click on desktop > Screen Resolution > Advanced Settings > Monitor Tab > Screen Refresh Rate > 67hz!

ny2lond, YOU ARE A TRUTHFULLY SAVIOR ! if this was reddit, you would get an upvote!

PS. No need to downgrade drivers, looking4answers is right, it works with the latest Verde drivers!
PS. Romania Rulez!

[storm78]

Hello,

This solution indeed works. Thanks a lot man, you're a hero...
Asus did nothing except employing incompenent tech stuff and sending the laptops back unfixed. Thanks Asus, go on like this and no one will ever get an asus laptop again ... Bravo ...

PS: when this flickering first occured i remembered my old CRT monitor and how we can change the refresh rate to at least 75 hz but i thought it is not possible on lcd screens. So thank you again for letting us know that it is possible using nvidia settings customizations and explaining that 67 hz stuff.

by the way i bought another laptop which its brand is acer aspire and in here it is known that acer is no quality brand. Guess what : NO FLICKERING whatsoever and actually it is quite well built for $1000 laptop , only minus is resolution is 1366x768.
I was about to sell this asus laptop but after your solution i think i can stick with it some more time.

THANK YOU BIG TIME .

[OldNESJunkie]

Yahoo, it does indeed work. In fact I was able to set my monitor to 75hz refresh rate set to Progressive. MUCH better. I thought about trying this but never got around to it because I was under the assumption this LCD panel would only support 60hz. In Device Manager my panel says "MONITOR\LGD02D1".

[ny2lond]

380mcn wrote:
IT WORKS!

BTW, i want to add the following.


After creating the 1920x1080 67hz profile on Nvidia Control Manager, APPLY, Close
You have to right click on desktop > Screen Resolution > Advanced Settings > Monitor Tab > Screen Refresh Rate > 67hz!

ny2lond, YOU ARE A TRUTHFULLY SAVIOR ! if this was reddit, you would get an upvote!

PS. No need to downgrade drivers, looking4answers is right, it works with the latest Verde drivers!
PS. Romania Rulez!

Thanks mate! I am glad I did help you all.

P.S. The reason I downgraded the drivers is because on certain dark shades there are horizontal lines(2 px wide). That is a driver issue, as the lines do not appear in the driver I told you to downgrade to. To test it, go here (the image has no lines. if you see them, you also have the issue): http://s19.postimage.org/qtkznw0e9/testimage.png

[soh299]

Hi, was gonna try the 67Hz solution, but just wondering would it by any chance spoil the LCD?

Got pretty concerned after reading the disclaimer when i tried to customize custom resolution. 😞

[DrBeltway]

There are all kinds of situations that are next-to-impossible to predict, not to mention mistypes, mistakes and accidents.

The chance of hurting the LCD is probably extremely low, but the disclaimer is there for those rare exceptions. I don't want to spook anyone but it's possible that some component in the LCD is sensitive to refresh rates above 60Hz. It's also possible that the LCD will fail prematurely even at the standard refresh rate.

In the end, you have to weigh the risk against how much the issue (flickering) bothers you. There are several people here who have changed refresh rate to 67Hz and said it solved the flickering problem - and nobody has reported an LCD failure from it yet.

It's interesting (at least to me) that so few people seem to be sensitive to the flickering. I barely notice it myself, but I tried ny2lond's solution, changed the refresh to 67Hz, and that fixed it. (Thanks ny2lond!)

There's got to be a better way to change the backlight LEDs brightness that won't interact badly with the screen's refresh rate. Too bad our LCD mfgrs aren't using it. Mine is a Chi Mei (CMO1726).

[ny2lond]

Guys, use the latest beta drivers from geforce.com. They finally got it right with the horizontal lines I told you about. Unfortunately, you still need to do the 67 Hz tweak.

http://www.geforce.com/drivers/results/46046