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LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby k2viper » 04 Jul 2019, 05:04

CrosShadow wrote:It's hard to get it on camera, i posted a picture but i'll try to describe it too, it looks like there's a grid when moving the camera ingame and it has the same effect on the ufo tests etc on 120 and 240p/s, it doesn't show that much in higher speeds, again switching between the 2 panels and i can definitely tell that the other panel doesn't have this issue, both have 3.08 firmware.

https://imgur.com/zo5uiMh

Ok, took for reference 2 pictures pursuiting by hand with the same settings of both screens at 120p/s of the tower, those are the results...
https://imgur.com/a/wp4QPOM Here's a better comparison about what i am talking about.

Any suggestion is welcome, i really don't want to try the luck with a 3rd screen...


Pixel inversion artifacts (grid), are afair found on many panels that are B-grade in terms of quality. It is the exact piece of panel fault, but I'm not sure whether you can RMA it for that reason. Contact your seller. Not all units have this, as you may see by yourself, but I know no real workaround to fix it - besides make it less visible via contrast/gamma tuning.
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby BrokeChemGrad » 08 Jul 2019, 18:51

I have a question for you. I got this monitor about a month ago, and it is ok. I recently came from a OMEN 25 144hz and that one wasn't too bad. My problem with this monitor and I'm not sure if it is me or the product, but it seems very hard to focus. I played CRT back in the day, and I know the motion blur reduction tech just inserts black frames every frame to trick you into a more smooth motion, but my games don't seem smooth to me. I'm running a RTX 2080 which also has its fair share of problems from what I read. Games seem a little washed out compared to my 60hz ASUS 1080p monitor next to it. I tried your custom res fix k2viper and I'm not sure if I am supposed to notice any differences or not. Is it a problem mixing my 60hz with my 240hz monitor? Any feedback is welcome.
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby Chief Blur Buster » 08 Jul 2019, 23:58

To destutter/dejitter your strobed mode and remove all those double image crosstalk:

1. Try hertzroom below to reduce strobe crosstalk. 144Hz strobed on 240Hz strobed has less crosstalk than 240Hz.
2. Try matching framerate=refreshrate using VSYNC ON. (There are low-lag equivalents of VSYNC ON, but test VSYNC ON for now until you've dejittered your strobe mode -- then start tweaking to lower latency)
3. Make sure that your refresh rate is set to the valley of your framerate range. If your game fluctuates 120fps-300fps, set your refresh rate to 120Hz for strobing.
4. Use high DPI mouse, 1600dpi+, and lower in-game sensitivity
5. Check out viewtopic.php?f=4&t=3555

You need framerate=refreshrate=stroberate for strobing to look good. Triple match.
The LG doesn't single-strobe at 60Hz, so use a higher refresh rate.

This will reproduce the CRT experience better.
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby BrokeChemGrad » 09 Jul 2019, 20:43

lower latency tweaking. like vtotals? also i do notice a little stutter in the ufo tests. any ideas how to fix that?

update: when i run the MBR test for strobe crosstalk it seems like its bouncing from one shadow to two. i guess its "acceptable". anyway i can make it better?
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby zhutwo » 30 Jul 2019, 02:59

k2viper wrote:For minimal input lag make sure you choose "Original" scaling mode under Aspect ratio settings. Default is Full wide, and it is like ~1full frame slower then Original! So if you dont absolutely have to, always choose Original mode!
There is no advertised "Dynamic action sync" option found, but in Original mode this display goes on par with best other 240hz screens with 4,5-5,0ms of total input delay


Hi, I just got this monitor and was wondering what is the difference between "Original" and "1:1" scaling mode, if you've tested it. Sorry for the revive, I'd PM but don't have the permissions to.

EDIT: Nevermind I did a bunch of testing myself and can confirm "1:1" is slower than "Original". Also it seems there's a bunch of additional input lag when running below 240hz (and not just because of the higher refresh rate). I tested against my ASUS VG248QE and the ASUS is a bit faster at 120hz and 144hz.
Last edited by zhutwo on 30 Jul 2019, 23:37, edited 2 times in total.
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby mushi » 30 Jul 2019, 12:43

Any one from USA here? LG support on Twitter said we could contact their support team: https://twitter.com/LGUSSupport/status/ ... 9115880448
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby addi » 02 Aug 2019, 20:23

mushi wrote:Any one from USA here? LG support on Twitter said we could contact their support team: https://twitter.com/LGUSSupport/status/ ... 9115880448


We are in contact with the "support team" since 5 months...

https://lgcommunity.us.com/discussion/3794/27gk750f-b
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby k2viper » 03 Aug 2019, 06:26

Chief Blur Buster wrote:To destutter/dejitter your strobed mode and remove all those double image crosstalk:

1. Try hertzroom below to reduce strobe crosstalk. 144Hz strobed on 240Hz strobed has less crosstalk than 240Hz.


Chief, for a given monitor, 240hz strobed has lowest crosstalk, it is less visible then in 144hz strobed. Even using VT 1580-1582 for a 144hz (as maximum working VT found), do not make 144hz crosstalk less visible then 240hz. In 240hz, it is simply smaller due to a higher refreshrate.
Last edited by k2viper on 03 Aug 2019, 06:39, edited 1 time in total.
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby k2viper » 03 Aug 2019, 06:28

BrokeChemGrad wrote:lower latency tweaking. like vtotals? also i do notice a little stutter in the ufo tests. any ideas how to fix that?

update: when i run the MBR test for strobe crosstalk it seems like its bouncing from one shadow to two. i guess its "acceptable". anyway i can make it better?


All optimal settings are included in first post.
Stuttering can be fixed by implying custom resolutions' VT to make its refreshrate exact 239,760Hz instead of default 239,759Hz. Many users already confirmed that such fix definitely works.
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby Squink » 14 Aug 2019, 04:25

k2viper wrote:
BrokeChemGrad wrote:lower latency tweaking. like vtotals? also i do notice a little stutter in the ufo tests. any ideas how to fix that?

update: when i run the MBR test for strobe crosstalk it seems like its bouncing from one shadow to two. i guess its "acceptable". anyway i can make it better?


All optimal settings are included in first post.
Stuttering can be fixed by implying custom resolutions' VT to make its refreshrate exact 239,760Hz instead of default 239,759Hz. Many users already confirmed that such fix definitely works.


I was considering buying this 240hz monitor for low input lag and motion blur reduction but since it seems to have so many issues what is the best 240hz monitor in your opinion? Good motion blur reduction is most important.
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