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Asus MG248Q scanlines/flicker?

post #1 of 34
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Hello Overclock forums. This is my first post.
I just bought new pc with screen (build my self)
I7 4790K
16gb ddr3 2400
ssd 850 240gb
asus strix oc rx480 8gb
asus MG248Q monitor

I have noticed some strange lines that go from down to op across the whole screen, they are not that prononced but very notisable when you know they are there. Here comes my findings. When disableing Freesync on monitor the montor reboots and lines gone. When freesync on and i reboot monitor the lines go away, but come back after 10-30 minutes. freesync off/on in crimson does nothing for this problem. When going to 120hz the lines disapear. Its like lines thats lighter then the color on display going horizontal from and they go from down to up it looks like. they are at the whole width of the screen. It seems to be a freesync 144hz problem. but i bought this system to be able to use freesync and 144hz in games. I have uploaded a video and picture please watch it . What should i do ? RMA my monitor ? will a new one be better or should i get another model ? i believe the problem is with the monitor not the computer /gfx , as reboot monitor causes the problem to disappear.
Thanks in advance!

Youtube link for video of the problem = https://youtu.be/oLD_3M4h98I

Esben from denmark. IMG_20160925_135613637_HDR.jpg 4288k .jpg file
post #2 of 34

Yeah, have something similar with the ASUS PG248Q and even the AOC G2460PG. It gets worse from 144Hz and higher. At 120Hz, it's fine, but these are 120Hz panels (natively). The 144Hz is actually an overclock.

 

So, it's the panel and unfortunately, this is normal for this exact panel.

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post #3 of 34
Thread Starter 
So there is nothing i can do about it ? Except for change for another montor? Which would you choose. I need freesync 144hz, low ms , 24 inch. Should i keep it and run it at 120hz , or should i get something else? All advise and informations are appriciated.
Thank you for your reply.
post #4 of 34

To be honest, I would keep it at 120Hz if it bothers you enough because right now, finding a good 1080p gaming monitor to match or beat the ASUS MG248Q could prove to be quite frustrating. You could end up playing the Panel Lottery for several weeks or months before you get one that doesn't have some sort of problem. I've been at this since the beginning of August and I'm still looking for a 24" 1080p high refresh rate low response time G-SYNC monitor that doesn't have some sort of stupid problem, whether it's a defect or just the way the panel is. It's extremely frustrating. I'm on my 3rd monitor!

 

I had the Acer XB241H, but that one had extremely bad backlight uniformity: when looking at a very dark game scene, it became apparent that the entire bottom-half had a "clouding" thing happening.  It wasn't gamma shift either. The XB241H also had a very annoying design characteristic: the OSD indicator that says which signal type I'm using was big and located right in the center of the screen, and it would come up every single time I started Windows, logged out and logged back in, restarted Windows, and every time I'd change the refresh rate or the resolution or if the refresh rate or resolution were changed automatically by a video game being launched. So, sometimes Alt+Tabbing out and back in a game would cause it to come up. That alone was worth returning the monitor.

 

Then I tried the ASUS PG248Q, except it has the problem that you're describing. Other than that, it's a great monitor.

 

Now I'm trying the AOC G2460PG, but it has the same problem. Sigh. lol To add insult to injury, it's the only thing I don't like about the G2460PG. If it didn't have this problem, then I'd be cheerfully yelling "it's a keeper!!!" I'm afraid to return it though because I don't know what other monitor to try. So I don't know what to do.

 

I don't know if you'd experience the same thing with Freesync monitors, but my experience so far has shown me that finding a good 24" 1080p gaming monitor can be quite difficult.

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post #5 of 34
Thread Starter 
Thank you for that great reply. I have also looked at the AOC G2460PF , but it is the same as the AOC G2460PG just with freesync instead of gsync (im using amd graphics card with freesync and need that type of monitor) , i also believe that the ASUS MG248Q which i have is the same as the PG248Q that you have , again just with gsync instead of freesync. It seems that there are no other options. It is a shame, cause i like the montior alot , i actually find the viewing angles good, colours good, and design and so on are spot on. It is wierd, today i have not seen the problem , even tough i run 144hz@freesync active. I was just thinking if there were any other monitors i could choose from, but there are not many. i have the following criteries. 24 inch, fullhd/2k , 144hz, 1ms, amd freesync/vesa adaptive sync. and hopefully an affordable price. i paid 362 USD for the MG248Q. Prices are not that cheap here in the north. The aoc however is cheaper its only 295usd..
post #6 of 34

The AOC should have the same panel, but with just a few less features or options in the OSD.

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post #7 of 34
I've tried two XL2430s and a 24GM77. All had the horizontal "scanlines" issue at 120hz and more pronounced at 144hz. Every second row of pixels was slightly brighter. Most pronounced at the left side of the screen. On the LG, it was the worst -- entire left side of the screen was covered with them and they extended up to the middle. Most visible on grey and pastel colors. Not visible on black.

On the BenQs, they would move upwards, causing a sort of flickering sensation. They did the same on the LG unless "DAS" mode was on which would just make them stand still. Sounds like it's less annoying that way, but not really. BenQ's equivalent "Instant Mode" did nothing to change their behavior though.

It seems like it's impossible to find a 1080p 144hz TN without this issue. I think the newer batches seem to be faulty because if this were always the case, you'd hear about it more often. Also, I would expect this issue to be sorted out on the new panels like the MG248, but clearly that's not the case.

I've been slaving away for two months trying to find a monitor without this issue. I've returned the 24GM77 yesterday, now it's going through the warranty process and I'm waiting for a replacement. There will be hell to pay if they pretend not to notice this issue - or worse yet, if they try to convince me it's not a big deal. The coating on these monitors is so harsh that they look dirty out of the box and with scanlines thrown into the mix, the visibility is even worse. After two months of dealing with this and hauling boxes all over town, I feel lobotomized and I just want this over with.

It's going to be very hard to find a good one. Even if you score one without this issue, you could run into other deal breakers like horrid uniformity and backlight bleeding, dead pixels, overly pronounced pixel inversion, dead rodents stuck in the chassis, anthrax, curses that will wipe out your entire bloodline and other wonderful surprises. However, you should absolutely not put up with this crap. Either keep returning until you get a good one or ask for your money back, but definitely don't send a signal to manufacturers that this is acceptable for a product that passes QA.

And don't for a moment think along the lines of "well, these are cheap monitors, I got what I paid for". Nah. The M24HW01V8 was considered premium stuff for quite a while and suddenly we're supposed to consider it a cheap product? There's no reason to believe your M240Q007 should be any worse either - hell, it's a new panel. And really, if this kind of thinking made any sense, the expensive gaming 1440p IPS panels wouldn't suffer the same horrid QA these "cheap" monitors do.
Edited by Erecshyrinol - 9/29/16 at 7:52am
post #8 of 34
The "moving scanlines" thing is bizarre. That was never reported back when the Asus VG248QE was popular (the STATIC, not moving scanlines , were reported, usually in lightboost mode, and if you were unlucky, at 144hz and faintly at 120hz), and the only time this was reported on Benq monitors, was when the wrong vertical total (VT) was being used on Z series monitors for blur reduction. Changing the VT value would stop the scanlines from moving, but wouldn't remove them from the screen.

You're saying on your XL2430T, (and on the LG), the scanlines moved without a VT tweak even active?

I can't even disable instant mode on the XL2720Z at 144hz. The screen starts lagging EXTREMELY bad like it was being overclocked too far.
I can at 120hz (WITHOUT a VT tweak). There are no scanlines at 120hz without a VT tweak, and so faint they may as well be invisible at 144hz.
*edit* I don't see any scanlines at 144hz.
Edited by Falkentyne - 9/29/16 at 10:59am
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post #9 of 34
Quote:
Originally Posted by Erecshyrinol View Post

I've tried two XL2430s and a 24GM77. All had the horizontal "scanlines" issue at 120hz and more pronounced at 144hz. Every second row of pixels was slightly brighter. Most pronounced at the left side of the screen. On the LG, it was the worst -- entire left side of the screen was covered with them and they extended up to the middle. Most visible on grey and pastel colors. Not visible on black.

On the BenQs, they would move upwards, causing a sort of flickering sensation. They did the same on the LG unless "DAS" mode was on which would just make them stand still. Sounds like it's less annoying that way, but not really. BenQ's equivalent "Instant Mode" did nothing to change their behavior though.

It seems like it's impossible to find a 1080p 144hz TN without this issue. I think the newer batches seem to be faulty because if this were always the case, you'd hear about it more often. Also, I would expect this issue to be sorted out on the new panels like the MG248, but clearly that's not the case.

I've been slaving away for two months trying to find a monitor without this issue. I've returned the 24GM77 yesterday, now it's going through the warranty process and I'm waiting for a replacement. There will be hell to pay if they pretend not to notice this issue - or worse yet, if they try to convince me it's not a big deal. The coating on these monitors is so harsh that they look dirty out of the box and with scanlines thrown into the mix, the visibility is even worse. After two months of dealing with this and hauling boxes all over town, I feel lobotomized and I just want this over with.

It's going to be very hard to find a good one. Even if you score one without this issue, you could run into other deal breakers like horrid uniformity and backlight bleeding, dead pixels, overly pronounced pixel inversion, dead rodents stuck in the chassis, anthrax, curses that will wipe out your entire bloodline and other wonderful surprises. However, you should absolutely not put up with this crap. Either keep returning until you get a good one or ask for your money back, but definitely don't send a signal to manufacturers that this is acceptable for a product that passes QA.

And don't for a moment think along the lines of "well, these are cheap monitors, I got what I paid for". Nah. The M24HW01V8 was considered premium stuff for quite a while and suddenly we're supposed to consider it a cheap product? There's no reason to believe your M240Q007 should be any worse either - hell, it's a new panel. And really, if this kind of thinking made any sense, the expensive gaming 1440p IPS panels wouldn't suffer the same horrid QA these "cheap" monitors do.

 

Yep! You and I are going through the same thing.

 

I started out with an Acer XB241H purchased from B&H last month at around August 9th. It didn't have any scanlines or any other problems like that, but instead it had horrible backlight clouding on the bottom-half of the panel. It was so bad that I couldn't even play certain games that often put me in dark spaces like Descent 2 without being extremely irritated with that distraction. Once I noticed it, it was impossible to unsee.

 

So, I returned it as "defective" and I got my full refund and B&H even paid for the return shipping! I think that was an older panel because I would imagine most people just get their monitors from Amazon.com or Newegg.

 

Anyway, so I replaced it with an ASUS PG248Q directly from Best Buy because I wasn't going to screw around with return shipping again. Well, to me it's obvious I had the newer panel because it had those damn scanlines and the grid-like pattern that was visible on top of it, especially in darker rooms in games. At 120Hz, the panel was perfect. This monitor has another problem though that made it impossible for me to live with: anytime the resolution or the refresh rate gets changed - whether I do it or whether a game does it, there's a chance for the monitor to lose its signal and this locks the entire computer up. I figured that out when I couldn't blindly shut down or restart. So, I returned that piece of crap. Yep, I'm calling the ASUS ROG Swift PG248Q a piece of crap. I wouldn't take that monitor, even if it were free. Why? Because I'd never use it.

 

Returning the monitor to Best Best buy was amusing. The guy working at the Customer Service desk was obviously a PC gamer in his very early 20s. As soon as he saw what I was holding, he looked at me and in a very friendly tone was like, "You're returning the ASUS PG248Q?!?!?!" lol Yep! It's garbage, man. Let me explain it to you! hahahaha Of course, he didn't understand and thought that maybe it was either PEBKAC or maybe my computer. lol Sigh.

 

Currently, I am using the AOC G2460PG and surprise surprise, it's the same panel as the PG248Q I had. Except, I can't get this thing to lose its signal no matter how hard I try. So I'm happy with that. I also can't overclock it, so the issue this panel has with these damn scanlines (if that's what they are) and the grid pattern can't be made worse. So, I don't know... I might keep this one. Sigh. I have until October 7th to make a final decision. It really pisses me off because this is a ~$400 monitor. Yes, it's really more like a ~$300 monitor because the G-SYNC module adds a good $100 or so, BUT STILL. When I bought my 8½-year old Samsung 2253BW, it was a simple process: ask Overclock.net what the best monitor under $400 is, get recommended the 2253BW, buy it, and be done. Today? LOL YEAH GOOD LUCK!!!

 

I'll be back later. I need to go destroy several large buildings with my bare hands now. I wish I could freely use profanity right now because goddamn. I just want to drop like a thousand F-bombs at the moment.

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It's a computer!
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CPUMotherboardGraphicsRAM
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250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
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Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
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Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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post #10 of 34
Quote:
Originally Posted by Falkentyne View Post

The "moving scanlines" thing is bizarre. That was never reported back when the Asus VG248QE was popular (the STATIC, not moving scanlines , were reported, usually in lightboost mode, and if you were unlucky, at 144hz and faintly at 120hz), and the only time this was reported on Benq monitors, was when the wrong vertical total (VT) was being used on Z series monitors for blur reduction. Changing the VT value would stop the scanlines from moving, but wouldn't remove them from the screen.

You're saying on your XL2430T, (and on the LG), the scanlines moved without a VT tweak even active?

I can't even disable instant mode on the XL2720Z at 144hz. The screen starts lagging EXTREMELY bad like it was being overclocked too far.
I can at 120hz (WITHOUT a VT tweak). There are no scanlines at 120hz without a VT tweak, and so faint they may as well be invisible at 144hz.
*edit* I don't see any scanlines at 144hz.

Yes, they move. The movement itself is kind of strange and difficult to describe. It's as if the lines are static but moving upwards at the same time. I don't have the monitor handy to examine it closely right now, but I think I know what leaves this impression of movement. Instead of being uniformly bright, one of the lines is a bit brighter, and that brightness migrates to the next upwards "scanline" row at every refresh. It's not just one row of brighter lines either, there's many of them distributed along the screen and they move upwards in tandem. So the position of the "scanline" grid itself is never actually moving, but it's "animated". I hope this makes sense because it's really difficult to put into words.
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