LG 48CX

[repoman0]

I bought mine last week and have 30 days to return to microcenter. Downsampling to 4:2:2 chroma is unacceptable for pc use so if it’s not fixed quickly I’ll have no choice but to return it. Luckily still have my monitor awaiting sale.

Edit: just saw it’s a known bug here for months. Packed up and will be returning. I’m not really happy with the size and extreme glossiness anyway for PC desktop usage. I’ll grab a 65” CX for my TV area instead.

 

[mirkendargen]

From AVS Forum thread:
https://www.avsforum.com/threads/2020-lg-cx–gx-dedicated-gaming-thread-consoles-and-pc.3138274/post-60111929

Yeah we tested all this at 1080p like 40 pages ago in this thread, heh. It seems to just be a TV bug.

 

[domenic]

I posted this over on AVS - https://www.avsforum.com/threads/20...consoles-and-pc.3138274/page-74#post-60111929

----------------------------------

As mentioned above we need to get some publicity to put a spotlight on the 4:4:4 at 120Hz issue to make LG aware of it and put pressure on them to correct it. This TV & video card isn't a random combination - rather its seems to be a marketing partnership between LG & NVIDA based on the fact its the only TV line GSYNC certified and had a product placement in the 30 series kickoff presentation. The last thing either company want is this tarnished.

We need to figure out how to get word to some of the YouTubers out there that are already doing videos with the LG CX series and the ones that frequently cover these kind of topics / issues already.

Two such channels (below) are Stop the FOMO (48K subs) and HDTVTest (217K subs). Recently both have covered the LG CX & C9 TVs and their integration with the upcoming new consoles and 30 series NVIDIA cards discussing the 40 vs 48 Gbps bandwidth controversy. If we could somehow get word of this to them I bet they would either do a video just on it or cover the topic in one of their other videos since both have said they are eagerly awaiting 30 series cards in order to specifically put the LG OLEDs through their paces. FOMO has already declared the LG CX OLED the best gaming TV currently in a couple of his videos. They also seem to have communication channels to many of the TV manufacturers since when they find discrepancies or issues with products they sometimes seem to get statements or clarifications afterwards.

So how do we get word to these guys or similar outlets so they can be our megaphone to raise awareness and hopefully put pressure on LG to correct quickly?

https://www.youtube.com/channel/UCqHuvvETx7PKapuchT2BnSA
https://www.youtube.com/channel/UCcCYOO2uYPnG-21WDOWdwew

 

[Lateralus]

I wonder if anyone has mentioned/asked in the rtings comments section of the 'CX as a monitor' review? They are pretty thorough and used to be good about responding to questions. They're probably established enough by now that they might have a more direct way to raise questions and concerns directly with LG also.

I might look later; surely this has come up by now...

Edit: Looks like someone did ask about it in general terms and they do plan on retesting once they have an HDMI 2.1 source. They probably weren't able to secure a 3080 either, so it might be a while. Hopefully their testing is very thorough when they revisit it.

 

[madpistol]

Was bored, so I decided to play some Battlefield 4 @ 4K, max settings.

HOLY BEJEBUS!!! I had forgotten how much fun this game was. Not only that, but it still has a massive player base. Also... it looks gorgeous on this display (as does pretty much every game). Plays like a dream, too.

Where's my freakin 3080?!?!?! Nvidia... lets go!!!!

 

[gamerk2]

So basically, putting aside some of the other known issues, the two big ones at the moment:

1: Black screen when VRR is enabled; affects C9 and CX [Likely NVIDIA driver bug?]

2: 120Hz resolutions being downsampled to 4:2:2; 60Hz resolutions display 4:4:4 as expected; affect CX, works on C9.

The first will get fixed by NVIDIA shortly. The second is likely a firmware bug given the C9 works as expected; its just a matter of brining it to LGs attention.

 

[domenic]

So basically, putting aside some of the other known issues, the two big ones at the moment:

1: Black screen when VRR is enabled; affects C9 and CX [Likely NVIDIA driver bug?]

2: 120Hz resolutions being downsampled to 4:2:2; 60Hz resolutions display 4:4:4 as expected; affect CX, works on C9.

The first will get fixed by NVIDIA shortly. The second is likely a firmware bug given the C9 works as expected; its just a matter of brining it to LGs attention.

Yes! Now we just need to figure out how to get this to LG & NVIDIA's attention ASAP as I mentioned above.

 

[NukeDukem]

Was bored, so I decided to play some Battlefield 4 @ 4K, max settings.

Yeah, I've gotten back into BF4 since picking up my 55CX. I do 1440p all settings maxed, with nVidia sharpening and 200% resolution scale. It's basically pegged at 119FPS, looks like 4k, runs like silk. It's fun as hell operating all the big ass vehicles on this big ass screen. Flying around in choppers and jets is fucking bliss. Makes me want to get into flight sims, it seems so realistic!

 

[kalston]

1440p with 200% scale? Why not just play at 4k then? Since you seemingly have the horsepower for 5k.

 

[NukeDukem]

1440p with 200% scale? Why not just play at 4k then? Since you seemingly have the horsepower for 5k.

Settings were carried over from the last time I had played, on a 1440p monitor. I did try 4k but things seemed more responsive at 1440. Perhaps reading about higher input lag @ 4k gave me some placebo effect. TBH it didn't look much different (to my eyes).

 

[lludson]

Yeah, I've gotten back into BF4 since picking up my 55CX. I do 1440p all settings maxed, with nVidia sharpening and 200% resolution scale. It's basically pegged at 119FPS, looks like 4k, runs like silk. It's fun as hell operating all the big ass vehicles on this big ass screen. Flying around in choppers and jets is fucking bliss. Makes me want to get into flight sims, it seems so realistic!

Great. Where do you find the settings for 200% scaling and shaprening?

 

[NukeDukem]

Great. Where do you find the settings for 200% scaling and shaprening?

A resolution scale slider exists in the in-game video options. Sharpening can be applied via the GeForce Experience overlay.

 

[Svengali]

John Archer just reported on the HDMI 2.1/RTX 3000 issues.

 

[kasakka]

John Archer just reported on the HDMI 2.1/RTX 3000 issues.

Sent him some further information on Twitter about my own testing. Hope articles like this push LG to fix the problems.

 

[elvn]

Hopefully 422 is firmware-eable . .....

And they get it straightened out by november

 

[MistaSparkul]

Hopefully 422 is firmware-eable . .....

And they get it straightened out by november

Lol given that they have known about other issues like raised blacks with Dolby Vision and have yet to do anything about it, once they do find about the 422 chroma reduction, I wouldn't be surprised if it takes them a year to fix it.

 

[lludson]

Darn it. I should have waited before buying three of these. For multi monitor gaming.

I have spent $5000 on something I didn't know would work well enough...or at least yet.

Ugh.

 

[MistaSparkul]

Darn it. I should have waited before buying three of these. For multi monitor gaming.

I have spent $5000 on something I didn't know would work well enough...or at least yet.

Ugh.

Just return it? Unless you are past 30 days.

 

[SoCali]

TBH I'm getting pretty sick of using this thing as a monitor. Really wish something comparable was available in 40" size.

Hopefully once I get a 3080/3090 and Nvidia/LG fix this 4K/120hz issue it will rejuvenate my enjoyment.

 

[Rainstar]

really want this to work out, OLED is so beautiful dont want to go back to a IPS or VA. that Alienware is rather expensive. I heard late 2021 2020 is where Oled below 48 inches will start coming to monitors. thats a long time to wait.

 

[Pr0Pain]

Darn it. I should have waited before buying three of these. For multi monitor gaming.

I have spent $5000 on something I didn't know would work well enough...or at least yet.

Ugh.

I still dont get why you would buy 3 of these instead of a kickass VR setup. Seems like a no brainer for Sim pits, where you can look around and really feel like you are in the game

 

[kasakka]

Darn it. I should have waited before buying three of these. For multi monitor gaming.

I have spent $5000 on something I didn't know would work well enough...or at least yet.

Ugh.

Other than your issues getting all of them to 4K 120 Hz, you will not notice a difference between 4:4:4 and 4:2:2 in gaming.

 

[lludson]

I still dont get why you would buy 3 of these instead of a kickass VR setup. Seems like a no brainer for Sim pits, where you can look around and really feel like you are in the game

Well, I just can't handle not being able to see my controls. I have a $3,500 F1 wheel coming that has a ton of controls on it. I don't like not being able to see around the room in general either. A Track IR works just fine for me for looking around in sims if I want the head motion. But right now these babies give me 180 degrees of view. That is fantastic.

kasakka - Yeah. I just hope I can eventually get the 3 @ 4k 120 hz - preferably in HDR, which also doesn't seem possible right now. I hope getting another Club 3d adapter and going all display port will help me with this, along with a fix from LG. Maybe I have to start with them at @60hz for a while. Certainly this must be fixable through firmware? They have to do it. They've advertised this display as being that capable, touting the features. And maybe the move from my old Pascal Titan XP's to a 3090 will help. I have no idea.

@MistaSparkful - I was thinking about returns. I didn't get them locally though. I have 3 similar sized 1080p TV's in the house which are really in need of an upgrade anyway. They are all 10 years old+.

UPDATE:
- I have all 3 screens running at 1440p @120 w/HDR.

- 2 are at 10bpc, RGB, Full DR

- The one on HDMI is at 8bpc, RGB, Full DR

 

[kasakka]

kasakka - Yeah. I just hope I can eventually get the 3 @ 4k 120 hz - preferably in HDR, which also doesn't seem possible right now. I hope getting another Club 3d adapter and going all display port will help me with this, along with a fix from LG. Maybe I have to start with them at @60hz for a while. Certainly this must be fixable through firmware? They have to do it. They've advertised this display as being that capable, touting the features. And maybe the move from my old Pascal Titan XP's to a 3090 will help. I have no idea.

Have you tried if they work at say 1080p or 1440p 120 Hz together? I think your use case is a very specific niche thing. The Pascal Titan XPs are most likely part of the problem, I don't know if they even support DP 1.4 and they definitely don't support it with DSC so the Club3D adapter might not help.

 

[lludson]

Have you tried if they work at say 1080p or 1440p 120 Hz together? I think your use case is a very specific niche thing. The Pascal Titan XPs are most likely part of the problem, I don't know if they even support DP 1.4 and they definitely don't support it with DSC so the Club3D adapter might not help.

kasakka - yes they do work at 1440p, 120hz + HDR. I had just updated my last post. I am running into trouble when I then try to change a DP monitor to 4k 120hz. All my screens go black. And I have to unplug the DP monitors. Sigh.

 

[lludson]

I am also running into a problem (Triple CX's) whereby the screens dim when there has been no activity on them. I have not timed it yet. But anyone know what is going on? Is there some sort of dimming setting on a timer for the TV to help prevent burn in?

If I move a drag a window on a dimmed screen, it turns to full brightness.

UPDATE:
- I just turned off power saving mode in the general/additional settings/ menu area. Will see if that does the trick. --- Nope. That wasn't it.

 

[elvn]

I'd consider upgrading to a custom 3000 series card that has two hdmi 2.1 outputs, if possible. Then you'd only have to use a single dp adapter.

I'm using two dp adapters on 43" 60hz 4k side monitors which I use for desktop apps incl. browsing, watching streaming apps and other multimedia, file managment, chat apps, readouts and progress meters, screenshot app, 3rd party notepad, some image editing, etc etc. Once in awhile when I wake up the screens from idle, one will blink it's desktop several times until it gets a solid signal. Occasionally one of the two will just have no signal on wakeup and I'll have to hot plug it's hdmi cable on the adapter. Luckily they each have a different colored end on their hdmi cable so it's easy to tell which is which.

I'm using a 32" 1440p VA g-sync monitor at 144hz in the middle on displayport, plus the two 4k 60hz hdmi 2.0 tvs-as-monitors each on a dp adapter. I could try putting one of them on the hdmi port to see if that avoids the issue happening again. It should, at least for one of the two.

A few other details:
-- I'm running off of 1080ti SC Hybrid gpus
-- It only happens to one or the other 4k hdmi monitor, never both, and never the dp 1.4 to dp 1.4 g-sync monitor
-- It doesn't happen every wakeup. That is, at least having completely no signal doesn't happen every time. The blinking briefly happens to one or the other monitor on display wakeup pretty regularly, but never both at the same time.
-- I'm using good 18Gbps cables. I do have a few 48Gbps cables I just bought ahead of time that I could swap out to test with. They are 6' or 10' copper cables, not fiber.
-- Since they aren't OLEDs , I have the screens time out after a few hours to standby.

I think it's a HDMI handshaking issue with the adapters. They are good adapters and otherwise work 100% after the handshaking.

I've had things like the windows store netflix app turn one or the other hdmi TVs black when it is running while netflix in a web browser would not. That is another HDCP/handshaking issue. It never happens to the displayport gaming monitor in the middle of the array.

 

[kasakka]

kasakka - yes they do work at 1440p, 120hz + HDR. I had just updated my last post. I am running into trouble when I then try to change a DP monitor to 4k 120hz. All my screens go black. And I have to unplug the DP monitors. Sigh.

Your Titan Pascals don't support Display Stream Compression so I think that is the issue here. Just not enough bandwidth. You could try if it works if you set the displays for 4:2:0 chroma subsampling as 4K 120 Hz 8-bit 4:2:0 SDR is possible even over HDMI 2.0 on the CX series.

 

[lludson]

Your Titan Pascals don't support Display Stream Compression so I think that is the issue here. Just not enough bandwidth. You could try if it works if you set the displays for 4:2:0 chroma subsampling as 4K 120 Hz 8-bit 4:2:0 SDR is possible even over HDMI 2.0 on the CX series.

Ok! Thanks so much for all of your help and knowledge! I think I will remain patient until the 3090 comes out. As for now, this 1440p looks really solid TBH. I can totally deal with this until I can upgrade the video card.

Cheers, man!

 

[kasakka]

I am also running into a problem (Triple CX's) whereby the screens dim when there has been no activity on them. I have not timed it yet. But anyone know what is going on? Is there some sort of dimming setting on a timer for the TV to help prevent burn in?

If a move a drag a window on a dimmed screen, it turns to full brightness.

This is ASBL or Automatic Static Brightness Limiter in action. It will start to dim the display when it detects static content, which happens to be basically all the time on a desktop display. The way to reset it is to show for example a bright white window or play a video or something.

But the real fix for that is to turn off Automatic Static Brightness Limiter in the service menu. You can google for instructions, you need the LG service remote (from eBay) or an Android phone with an IR Blaster and the LG Service Menu app (a few bucks). I used the Android phone route with an old Samsung Galaxy S4 and it worked well.

Just DO NOT TOUCH THE "InStop" menu as you could apparently easily mess up your OLED if you try the wrong things there.

 

[ChronoDetector]

Is anyone using the BX version which is the entry level of the OLED 2020 series? I'm using the 55" BX model and 1440p and 1080p @ 120Mhz works fine for me with full 4:4:4 chroma. I don't have a HDMI 2.1 source or a NVIDIA 3000 series card so I cannot confirm if it can do 4:4:4 120Hz at 2160p.

 

[elvn]

I am also running into a problem (Triple CX's) whereby the screens dim when there has been no activity on them. I have not timed it yet. But anyone know what is going on? Is there some sort of dimming setting on a timer for the TV to help prevent burn in?

If a move a drag a window on a dimmed screen, it turns to full brightness.

There are a lot of technologies in the newer OLEDs to help prevent burn in. Personally I would set screens to run a slideshow or other screensaver after a set period, and I'd set one in the energy saving settings of the tv's OSD in case the operating system, an app, or pc hardware crashes to a static screen. I wouldn't turn off auto dimming features unless I were running something dynamic in full screen that the dimming wasn't recognizing as something it shouldn't dim.

It's too bad there isn't some blacklist/whitelist for apps with a fullscreen checkbox that you could load into the OSD using an LG app. A tech like that would be useful to disable the dimming timeout or increase the dimming timeout by a great amount while certain apps are running.

You could probably set a minimize/restore hotkey in displayfusion pro, or even a window highlight or window focus hotkey or some other unobtrusive displayfusion screen action. So you could set one up for each monitor or one global action. Then you could just hit the hotkey to wake all of the screens up from dimming when you need them. Personally I tie a lot of window managment and app launching to a streamdeck using displayfusion hotkeys. I can also connect hotkeys to my low profile dual pedal peripheral under my desk or any of my "num pad" style buttons on my "mmo mouse" (perdition red dragon).

With three screens I'm not really focusing on them all directly at the same time anymore so the dimming really wouldn't bother me as long as it was bright when I looked at it. That makes me wonder if you could benefit from an action tied to an eye tracking setup like those some streamers use. Then, whenever you looked at a particular monitor, the action would "wake it up" from being dim.

https://gaming.tobii.com/product/eye-tracker-5/

Intuitively interact and navigate in Windows 10 with ease. Use features such as mouse warp, to teleport your cursor to where you are looking, or swap between programs and screens using your eyes.

 

[lludson]

kasakka - You are totally the man.

 

[Braamer]

TBH I'm getting pretty sick of using this thing as a monitor. Really wish something comparable was available in 40" size.

I am with you on this one. I had a 43" 4k monitor for a while, and it was slightly larger than I wanted. Give me a 40" option, and I wouldn't be able to resist.

 

[lludson]

elvn - Thanks, man! Really interesting stuff too. Yeah I have yet to really use this setup a lot. I think I will leave it be for a bit and see. I haven't even gamed yet in F12020 with the triple monitor. That is next!!

Btw. I have ribbons screen saver set to 3 mins. And move my desktop icons or windows around a few times an hour. Paranoid about burn in! Will be interesting to see if anyone runs into it.

 

[vegeta535]

I am with you on this one. I had a 43" 4k monitor for a while, and it was slightly larger than I wanted. Give me a 40" option, and I wouldn't be able to resist.

I agree. I would pay $1k in a heartbeat for a 40" OLED for my computer.

 

[Arulan]

While I agree that a smaller (than 48") display would be better, it's really just a matter of being able to sit at the right distance, right?

I've posted my setup before, but sitting at ~48 inches away, wall-mounting it, and having it just a little lower than desk height is pretty much ideal (for me).

 

[elvn]

Well, I just can't handle not being able to see my controls. I have a $3,500 F1 wheel coming that has a ton of controls on it.
<......>

Do professional drivers have to look at their controls IRL?

I do get that you like the open area feeling. VR is boxed in, literally, and also can run into some heat discomfort issues inside the "box" depending how aggressive you get too (especially sweaty workout games). My main issue was the screen door effect (especially on long view scenes/areas in movies and and games) and the limited resolution on the Quest 1. For the most part in the VR gen just coming out (quest 2 ~ $300, hp reverb G2) the screen door and resolution issues at least shouldn't be as much of a problem anymore.

In future gens the rez should keep increasing to the point where in-headset and AR/mixed reality virtual screen use - as if holograms of screens placed in your room - will actually be fully usable at decent resolutions within the greater rez of the headset itself. That and hopefully they will start being more like oversized glasses (think something like smaller hololens) rather than lunchboxes.

 

[elvn]

While I agree that a smaller (than 48") display would be better, it's really just a matter of being able to sit at the right distance, right?

I've posted my setup before, but sitting at ~48 inches away, wall-mounting it, and having it just a little lower than desk height is pretty much ideal (for me).

View attachment 281246

That's the way to do it. Nicely done.

I'm using a separate "island" desk shaped like a xbox one controller that is on caster wheels and I keep my monitors and monitor arms on their own bench like desk. I just redid the whole setup so that my side monitors are now in portrait mode and are far enough away to fit a 48" or 55" OLED in november. So the side portrait monitors are where the speakers are in your picture more or less. I'm trying that out at 48" away to utilize the array better at it's new extents and get everything set up right ahead of time.

At this distance my 43" 4k monitors benefited from increasing the scaling to 125% but it should be fine for a 48" or 55" OLED at 100% 1:1. If I were to sit much farther I'd have to scale all of them, so yes distance is entirely the determining factor of how big the screen and the pixels appear in your personal FoV.

 

[lludson]

Do professional drivers have to look at their controls IRL?

I do get that you like the open area feeling. VR is boxed in, literally, and also can run into some heat discomfort issues inside the "box" depending how aggressive you get too (especially sweaty workout games). My main issue was the screen door effect (especially on long view scenes/areas in movies and and games) and the limited resolution on the Quest 1. For the most part in the VR gen just coming out (quest 2 ~ $300, hp reverb G2) the screen door and resolution issues at least shouldn't be as much of a problem anymore.

In future gens the rez should keep increasing to the point where in-headset and AR/mixed reality virtual screen use - as if holograms of screens placed in your room - will actually be fully usable at decent resolutions within the greater rez of the headset itself. That and hopefully they will start being more like oversized glasses (think something like smaller hololens) rather than lunchboxes.

Gotcha. Yeah I have tried VR. It is certainly fun and immersive. I had the same issues for quality. It was not high res enough. And I didn't find it comfortable.

Drivers don't always look directly at their wheels. Periphery is everything though when you don't look. My wheel resides just 3" lower than my eyes when I strap in. The LCD screen I will end up having in the center of the wheel - while I already have one on my current F1 Wheel, is also going to be crucial. I run my sims without the wheels and driver hands too. It's redundant and just blocks your driving view in some cars, like F1. Maybe I will take a pic when the game is running and post.