Okay I just tried again with shutting everything down and having my gsync compatible monitor completely off, then re starting with just TV and PC.

No more option for Gsync.
So as far as I can tell it seems to be a bug if both displays are detected and one is Gsync compatible (even if it's not being used or displayed to)

Sorry to disappoint, but apparently it almost works lol.

Owners of the c9 who upgrade from c7, how does brightness in hdr compare? Is it noticeably better, kinda the same or worse? From rtings’s review, seems like the c9 is a bit brighter in test windows and real scene but has worse abl. It may be down to panel variance though, so I’d like to hear some owners’ experience. Wanted to upgrade to c9 later this year, but the lack of hdmi 2.1 source and vrr is a bummer. Probably should wait for next year 48” c10, but I’m worried with my extensive use (8hr/day of mix hdr gaming and movies), the panel may degrade too much by then.

1440p 120hz works for gaming on 77C9 with a 2080ti direct via HDMI. Even in HDR
AND IT LOOKS GLORIOUS

video was set to 4k, 4:2:2 10bit before starting game (battlefield 5), switched to 2560x1440 at 120hz in game and it worked and stayed HDR no problem. Unless I go through my receiver I can't check what chroma sampling it is in, but it certainly looks great. It's gaming monitor smooth. It's going to be a tough choice between 4k 60 or 1440 120.
Proof attached.

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I wonder if rtings.com thoroughly test TVs anymore. They seem to rush to publish.
4K HDR input lag error on C9 and I don't understand their opinion on DTM.
C9's DTM works wonders on static metadata based HDR10. It's amazing. DTM gives DV a run for its money.

Lol how can you stand 1440p on a 77” screen? I’m playing 4k on a 55” oled and really want more pixel density. 40”-43” would be ideal for me. I bet 120hz is awesome though.

Same here. [email protected] works on my 2018 Q9FN as well. I choose 4K every time.
4K (which is 1:1 pixel matched) @ 120Hz would be different story though.

First of all, you like what you like, end of story for me.

Having said that, I'm curious: at what distance from your 55" are you playing for having such a clear preference for 2160p as opposed to 1440p?

Doesn’t Xbox one x do 1440p @ 120hz?

Yes it does. I tested Kingdom Hearts 3 and it was smooth as butter.


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I sit extremely close to the tv, less than 1m. I like to see all the close-up details in the game. And I’m near-sighted so yeah. If you sit further away probably 4k is not that discernible from 1440p. 77” is too big for 1440p nonetheless.

There's a real case of diminishing returns here. A person with 20/20 vision can see about 80 pixels per degree of their field of vision.
More pixels means you won't be able to see all the detail, fewer pixels and the pixels themselves become visible.

In order to hit the sweet spot of 80 PPD, there's a direct correlation between screen size, screen resolution, and viewing distance. It works out pretty nicely for 16:9 displays:
For 1080p, the ideal viewing distance is twice the diagonal screen size, and for 4K it's equal to the diagonal screen size.

Twice the resolution means you need to double the screen size or halve the viewing distance to see all the detail. And of course it goes even further with 8K, the ideal viewing distance is half the diagonal screen size. The screen pretty much takes up your entire field of vision when you're close enough to see all the detail. Achieving that in a home setting basically requires an entire wall to be the TV.

Is it hdr too at 1440 120hz?

How do you check the input source info on tv? For previous years you clicked upper left of screen with lg remote.

If you have 4K devises you will want cables with the badge below, great news is they are under $10 in most cases and found anywhere.....

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Vincent's review is up

Vincent used an EDID reader to reveal the VRR range is 40-120 Hz

You have to click the "..." button above the channel up and below the 9 key, then select info.


Weird my X always returns a your tv does not support this resolution when selecting 1440 / 120.

What I have learned: VRR range of the C9 is 40 Hz - 120 Hz according to Vincent.
The review is good as always.

up to 120 Hz is great. Now the question is whether it has any low framerate compensation if it drops below 40 Hz

Have a strange issue with my 65C9.

Its connected to my Denon av receiver via ARC and when I choose optical out on the C9 it switches on my receiver automatically and then goes to ARC sound mode on its own. Has anyone noticed this? It's a pain because on optical output I have my wireless Siberia 840 headphones connected, so everytime I choose optical on the C9 my Denon switches on automatically and I have to get up and switch it off. Lazy me :-)

Never had this with my 65B7.

Could someone pls test and see if they get the same behaviour?

Can someone measure the footprint of the 65" C9 stand? I am having trouble finding these dimensions anywhere.

Spoiler Alert, Vincent have the C9 best in class award. It’s interesting that he advises keeping dynamic tone mapping off. Plus, manual calibration is better? On the Sony A9F he preferred the dynamic HDR mode.


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Interestingly I felt the same sitting a few feet away playing 4k on my 55 E6, that I would appreciate even more pixels, but I gotta say, double the framerate at 120fps has a pretty magical quality even with less pixels. Less blur to discern more detail. I haven't tried much back and forth yet so I don't know which way I'll choose primarily. I can also probably get away with super sampling up to 4k at 1440p too. Pretty sure on xbox though I'd just leave it at 4k as the overall graphic quality would make 1440p less ideal vs max settings on PC.

Why intersting? LG's dynamic tone mapping brightens up any scene that doesn't have super bright highlights, a bit similar to samsungs tone mapping which is often critisized for ignoring the EOTF.

Anyone who wants an accurate picture would leave dynamic tone mapping off... At least with LG you have that choice, whereas on a samsung you're stuck with the inaccurate too bright picture.


A proper dynamic tone mapping algorithm would never go above the EOTF, only below it when necessary, but that is not how LG's dynamic tone mappng feature works...

I was impressed with the tone mapping on Sony’s A9F so LG has some work to do on their algorithm. On a non calibrated C9 it’s best to leave it off correct? I have to give it a go.


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I'm pretty sure they did this on purpose as the average TV watcher prefers a brighter HDR picture. Put two TVs side by side in the showroom and I'm sure most people will prefer the brighter picture which goes above the EOTF compared to the more accurate one.

Excellent review, but what he's not mentioning probably because his test set may not exhibit this problem is "most" 2019 LGs I've seen, have some issue in the CMS. Meaning oversaturated Red, Green, etc... or errors in other colors like brown and orange that isn't always correctable with the user controls and if you have to make large adjustments to try and minimize some of these errors, you run the likely risk of introducing artifacts. The only way to minimize and or correct these errors is by creating a new 3DLUT. I can show this manual vs Autocal with scans when I get a chance. Although there is calibration software such as LS that can do this perfectly, is also true that CalMAN's current 3DLUT implementation is not 100% and can introduce banding visible on test patterns as Vincent showed. Overall I feel it's better to have more CMS accuracy even thought there is some minimal banding that you can see with a test pattern or by viewing the 3DLUT and looking for errors. My feeling it's more important to go by what your eyes actually see vs technical disection. I have verified that the amount of banding is reduced on the 2019 LGs vs the 2018 LGs from my experimentation but i'm not sure why.

There are pro's and con's to every method and some can see this banding in content when pausing a frame, etc, but I've not been able to see this readily with normal content where as some of the other CMS errors can be more pronounced.

Every calibrator has their own process but just wanted to shed more light on this topic.

Thanks John. Vincent measured 700 nits peak by contrast every review I’ve seen has been around 850. Why the discrepancy?


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As I mentioned, there are still panel variations and his panel wasn’t one of the brighter ones and or it needed more adjustments to get the set to D65.

Wait. So based on what you just said, the dynamic tone mapping feature does not behave like dolby vision’s dynamic metadata?

Here you go!

First two pictures, my 77C9 - then rtings 65C9 and then a comparison screenshot of the C8 and C7 pics from Rtings - my pictures are the 3 on the left. The Filenames of the C series model are listed on the top left of the rtings photos.
Appears to me to certainly be using the same newer panel as the lower size model. It does not look similar to the C8 or C7.

Big Win!

As a note, I am digitally zooming in to the original photos, so I don't think I can get as much detail as the rtings review, but the shapes still look most like the C9 they pictured.

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Isn't that only if you've had your display's HDR calibrated?