u/puffbringer

I bought a new LG OLED C5 TV mainly for PC gaming, and was really happy with it yesterday (Day 1). G-Sync/VRR was working fine, TV's refresh rate was syncing with game's frame rate perfectly, and games looked very smooth. Today I tried to play again, but all games had noticeable stuttering. Realized it's because Gsync is no longer syncing TV's refresh rate with game's FPS. Gsync is still enabled, on both the TV and in Nvidia Control Panel on my PC, but it's just not changing TV's refresh rate at all. In the TV's Game Optimiser menu it's showing a constant 119Hz (this number was changing yesterday, matching the game's frame rate), and if you click the green button on the remote multiple times it's showing more specifically that it fluctuates between 118.79Hz and 118.8Hz, even when the game's FPS drops way below that. I tested it with 4 different games, TV's refresh rate never changes.

In the photos I attached you can see the in-game FPS (top right corner) and TV's refresh rate arent even close to each other. Sorry for the wonky photos, I had to control the game's character to get the framerate to drop below 120 to show the problem, and take the picture at the same time.

I tried some basic troubleshooting:

- Making sure my display settings on PC set to 120Hz refresh rate

- Turning Gsync/VRR off and on again in the TV's Game Optimiser menu

- Switching to different picture modes on TV (Game optimiser, filmmaker, cinema etc.), making sure VRR is enabled in all the modes

- Disabling/re-enabling Gsync in Nvidia Control Panel

- Reinstalling Nvidia graphics drivers

- Resetting TV to factory settings

- Power drain TV - unplugged all cables, held power button for 30 sec, left TV to sit 10 min, the plugged everything back in

- Changing HDMI cables

- Changing to different HDMI ports

- Checking for software updates on TV (already have the latest version installed)

- Restoring my PC to a restore point from yesterday (when I know for a fact Gsync was working)

None of it helped, TV's refresh rate is stuck at 119Hz with GSync enabled. If I disabled Gsync/VRR it does go back to 120Hz, but that obviously makes it a Fixed Refresh Rate, which doesnt solve my problem. I have no idea what is going on with Gsync on this TV. Can anybody help me solve this please?

EDIT: Forgot to mention one thing. The TV did install a software update yesterday not long before I went to bed, so I'm not sure if that had anything to do with the problem.

I also uploaded a short clip on YT if anybody is interested: https://www.youtube.com/watch?v=3tf0SKFqqY0

But it basically shows the same problem in a video format - Game's FPS changes, while TV's refresh rate is stuck at a constant 119Hz with GSYNC enabled.

UPDATE: I have no idea what just happened, but I launched a game and suddenly Gsync is working fine. The TV's frame counter even showing the variable refresh rate matching the game's FPS, instead of just being stuck at 119Hz, and the game feels super smooth again: PIC

I just tried all the same solutions I tried several times earlier today. Like doing a clean reinstall of Nvidia driver, switching the TV between 144Hz and 120Hz modes, Resetting the TV to factory settings, disabling/reenabling Gsync (also Vsync in Nvidia App), restarting the PC for the 20th time today and so on. I don't know what did it, but it's working again. Could be it just fixed itself, hopefully permanently. Sorry to people who find this post on Google looking for a fix, cause this ain't much of an answer, I know. And thanks to all the people trying to help, maybe one of your suggestions worked in the end, I'm just not too sure which one.

This horizontal shadow keeps appearing at random. Only started happening when I switched my PC's display settings to HDR (including all my games). Since then every once in a while when I launch a game this shadow appears (usually after the screen has gone completely black for a few seconds while the game loads). The shadow can change shape too, for example when I open the full screen map in a game, the shadow might get smaller or bigger. Sometimes the shadow disappears completely if I look at a brighter scene like the sky. Even exiting the game doesnt always remove the shadow, you can still see it when looking at the desktop. Turning the TV off then on again fixes it for a while, but it can happen again the next day or the day after. The TV is less than 3 weeks old, and Amazon cant exchange it because they're out of stock, so my only solution is a refund, which I'm not too happy about because the price was really good on Amazon comparing to anywhere else. Anyone have any advice?

Fixes I've tried:

- Resetting TV to factory settings

- Updating to latest firmware (currently says it's V8-0012T01-LF1V545.002537)

- Unplugging all cables for 15min + holding the power button for 30 seconds to power drain

- Replacing HDMI cable