1080p 120hz TV detected by PC at 60hz

[lonlonmilklover]

Short and sweet, I am plugging an HDMI cable from my Nvidia GTX 1060 video card to my LG 42" 1080p 120hz LCD TV only to find that Windows, Nvidia Control Panel, and all games detect my monitor as being 59 or 60hz.

I'm a little confused - is the TV manufacturer lying? Or is an HDMI cable unable to detect 120hz displays? (or is it a software driver issue? my display driver is "Generic PnP Driver")

 

[James Mason]

List the EXACT model number of the TV.
Also go into Nvidia Control Panel, you may have to set a custom resolution (with a custom refresh rate) to get it to work right.

 

[lonlonmilklover]

TV Brand and Model is:

LG 42CS570

I did some digging and am a bit irritated.

This TV was advertised by the manufacturer as a 1080p 120hz LCD HDTV.

Well, it has no Display Port and I didn't really have a great graphics card anyway so I've just used the HDMI ports for my consoles, blu ray player, PC et cetera over the years.

Now that I have a nicer graphics card, I wanted to optimize everything and I realized - this isn't a "real" 120hz tv. From page 48 in the manual:

TruMotion: "Makes video clips recorded in film look more natural by eliminating judder effect. DVD and Blu-ray movies are filmed at 24 frames per second (fps). With LG Real Cinema, every frame is consistently processed 5 times in 1/24 of a second producing 120 fps with TruMotion or 2 times in 1/24 of a second producing 48 fps without TruMotion, thus totally eliminating the judder effect. This function can also work when TruMotion is off."

.... only by Motion Interpolation is the display 120 fps, emulated.

I guess that speaks volumes Ugh.

 

[sizzling]

All TV's only accept a max input of 60Hz, they do not work like high Hz monitors.

 

[James Mason]

Ahh yes, I see, looks like it's not actually 120hz then as you've said:
https://en.wikipedia.org/wiki/Motion_interpolation
Apparently it's also known as the Soap Opera effect (and probably explains why I get an awkward feeling whenever I see a soap opera on TV)
https://www.cnet.com/news/what-is-the-soap-opera-effect/

 

[ThePCnoelitist]

HDMI Does not supports 120hz, you need a DisplayPort or à DVI (they both support 120 hz) I also had this problem

 

[James Mason]

HDMI Does not supports 120hz, you need a DisplayPort or à DVI (they both support 120 hz) I also had this problem

Newer versions of HDMI do support 120+hz. 1.3 and up I believe.