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SOLVED: Can't get 120hz on LG tv from my Nvidia card, hekp!

post #1 of 15
Thread Starter 
I AM THE n00b.
HDMI 1 would not let me use 120hz for whatever reason. All other HDMI it works.
Specs:
Graphics card: 560ti (EVGA)
Display: LG 47LV5500-AU 120hz
Cable: HDMI 1.4

It is a 120hz tv and 120hz works fine on the cable line.

Steps taken thusfar:


Fresh install of windows on the pc (it had the same issue before the new OS) and fresh nvidia drivers.
--no 120hz, default 1920x1080@60hz
Check nvidia menu, refresh rate drop down does not have 120hz option.
Check TV settings, "true motion" (the 120hz option name) is off and un-selectable.
--I called lg support to find out that this is indeed the 120hz setting.
In nvidia control panel, I configured a custom resolution using all default values and manually set refresh rate to 120.
--no picture, after timeout goes back to 1920x1080@60hz



At step 4 things got tricky. When I go to the LG TV video settings (before the timeout, while the screen is black after I set refresh rate to 120) the true motion option becomes selectable and appears to be automatically enabled. But no picture!


WHAT I KNOW FOR SURE:
It's not the cable. I have used the cable to successfully play 120hz from a laptop to another TV (it was the 42" version of the same model LG).

.
.
.
Unfortunately I do not have a different 120hz capable display to try (as a trouble shooting step).
I have tried a different manufacturer (Gigabyte) 560ti with the same issue.
Please hekp!

Edited by mrwesth - 8/23/12 at 11:07pm
post #2 of 15
All tvs are 60hz and use motion interpolation. It does not matter if you have a 120 or 960hz tv, they all use motion interpolation.

http://en.wikipedia.org/wiki/Motion_interpolation
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post #3 of 15
You cannot use 120hz at 1080p via hdmi 1.4a, only at 720p.
a TV is not like a PC monitor where u can either use DP(display port), or DUAL LINK dvi-d cable for 1080p/120hz
Further info here:
http://www.tomshardware.com/reviews/tridef-stereoscopic-3d-gaming,3019.html
post #4 of 15
Thread Starter 
Interesting read.
So I guess that begs the question:
Why is the "true motion" option grey (un-selectable) when outputting at 1920x1080@60hz from the graphics card?
post #5 of 15
Thread Starter 
Quote:
Originally Posted by doscape View Post

You cannot use 120hz at 1080p via hdmi 1.4a, only at 720p.
a TV is not like a PC monitor where u can either use DP(display port), or DUAL LINK dvi-d cable for 1080p/120hz
I didn't mention it, but I actually did try 1280x720@120hz with the same results as 1080p@120hz--a black screen.
post #6 of 15
Quote:
Originally Posted by mrwesth View Post

Interesting read.
So I guess that begs the question:
Why is the "true motion" option grey (un-selectable) when outputting at 1920x1080@60hz from the graphics card?


HDMI can't do 120hz.
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post #7 of 15
Quote:
Originally Posted by mrwesth View Post

Interesting read.
So I guess that begs the question:
Why is the "true motion" option grey (un-selectable) when outputting at 1920x1080@60hz from the graphics card?

Set it to 720p and see if the option becomes available
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post #8 of 15
Quote:
Originally Posted by mrwesth View Post

Interesting read.
So I guess that begs the question:
Why is the "true motion" option grey (un-selectable) when outputting at 1920x1080@60hz from the graphics card?

Need to use HDMI to turn on frame interpolation and simulate 120hz. VGA is not usually supported by the onboard hardware in terms of advanced picture control and simulated 120/240hz.

Obviously answered already.... all HDTV's are 60hz MAX. If you are watching 23.xx fps video ie: a blu ray/film rip I would suggest running your TV at 23/24 or 48hz to get the smoothest picture possible.

Ideal imo would be running the tv at 23.97hz via HDMI and using the onboard processor to simulate 120hz. That would technically give you 5:5 pulldown, or 5 perfectly duplicated frames as opposed to 3:2 pulldown which is common with running 24fps media on a 60hz signal.
    
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post #9 of 15
Thread Starter 
Quote:
Originally Posted by Stoffie View Post

Set it to 720p and see if the option becomes available
720p @ 60hz
TruMotion still grey.
post #10 of 15
Thread Starter 
Quote:
Originally Posted by rmp459 View Post

Need to use HDMI to turn on frame interpolation and simulate 120hz. VGA is not usually supported by the onboard hardware in terms of advanced picture control and simulated 120/240hz.
Obviously answered already.... all HDTV's are 60hz MAX. If you are watching 23.xx fps video ie: a blu ray/film rip I would suggest running your TV at 23/24 or 48hz to get the smoothest picture possible.
Ideal imo would be running the tv at 23.97hz via HDMI and using the onboard processor to simulate 120hz. That would technically give you 5:5 pulldown, or 5 perfectly duplicated frames as opposed to 3:2 pulldown which is common with running 24fps media on a 60hz signal.

You lost me at 23.xx .

I am using an hdmi cable, yet frame interpolation is not simulating my 120hz.
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Overclock.net › Forums › Components › Monitors and Displays › SOLVED: Can't get 120hz on LG tv from my Nvidia card, hekp!