Although LG advertises the TV as having. support for variable refresh rate and have released a firmware update. to enable it, we were unable to make it work with our Xbox One S. We tried with a PC equipped with an NVIDIA RTX 2070 graphics card too, but it was unsuccessful.
The 75SM9970PUA has exceptionally low input lag and feels very responsive, as long as you're in 'Game' mode. Unfortunately, we couldn't get it to run in 4k @ 120Hz or in native 8k. To display proper chroma 4:4:4 with low input lag, you have to change the input icon on the Home dashboard to 'PC'. Auto Low Latency mode only works with compatible devices such as the Xbox One, and needs to be activated for the input in which the console is plugged in.
The 75SM9970PUA supports most common resolutions. It can display proper chroma 4:4:4 as long as you're in 'PC' mode, which is important for text clarity. For high bandwidth resolutions such as 4k @ 60Hz with HDR, the HDMI Ultra HD Deep Color setting must be enabled. This setting has two options. At this time, the 8k option may cause compatibility issues with older devices and should only be used if the connected device supports a higher bandwidth connection, so it's best to choose the 4k option, which will allow full bandwidth for HDMI 2.0b.
We were unable to get an image in 4k @ 120Hz and in 8k. We will retest this once a firmware update. is available.
Although this TV is advertised as having. support for HDMI 2.1, we couldn't test it, as there are no HDMI 2.1 sources at this time.
This TV supports eARC, which lets you send uncompressed object-based audio such as Dolby Atmos via TrueHD and DTS:X via DTS-HD over HDMI. To use eARC, audio must be set to 'passthrough' and eARC set to 'On'.
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