Supported Resolutions
1080p @ 60 Hz @ 4:4:4 : Yes
1080p @ 120 Hz : Yes (native support)
1440p @ 60 Hz : No
1440p @ 120 Hz : No
4k @ 60 Hz : Yes
4k @ 60 Hz @ 4:4:4 : Yes
4k @ 120 Hz : No
8k @ 30 Hz or 24 Hz : No
8k @ 60 Hz : No
The LG B8 supports most common resolutions without any issue.
4k @ 60Hz @ 4:4:4 or @ 4:2:2 is only supported when HDMI ULTRA HD Deep Color is enabled.
4:4:4 Chroma is only properly displayed when the input mode (Input icon) is set to PC.
In PC Mode, Sharpness at 20 means that there is no added sharpness.
Unfortunately, 1440p is not supported on this LG B8.
This TV does not have the new Alpha 9 processor, but it is still able to play our 1080p @ 120Hz test file perfectly at 120Hz without dropping any frames.
HDR in the PC input mode appears to be bugged, as we've seen with many 2018 LG TVs: colors are washed out and have more banding, and 4:4:4 chroma subsampling is not shown properly.
Update 07/24/2018: The PC mode Sharpness setting for no added sharpness was mistakenly written as 0 (The true value is 20). The review has been updated.
Update 11/27/2018: We retested with the latest firmware update (04.10.06) and found 4k @ 60Hz @ 4:4:4 + 8 bit HDR is properly displayed.