Launched in the year 2022, the 75QNED999QB is a 75" 8K TV from LG. It features a True 10-bit IPS panel.
It can achieve a max resolution of 7680 x 4320 with a refresh rate of 120 Hz and pixel density of 118 ppi.
Picture Quality
Now, the very next specification of a display that will impact your viewing experience is Color Gamut.
LG has not provided a color gamut specification for this TV. But don't worry, we have other means to guess that. Now, since the TV features a 75 inch screen, it won't come with a cheap panel, so here we can assume its equivalent sRGB coverage to be 90-100% or above. The color accuracy on this TV should be Lifelike! It is capable of producing accurate colors AS IT IS intended.
What is Color gamut ?
Color gamut specification of a TV is the measurement of the range of colors that the TV can produce.
In layman terms, it tells the ability of a display to produce accurate colors. A display with low color gamut coverage will miss out on some colors (such as deep red), the result would be a "washed out" picture quality.
It is specified in different units - sRGB(most popular), NTSC, DCI P3 etc. It is upto the manufacturer which one they choose.
But don't worry, below is a chart that you can use to choose a TV with good color accuracy.
Now, after color gamut, you should look at the static contrast specification as it influences the picture quality substantially.
Understanding the static contrast ratio of a TV
There are two types of contrast specifications for a TV. Static and Dynamic. We are interested in static contrast ratio. Dynamic doesn't matter much.
This defines the intensity of black levels. That is, a TV with static contrast ratio < 1000:1 may produce black images something like this:

Apart from this, such TVs are likely to suffer from backlight bleeds that will rob your experience — as shown below.

Also, a TV with high constrast ratio allows you to see more details. So, resolution and static contrast ratio go hand in hand in a sense.
If given a choice, I will prefer a FHD TV with high contrast ratio over a 4K TV with low contrast ratio.
This TV features a static contrast ratio of 10000:1., enough to achieve deep blacks. The panel comes with local dimming feature which is a plus.
HDR is also supported on this TV in form of Dolby Vision, HDR10 Pro, HLG (Hybrid Log Gamma) and Dolby Vision IQ.
As for brightness, it is capable of producing a maximum luminance of 250 nits. The panel of this TV is powered by Mini LED backlight.
Gaming Performance
If you are planning to use your TV just for content consumption, you can ignore these specs. But if you are also going to use the TV for gaming or use it as a PC monitor, you should get a TV with the lowest input lag and response time.
Unfortunately, there is no specification for input lag on this TV. Now, since this is not a cheap TV from LG, input lag on this TV could be 20ms or below.
Understanding Input lag and response time
This lag is the amount of time at which inputs changes the content of the screen. For casual Non-FPS games, input lag doesn't matter much.
But ideally, look for a TV that comes with an input lag and response time of less than 20ms.
Dimensions and Ergonomics
The TV measures 75 inches vertically and 65.55 inches horizontally.
Speaking of thickness, it is 1.16 inches thick.
It weighs approximately 38.2 KGs and 3.4 kgs extra if you include stand.
Now, coming to ergonomics — a VESA mount with interface size of 400 x 400 mm is provided for wall-mounting. There is no Swivel, Tilt or Pivot feature support on this TV.
Hardware and Audio
The LG 75QNED999QB comes with a 4-Core CPU. However, LG didn't provide any information on the total RAM on the TV's official specsheet.
To power its UI, the TV runs webOS 22 Operating System.
For display connectivity, there is four HDMI 2.1 ports on this TV.
To connect USB devices, you have — 2x USB 2.0 and 1x USB 3.0. Other connectivity ports include — 1x Satellite In (Sub — F-type female), 1x Antenna (RF) (female), 1x Satellite In (Main — F-type female), 1x CI+ 1.4, 1x IR Out and 1x Ethernet RJ45.
Wireless connectivity options on this TV include Wi-Fi (5Ghz + 2.5Ghz), Wifi-Direct, Bluetooth 5.0 and DLNA.
Now, speaking of speakers, it is packaged with 4 x 10W speakers. It also comes with a built-in sub-woofer. So you may not have to invest on any external sound system.
Now, coming to power usage, it uses 189 Watts on average and 0.5 Watts on standby.
For powering this unit, you'll need an 220 V - 240 V/50 Hz - 60 Hz outlet.