Launched in the year 2022, the 55GGU7900B is a 55" 4K TV from Grundig. It features a 10-bit IPS panel.
The max. resolution it can display is 3840 x 2160 @ 60 Hz with a pixel density of 80 ppi.
After screen size and resolution, the next most important feature of a display is its Color Reproduction Accuracy (defined by its color gamut specification).
Grundig did not provide a color gamut rating for this TV. So we have to take a guess. As this TV features a big 55 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! Meaning it will produce accurate colors AS IT IS intended.
Understanding the Color Gamut Specification
Color gamut spec of a display is the measurement of the range of colors that it can produce.
Meaning, this specification determines the ability of a display to produce accurate colors. A panel with low gamut coverage will miss out on some colors (such as deep red), thus producing a "washed out" picture.
Different manufacturers use different units to specify color gamut. Such as — sRGB (standard RGB), NTSC 1953, DCI P3 etc.
But you don't need to worry about that, here is a chart that you can use to choose a TV with good color accuracy.
After color gamut, next in the list is Static Contrast.
Understanding the static contrast ratio of a TV
A TV with low static contrast ratio will not produce deep blacks and possibly bleed backlight as shown in the below image:The image is an example of another display, it is not this one
The static contrast ratio of above TV is rated 800:1. So make sure you get a TV with a static contrast of >= 1000:1. Ofcourse, More the better.
Also note, static contrast ratio and resolution go hand in hand when it comes to details. To put it into perspective, a TV with low contrast ratio will show both dark gray and black as black, so lesser detail overall.
If given a choice, always prefer a FHD TV with high contrast ratio over a 4K TV with low contrast ratio.
We were not able to find a static contrast ratio specification for this TV. Once again we have to take a guess based on the TV's other specs. FYI — IPS panels come with a static contrast ratio between 700:1 - 1500:1. As for a 4K TV, we can assume the ratio of Grundig 55GGU7900B to be atleast 1200:1 or above.
HDR is also supported on this TV in form of HDR and HLG (Hybrid Log Gamma).
Coming to brightness, it is capable of producing a maximum brightness of 250 nits. The backlight of this TV is powered by Direct LED technology.
Now if you are going to use your TV other than watching videos — say as a PC monitor or for gaming purposes, make sure to take a TV that features the lowest input lag. For gaming, both input lag and response time impacts the performance.
Unfortunately, we cannot find the input lag specification for this unit. Now, since this is not a cheap TV from Grundig, we can expect an input lag of less than 20ms.
What is Input lag ?
This lag is the latency at which device inputs changes the content of the TV. Though, this won't matter much if you aren't into competitive/FPS games like call of duty.
But ideally, look for a TV that features an input lag and response time of less than 20ms.
Ergonomics and Dimensions
Now, speaking of ergonomics — a VESA mount with interface size of 300 x 300 mm is provided for wall-mounting. The unit doesn't come with either Swivel, Tilt or Pivot support.
The width of this TV is 49 inches while its height is 29.46 inches. Overall, it weighs 17.5 kgs. So plan your space accordingly.
Hardware and Audio
The chipset of this TV is powered by a Quad Core CPU. However, we could'nt find any information about the RAM on the TV's specsheet.
The UI on this TV is powered by Android TV Operating System.
For display connectivity, Grundig has provided three HDMI 2.0 ports on this TV.
For connecting USB devices, you will have two USB 2.0 ports. Other connectivity ports include — 1x Satellite In (F-type), 1x Antenna (RF), 1x CI+ 1.3 and 1x Ethernet RJ45.
For wireless connections on this TV, you will have — Wi-Fi (2.5Ghz) and Bluetooth.
Coming to audio, Grundig has provided 2 x 10W speakers on the TV.
As for power usage, on average, it consumes about 113.28 Watts. On standby, it uses 0.45 Watts.
For powering this unit, you'll need either a 110V or 220V outlet @ 50Hz-60Hz.