QN80F is a representative of the Neo QLED series, which means it's a television with Mini LED backlighting. Unlike its cheaper cousin, the QN70F model, here the diodes are placed directly behind the panel (rather than at the edges), which gives a solid advantage in contrast control right from the start. In the 65-inch variant we tested, we counted 88 local dimming zones – a result that may not be particularly impressive, but as it turned out, sufficient to achieve quite decent results.
In tests based on scenes from movies like Oblivion and The Meg, the QN80F performed well – blacks were deep, and the overall image consistency was eye-catching. However, in more demanding moments (e.g., scenes with a lot of bright details on a dark background), a halo effect appeared. This is where the limitation of the number of zones shows – bright elements could bleed into each other, and some details in dark areas lost sharpness and contrast. In one of the helicopter scenes (The Meg), we even noticed a slight flicker in brightness, as if the television was trying its best to maintain visibility of details at the expense of black depth.
However, these are not problems exclusive to this model – the halo effect or contrast drops in very complex scenes are something most Mini LED televisions struggle with, even the more expensive ones. In its class, the QN80F still performs positively and offers clearly better contrast than the QN70F model with edge lighting. For most users, this will be a level more than sufficient – though not ideal.
LG MRGB85 uses a VA panel, so even without extra measures it delivers better black levels than models based on IPS or ADS panels. In simpler scenes the picture has decent depth and can look quite convincing. The biggest limitation, however, appears once local dimming is enabled. The TV uses edge-lit backlighting placed at the bottom of the screen. As a result it cannot precisely control the brightness of small areas of the image. When a single bright element appears on a dark background, an entire vertical strip often lights up. This is accompanied by a noticeable halo, and what stands out even more is the backlight's behavior. During scene changes the brightness can rise and fall abruptly, causing the image to visibly pulse in a dark room. Local dimming can be turned off completely in the TV's menu. Contrast then drops noticeably, but the picture becomes much more stable and the frequent backlight flicker disappears. In practice, some users may therefore consciously give up deeper blacks in favor of a calmer, more predictable image.