A disclaimer right up front: the points I’m going to cover don’t automatically doom a smart TV. Even if a TV is cheaply made, it might still beat the longevity odds, or at least survive long enough that you’ll be ready to upgrade by then. The odds may actually be better than ever, since low-end TVs have benefited from decades of evolution at the high end. A $300 QLED from 2026 can wipe the floor with a $2,000 model from 2016.

Nevertheless, signs may suggest a TV is more likely to fail prematurely. If you encounter two or more, it’s worth spending a little extra upfront to avoid paying a fortune for an out-of-warranty replacement. Under the harshest circumstances, a single sign can be enough.

Loose ports and housing

Cutting too many corners, literally

You might have to manhandle a TV to test this one, but the point remains. If its chassis has unnecessary gaps in its seams, and/or creaks excessively when it’s turned or grabbed, that’s a sign of poor overall build quality. More than that, there’s the specific threat of dust, lint, and other debris slowly filtering in over time, which can trap heat or increase the chances of severe static shock. As if that weren’t bad enough, moisture from a humid room might accelerate corrosion.

Try jiggling the HDMI or power cables on the back of a demo TV, assuming you can reach them without having to move the rest of the TV that much. On a well-built product, there will be little if any movement in the ports the cables are connected to. If they’re clearly loose, they might disconnect entirely later on. In any event, that’s especially bad design or quality control.

Poor ventilation

Give it a hand (test)

Heat is the killer of most TVs, ultimately. All electrical components produce waste heat, and it’s this stray energy that degrades materials over time. Eventually, one component or another is going to give. The hope is just that this will happen a decade or so down the road — not two or three years.

On a demo unit, you can test its operating temperature by placing your hand on various parts of the back panel. The TV should feel warm at most, never uncomfortably hot. You might also test the air coming directly out of the vents, but this doesn’t necessarily tell you anything. High vent temperatures could mean the TV is actually doing a fine job, only that there’s a lot to expel because of high performance.

Outdated specs

Is that TV already old or beaten?

Normally, the only consequence of outdated ports, processors, panel tech, or memory on a TV is that you won’t get the best out of your media — which counts the most if your goal is to connect a PC or game console. It can also be a sign that a TV was built as cheaply as possible, however, or that it’s a few years old. Used or demo units sometimes have one foot in the grave as a result of rough treatment. At this point, I’d outright refuse to buy a TV that doesn’t have at least one HDMI 2.1 or 2.2 port.

Remember that industry evolution I talked about in the intro? Older versions of components are naturally less refined, which could manifest in issues like lower power efficiency. While I wouldn’t worry too much about design flaws as long as a set was built in the last five years, the idea should still be on your radar.

A thick chassis with a thick power brick

A suspicious duo

When designers and engineers are working on a modern TV, they typically take one of two approaches to the power supply: keeping it all internal, resulting in a thicker chassis but little more than a cord on the outside, or improving thinness by making the supply external. There are legitimate reasons to go in either direction, particularly since “thick” TVs these days are a miracle next to what existed 10 or 20 years ago.

You might know where I’m going with this one. If a TV seems thick yet still ships with a bulky power brick, that raises questions not just about age, but whether the manufacturer is cheapskating by turning to generic third-party components. In-house parts tend to be better optimized.

The dirty screen effect

No excuse for this one

I can’t recall the last time I witnessed this in a store, but if a demo TV displays dark or cloudy patches in images (not seen here), you shouldn’t chalk it up to onscreen content or a temporary glitch. What you’re seeing is at least a flaw with the demo unit’s display panel, and it might reflect on a company’s overall quality control. You wouldn’t buy a car if the showroom model had visible defects.

There was some compromise needed back when budget TVs used technologies like edge lighting. Today, anything worth buying is equipped with full-array backlighting (a.k.a. full-array local dimming), if not OLED, which employs self-illuminating pixels. There’s just no excuse for a TV that lacks clear, accurately lit pixels from one corner to another.