I bought a Samsung from the QN65Q80D series a few months ago and I noticed that after it's been on for like 4 or 5 hours it gets pretty hot in the back. I'm worried it might damage the TV or that it uses a lot of energy. Does any technician know if this is normal or if it's a defect?
It's normal for it to get a bit warm, especially with bigger models like yours, but if it's getting really hot to the point where you're worried, it's better to check if there's free space behind and around the sides of the TV - sometimes people push everything right up against the wall and it really messes with the ventilation.
Try moving it about 10-15cm away from the wall and leave some space, if it keeps getting excessively hot after that then maybe you've got a problem and it'd be worth calling Samsung to check it out, but in most cases it's just a lack of air circulation.
Especially after being on for hours, but the important thing is to check if there's enough space behind and on the sides for air to circulate - a lot of people put the TV right up against the wall or furniture and it gets way worse.
If you have like 10-15cm of free space in those spots and it's still heating up too much to the point where it burns your hand, then yeah, it's worth calling a Samsung technician to see if the cooler is working properly.
QLED televisions like yours generate significant heat because the panels need quite a lot of energy to reach all that brightness, and that's especially true for larger models. Now, there's a detail that the others didn't mention: besides leaving free space behind, you need to check if the TV is in a location with adequate air circulation. If it's inside a closed niche, under a shelf that's too close, or in a piece of furniture like those home theater setups that don't let the back breathe properly, heat will build up even if you think you have space. Move it to a more open space for a while to see if it actually gets that hot.
Another important thing is to check your picture and power settings. If you've got brightness maxed out or the TV in "dynamic mode" all the time, it's going to work much harder. Turn the brightness down to a comfortable level for your room (it doesn't need to be at that absurd maximum) and switch to standard or power-saving mode if you're not watching something that requires top quality. That takes a lot of the thermal load off. If after doing these things the TV keeps getting so hot that you can't keep your hand on the back for more than a few seconds, then it's worth calling a technician because it could be a problem with the fans or internal heat dissipation.
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