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.
Since I work with equipment that gets pretty hot (you see it all the time in fire trucks), I can tell you for sure that your Samsung is really going to heat up, especially after it's been on for a few hours. Those bigger models like the QN65Q80D have way more processing power and dissipate more heat than smaller TVs. What matters now is figuring out if it's "normal" heat or if it's actually too much. Put your hand behind the TV (unplugged) and then turn it on, wait a bit and compare. If it gets warm to the touch like a phone charging, you're good. If it burns your hand or becomes impossible to touch, then something's actually wrong.
Air circulation is really crucial here, it's not just some random tip. If you've placed the TV right against a wall, inside a closed cabinet, or with pillows/stuff piled up behind it, the heat can't escape and the board ends up trapping everything. You need to leave at least like 10-15cm of space behind and on the sides for air to circulate freely. If it's inside a panel or shelf, open up the sides more or put fans pointing at the area behind the TV. It makes a huge difference, trust me.
If the space is fine and it's still heating up too much, then it could actually be a defect in the dissipation or the internal fan not working properly. But my bet is it's just a space issue. As for energy consumption, don't worry about it - getting hot after 5 hours of being on is super common and doesn't mean it's using abnormal amounts of power. Just let the TV breathe and it'll get way better.
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