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8890 Get's HOT!!

post #1 of 12
2/14/04 at 3:59am
Thread Starter 
whenever i close the lid of my 8890 and let it just idle, the entire keyboard area gets HOT! i didn't think heat dissipates through the wristpad/ keyboard area because it doesn't get too warm during normal use


also, wouldnt the lcd panel being off allow it to cool some what better?


thanks, btw, it always get's better after about 5 minutes of opening the lid
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post #2 of 12
2/14/04 at 4:56am
Well, I've said it before and I'll probably say it again, in fact, here I am saying it. Don't close the lid with the machine on. At least not for any extended amount of time. Heat is dissapated through the keyboard and wristrest. Not a major portion of it but still quite a bit. And with the lid closed that heat has nowhere to go and so it builds up. Where do you think it would go? Its not real good for the LCD panel either. Actually, the build up is greater than with the lid open and the machine cranking, because when its doing that, the processors heat up and the fans come on. But with the machine idling, the processors are just leaking a little heat that dissapates up through the keyboard because the fans aren't blowing. But once there, its got nowhere to go so the temperature rises. The processors are probably just fine down below.

What's the point of closing the lid with the machine on? Why do it? I don't like to leave my machine running solo. Its probably silly, nothing will happen, but then again, you never know. If you have to close the lid for some neurotic reason, at least leave it ajar, say a half inch.
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post #3 of 12
2/14/04 at 3:18pm
Thread Starter 
ok, i didnt know that by design heat is dissipated through the keyboard. it makes sense as far as the buildup


i would close the screen if i was going somewhere for longer than 5 minutes just in case something happened to it while i was gone.
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post #4 of 12
2/14/04 at 3:38pm
Well, its not an intentional design feature. Its simply a matter of there being a source of heat energy (CPU, GPU, HDD, etc) inside of a container (case) that also contains a gas (air). The source will both radiate heat energy to the case which will absorb it and experience a temperature rise and conduct heat energy to the gas which will convect it to the case again absorbing it and experiencing a temperature rise. The upper side of the case will get the lion's share because warm air rises and so more heat energy is transfered that direction by convection. But it will also gets its share of the radiated heat. Normally, with the lid open, the keyboard and wristrest will then radiate to the room and also conduct to the air which can freely convect it away. With the lid closed, that radiant heat is absorbed by (and partially reflected and reradiated back) the lid/LCD assembly and the normal convection circuit is effectively blocked. In short, the closed lid acts like a blanket tossed over a sleeper, keeping that heat in.

Your rational could result in exactly what you feared, something happening to it while you were gone.
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post #5 of 12
2/14/04 at 7:21pm
Thread Starter 
i have learned my lesson! thanks for slapping my wrist without makign me write 100 times, "i will not close the lid while my computer is running!" :P
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post #6 of 12
2/14/04 at 8:36pm
I always have mine go into standby when I close my lid. Nice, safe way of protecting my screen :P And coming out of standby takes only a second!
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post #7 of 12
2/14/04 at 9:28pm
slap slap slap slap slap

Most of the heat buildup under the keyboard is due to the memory. The memory's heat spreader consists of the steel plate directly below the keyboard. GPU and CPU heat are handled by the main fans pumping out to the right.

slap (sorry couldn't resist that one)
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post #8 of 12
2/14/04 at 9:58pm
Quote:
Originally Posted by MARQUISDARQUIS
Well, its not an intentional design feature. Its simply a matter of there being a source of heat energy (CPU, GPU, HDD, etc) inside of a container (case) that also contains a gas (air). The source will both radiate heat energy to the case which will absorb it and experience a temperature rise and conduct heat energy to the gas which will convect it to the case again absorbing it and experiencing a temperature rise. The upper side of the case will get the lion's share because warm air rises and so more heat energy is transfered that direction by convection. But it will also gets its share of the radiated heat. Normally, with the lid open, the keyboard and wristrest will then radiate to the room and also conduct to the air which can freely convect it away. With the lid closed, that radiant heat is absorbed by (and partially reflected and reradiated back) the lid/LCD assembly and the normal convection circuit is effectively blocked. In short, the closed lid acts like a blanket tossed over a sleeper, keeping that heat in.

Your rational could result in exactly what you feared, something happening to it while you were gone.
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post #9 of 12
2/14/04 at 10:11pm

Steel?

Quote:
Originally Posted by aussie
slap slap slap slap slap

Most of the heat buildup under the keyboard is due to the memory. The memory's heat spreader consists of the steel plate directly below the keyboard. GPU and CPU heat are handled by the main fans pumping out to the right.

slap (sorry couldn't resist that one)

You sure that's steel and not aluminum. Steel is a terrible heat conductor while aluminum is quite excellent.
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post #10 of 12
2/15/04 at 12:59am
Quote:
Originally Posted by MARQUISDARQUIS
You sure that's steel and not aluminum. Steel is a terrible heat conductor while aluminum is quite excellent.
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post #11 of 12
2/15/04 at 3:14am
Thread Starter 
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post #12 of 12
2/16/04 at 2:34am
Hmm... From my older laptops (four of them, all the way back to Toshiba T3200SX), issues with heat buildup and the LCD being closed varied, and not by speed. Before the 8890, the original Toshiba above was the hottest, followed by a Celeron 466 (Dell 5800). The Dell however could be left on with the lid closed. And a number of the laptops that were designed for docking bays could be left closed too.

Your best bet is to carefully test by leaving open about 30 degrees for an hour or two, and put your hand on keyboard. But in general the powerful notebooks described on these fourums (Sager, Alienware, etc) are not designed to be left running with lid closed.
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