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04-22-2021, 11:49 AM
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#16
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LQ Sage
Registered: Nov 2004
Location: Saint Amant, Acadiana
Distribution: Gentoo ~amd64
Posts: 7,675
Rep: 
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I didn't say install it, I merely suggested to try it to see if the sensor reading is different.
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1 members found this post helpful.
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04-22-2021, 12:20 PM
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#17
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LQ Newbie
Registered: Apr 2021
Posts: 23
Original Poster
Rep: 
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Quote:
Originally Posted by Emerson
I didn't say install it, I merely suggested to try it to see if the sensor reading is different.
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Will do, thanks!
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04-22-2021, 01:15 PM
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#18
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LQ Newbie
Registered: Apr 2021
Posts: 23
Original Poster
Rep: 
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Okay, folks, it's over!
I couldn't resist but open the laptop and turn it on while having direct access to hardware.
This chip is ridiculously small, it slightly warm but not even close to these bogus values. Meanwhile, when I ran "sensors" again it still showed 90+ several times.
Anyway, sorry I didn't do it right away, and thank you all for your thoughts.
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04-22-2021, 02:25 PM
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#19
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LQ Guru
Registered: Jan 2006
Location: Ireland
Distribution: Slackware, Slarm64 & Android
Posts: 17,278
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You're fine. Mark this solved, then.
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04-22-2021, 02:26 PM
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#20
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LQ Addict
Registered: Dec 2013
Posts: 19,872
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Quote:
Originally Posted by alexander_linux_user
bogus values
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The reading could still be from somewhere inside the chip; 100 deg. C could be well within spec, as I think somebody already pointed out in this thread.
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04-22-2021, 11:17 PM
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#21
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LQ Newbie
Registered: Apr 2021
Posts: 23
Original Poster
Rep: 
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Quote:
Originally Posted by business_kid
You're fine. Mark this solved, then.
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Done!
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04-22-2021, 11:30 PM
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#22
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LQ Newbie
Registered: Apr 2021
Posts: 23
Original Poster
Rep: 
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Quote:
Originally Posted by ondoho
The reading could still be from somewhere inside the chip; 100 deg. C could be well within spec, as I think somebody already pointed out in this thread.
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Considering how tiny the chip is, I don't buy that it could be about 100 deg. C, if it's hot the whole DW1810 element should be hot enough, I did remove it completely, and there were no signs of overheating at all. Could this element be made from a material that locks heat inside the chip? Likely not.
Also, interestingly enough, the laptop doesn't have a fan at all which hints that the manufacturer is confident that it won't overheat.
Sometimes, I feel that the laptop is pretty warm but the warm area is a lot larger than the WiFi module, it looks like it coming from RAM. Buying a cooling pad could be a good idea to stop being worried about it at all.
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04-23-2021, 05:28 AM
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#23
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LQ Guru
Registered: Jan 2006
Location: Ireland
Distribution: Slackware, Slarm64 & Android
Posts: 17,278
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On maximum heat from a chip:
There are a number of thermal junctions in any chip which are best viewed as thermal resistances. It's also not the temperature you see now, but the worst case scenario that you have to calculate for.
Tj=150ºC is max in the wafer. Cooling from the legs of the chip can be ignored, because tracks are too thin to have much effect. So, at case=100ºC, your wafer will be ≥125ºC. Then you box up the PC, and start working hard and impeding the cooling, and it's very easy to hit thermal runaway long before you hit 100ºC. There's no thermal cutouts outside processors these days.
The max ballpark figure of ~40ºC is a safer one to use. The max wattage should be 5V@150mA - 0.65W. If that gets hot enough to boil water (100ºC) something is seriously wrong.
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1 members found this post helpful.
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04-23-2021, 07:41 AM
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#24
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LQ Newbie
Registered: Apr 2021
Posts: 23
Original Poster
Rep: 
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Quote:
Originally Posted by business_kid
On maximum heat from a chip:
There are a number of thermal junctions in any chip which are best viewed as thermal resistances. It's also not the temperature you see now, but the worst case scenario that you have to calculate for.
Tj=150ºC is max in the wafer. Cooling from the legs of the chip can be ignored, because tracks are too thin to have much effect. So, at case=100ºC, your wafer will be ≥125ºC. Then you box up the PC, and start working hard and impeding the cooling, and it's very easy to hit thermal runaway long before you hit 100ºC. There's no thermal cutouts outside processors these days.
The max ballpark figure of ~40ºC is a safer one to use. The max wattage should be 5V@150mA - 0.65W. If that gets hot enough to boil water (100ºC) something is seriously wrong.
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There is no way that chip in my laptop will boil water, not even close.
Thank you for everything!
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04-23-2021, 08:37 AM
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#25
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LQ Guru
Registered: Jan 2006
Location: Ireland
Distribution: Slackware, Slarm64 & Android
Posts: 17,278
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Yep thx. I was dealing with something in post #20
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04-23-2021, 10:11 AM
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#26
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LQ Addict
Registered: Dec 2013
Posts: 19,872
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Quote:
Originally Posted by ondoho
The reading could still be from somewhere inside the chip; 100 deg. C could be well within spec, as I think somebody already pointed out in this thread.
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Obobskivich wrote this in post #8:
Quote:
Originally Posted by obobskivich
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04-23-2021, 01:29 PM
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#27
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LQ Guru
Registered: Jan 2006
Location: Ireland
Distribution: Slackware, Slarm64 & Android
Posts: 17,278
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The elevated operating temeratures are because there are three temperatures for ICs
Commercial = 0 to 70ºC
Industrial = -40 to +85ºC
Military = -55 to +125ºC
and needless to say, the higher your temp spec, the more you pay. In fact, no electronics will safely run at +125ºC, which is a ridiculous temperature, and everybody waters that down. They are thinking of a plane starting up in the morning in deepest Antarctica, flying to the Saudi Arabian desert, and baking in the sun all day. The manufacturer pretends they have tested at +125ºC and, I gather the militaries pretend to believe them.
In your pc (which was the question) use +≅40º. If it's uncomfortably hot for your finger, it's overheating.
What pilot is going to get into a plane/tank/warship at 125ºC and start doing stuff? Really?
Last edited by business_kid; 04-23-2021 at 01:34 PM.
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1 members found this post helpful.
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