Thinkpad: Well it seems dust isn’t the issue with my CPU running hot.

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Oct. 3, 2022, 2:03 a.m.

Well it seems dust isn’t the issue with my CPU running hot.

Any thoughts what else it could be?

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Replies
13
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Oct. 3, 2022, 2:03 a.m.

Thermal paste is old and dry

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Oct. 3, 2022, 2:03 a.m.

This is the problem

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Oct. 3, 2022, 2:03 a.m.

If fan not broken try re-paste, better with good reputation thermal paste.
And make sure you dont blok air vents

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Oct. 3, 2022, 2:03 a.m.

Also put on tpfancontrol. You can set what temps come on at what level. If the fan is running full blast and it’s clean and vents are not blocked, probably the paste.

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Oct. 3, 2022, 2:03 a.m.

is right - reapply thermal paste

how do I remove without causing damage?


70 to 90% ETOH.
Wait for a couple of seconds to dry tyen reapply thermal paste

I'd use an alcohol wipe

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Oct. 3, 2022, 2:03 a.m.

.

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Oct. 3, 2022, 2:03 a.m.

Can you give more details?

sure it the cores all reach about 100 and laptop shuts itself down.

Would be amazing if you can provide logs or screenshots on the temps or task manager performance.

I see, it's pretty clear that it is a kernel failure right there. We have the same CPU, just to confirm do you experience and struggle with lag in the system? I can see that your CPU speed is so low.

it doesn’t seem to but I don’t do anything very intensive…

It might be the cost of throttling issues. Have you updated your Bios lately?

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Oct. 3, 2022, 2:03 a.m.

Does fan spin ? , Have you reapplied thermal paste. Are you blocking the air vents

I will be applying paste. Have not yet! I don’t believe I’m blocking the vents.

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Oct. 3, 2022, 2:03 a.m.

Remove old thermal paste and reapply new one

You do not need to put any on the smaller cpu die, that's the PCH and it should not be connected with the heatsink. Lenovo did not put any tim there originally, but this won't hurt anything

Also if your thermal issues are very bad replace the heatsink with dGPU heatsing. It has 2 heat pipes

sorry you’re saying Lenovo didn’t put any there but it appears there is some?

is this a brand new laptop or a used/refurbished one? My T480 was a later revision, bought brand new from them and it had no thermal paste on the smaller PCH chip.

either way. if you are not using usb-c alt mode dock, not putting thermal paste on the smaller chip is better.

The thing is, the PCH normally stays at around 50°C when the CPU can reach temps of ~95°C on this machine. If you have thermal paste on the PCH, you basically connect the hot heatsink with cold chip, thus increasing it's temperatures

good info. This was an off lease laptop bought from a business I believe.

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Oct. 3, 2022, 2:03 a.m.

Not sure whether or not that large metal part (not sure what it is - an SSD mount or heatsink?) could also be conducting heat. Might pay to stick some thermal pads down.

I'd move that sticker though between the RAM slots. That's a bad location for it

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Oct. 3, 2022, 2:03 a.m.

go to Windows energy power management and set the CPU performance at 90 percent or less and try again

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Oct. 3, 2022, 2:03 a.m.

Had this before and it was a main board fault unfortunately, cpu VRM we’re playing up

what did you do?

replace the board

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Oct. 3, 2022, 2:03 a.m.

It could be Windows itself. My T460 is cooler when Linux is Running.




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