[SOLVED] Heatsink is very hot but the exhaust air is cold ?

[javarawr]

Hi, so i just repasted my laptop thermal paste today
i use arctic mx-4 to replace the laptop thermal paste
it seems to be going well at first since my laptop thermal paste has dried up which has made my laptop fan sounds so loud
but after i check the temp it is even worse than before and the fan is even louder than before
when i touch the heatsink it is very hot like 80c
but when i put my hand next to the exhaust it seems that the air is actually 30c like if it didn't even cool anything down
any suggestion? should i repaste?

laptop spec:

• 16gb 2x8 2666mhz
• i5-10210u
• mx130
• wd sn520

some image:

https://imgur.com/PaaYzHG

View: https://imgur.com/PaaYzHG

 

[rgd1101]

how do you touch the heatsink? you have to laptop open and turn it on?

 

[javarawr]

how do you touch the heatsink? you have to laptop open and turn it on?

I open the laptop 180 degrees with keyboard and screen facing the table with the back cover open while benching with furmark and i monitor the temp with external monitor
Also, It seems that the temperature after repasting are worse

 

[geofelt]

Is your cpu cooler fan running?

 

[Barty1884]

when i touch the heatsink it is very hot like 80c

Human perception of temperature doesn't work like that.
60'C would cause second-degree burns in a couple of seconds, 80'C would be instant.


Do you have an A vs B screenshot? Temperature is only one factor. I had a similar issue when I repasted an i7-1065G7 at first glance, but what I realized in comparing the screenshots was it was clocking higher, with more voltage and the same/marginally higher temperate.

If you don't have a screenshot for the same scenario prior, it's going to be pure guesswork.

 

[javarawr]

Is your cpu cooler fan running?

Yea, It running and sounded like a jet engine

Human perception of temperature doesn't work like that.
60'C would cause second-degree burns in a couple of seconds, 80'C would be instant.


Do you have an A vs B screenshot? Temperature is only one factor. I had a similar issue when I repasted an i7-1065G7 at first glance, but what I realized in comparing the screenshots was it was clocking higher, with more voltage and the same/marginally higher temperate.

If you don't have a screenshot for the same scenario prior, it's going to be pure guesswork.

Unfortunately, I don't screenshot the temps before repasting since i thought that it will be going well

 

[geofelt]

I would try to repaste.
Warm up the cpu a bit first which softens the paste and makes it easier to remove the cooler.
Look at the pattern of the surfaces.
If paste overflowed, you used too much paste.
The objective is only to fill in microscopic air pits.
Air is a poor conductor of heat.
Paste is better, but not as good as metal to metal contact.
Try to use as little paste as you can.
A small drop in the center will spread under heat and pressure.

 

[Paperdoc]

Right, re-pasting may be a good idea, but FIRST find out HOW to do that. Especiailly how much paste to apply. More is NOT better! You need just the right amount to produce a very THIN film of heat transfer paste. A thick layer is an insulator that slows down heat transfer.

ALSO check the air flow path of the fan. I have seen laptops with enough dust collected in the air flow channel to effectively block it so very little air actually flows through to cool, even though the fan is running full speed.

 

[CountMike]

Hot cooler body indicates good heat transfer from CPU/element/chip but taken with cool exhaust air it indicates not enough air, maybe obstructed air passage etc,

 

[javarawr]

Right, re-pasting may be a good idea, but FIRST find out HOW to do that. Especiailly how much paste to apply. More is NOT better! You need just the right amount to produce a very THIN film of heat transfer paste. A thick layer is an insulator that slows down heat transfer.

ALSO check the air flow path of the fan. I have seen laptops with enough dust collected in the air flow channel to effectively block it so very little air actually flows through to cool, even though the fan is running full speed.

I have checked the paste again and I just realize that I forget to clean the stock thermal paste with alcohol.
I have done repasting it again and it is cooler. Problem solved. Thanks.

 

[Paperdoc]

Good to know - thamks for that update. And thanks for Best Solution.