What could be the reason for the sudden overestimation of the temperature readings of the 10th generation intel processor?

Question

Iron

Good day to all!

I am the owner of an MSI GF65 thin 10UE laptop with an i5-10200H processor and faced the following problem:

Suddenly, temperature jumps began and in general the temperatures increased significantly.
If earlier, including the OCCT stress test, the temperature gradually increased to about 70 degrees and remained at the same level, now when the stress test is started, the temperature instantly jumps from 45 to 80-85 (in half a second) and reaches 95 degrees. After stopping the test, the temperature also instantly drops to 45.

Previously, a temperature of 70 degrees could be achieved using undervolting (-120mV) and cooler settings. And now, in any case, the temperature is under a hundred, with undervolting or with a zeroed BIOS.

About a couple of months before the onset of these problems, I gave the laptop to notebook1 (Association of Service Centers) to service the cooling system and after that everything was ok. Given that I play once a week for a couple of hours, I doubt that the problem is dried thermal paste. Moreover, the temperature on the video card has not changed a single degree.

What I did:
- Reflashed the BIOS
- Installed the build of Windows with which there were definitely no such problems

According to my feelings, the temperature readings became strictly tied to the processor load, and not to the real readings of the temperature sensors.

What could be causing this malfunction? Could the temperature sensors in the processor be covered?

I still have one more idea, flash the very first BIOS version for this laptop - e16w2ims.103
But, I could not find it either on the official MSI website, or just anywhere on the Internet. Maybe someone has one?
I will be very grateful.

Answer 1

The problem was solved after I disassembled the laptop, changed the thermal paste and at the same time reset the CMOS battery and battery.
According to the state of the old thermal paste, I can say that it was fresh and in the right amount. The cooling system was well tightened.
In general, it still remains a mystery how the efficiency of the cooling system could be greatly reduced at once. A couple of my assumptions:
1) Due to some physical impact, the position of the cooling system relative to the processor has changed (but why then is everything ok with the temperatures of the video chip?
) .
I also swapped the RAM sticks :) Just in case, I also report this for the sake of completeness)