Why is my laptop getting hot?

Question

Iron

I have a Samsung NP300V5A-S0B laptop. I bought it about 4 years ago, a year later I bought a cooling supply for it. I didn’t pay attention to the temperature before, but I remember that it was low (less than 50 degrees for sure).
Recently, it has become very hot, while surfing the web - on average, the temperature is kept at 80 degrees. At such moments, the cooler turns at maximum speed.
I didn’t do anything with this laptop - I cleaned it of dust, and changed the thermal paste (and not 1nu), and lubricated the cooler - it’s useless 0.
Maybe someone has any thoughts?
PS the temperature is high only on the CPU and motherboard indicators, but 2 HDDs show 32 and 38 degrees

Answer 1

Does the laptop feel warm to the touch? 80 degrees will be quite noticeable.
If the tactile temperature is not in the region of 80 degrees, then the temperature sensor is most likely to blame. It just shows the wrong temperature.
Try installing new firmware.

Answer 2

It is necessary to clean the radiator from dust. It is possible to replace the fan.
It is better if a specialist does it. If you'll do it yourself, do not forget to change the thermal paste.
Thermal paste must be applied in a very thin layer, 0.1-0.2 mm, you should not smear it like butter on bread.

Answer 3

1. cooling system pipes can fail - it is treated by replacing them.
2. If the video card is discrete, then it may fail (or just get very hot due to the launch into which it loads the video)