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Heat Sensor Faulty

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My laptop have been facing heat issue for the past couple of months. It already lasted me 3 years plus. Recently my laptop instant power down due to CPU heat reaching 105 degree Celsius. I tear the laptop apart since there is no more warranty, I notice it is using two PWM fans. I manually cut off the wire which control the fan speed for both fan so that both fan will run at its maximum speed. This produce a very loud and annoying noise. The main question is, when the fan is function at PWM mode and give that the CPU already reaches 100 degree Celsius, the fans should be running at maximum speed(same speed when I cut off the signal wire) but it is running at a lower speed(Based on the sound produce by the fans).

EDIT: I have also apply AS5 for both the GPU and CPU.