CPU fan common faults

1. Poor rotation: This is a common problem with oil-containing bearings. The reason is that dust has entered the bearings and the lubricating fluid has lost its lubricating effect.
2. The noise suddenly becomes very loud: When encountering this problem, the first thing to think about is whether a blade of the fan is cracked.
3. The noise is very loud when the machine is turned on, and it becomes quiet after a while of rotation: This phenomenon is more common in winter. The reason is that the lubricating fluid is mixed with dust. The viscosity increases in the cold state. If it is not cleaned, adding lubricating oil can only make it feel better at the time, but it cannot solve the fundamental problem. The solution is to wipe off the original lubricating oil that is stuck with dust and add a few drops of clean oil again. Another situation is that the fan should be replaced.
What to do if the CPU fan does not rotate
Fault phenomenon: A newly configured assembled machine, everything is normal in normal use. It's just that in the motherboard BIOS, the CPU fan speed is reported as 0 rpm (revolutions/minute), while the actual operation of the fan is good.
Fault analysis: ATX-structured motherboards basically support the fan speed monitoring function. This allows us to understand the operation of the CPU fan in a timely manner without opening the chassis. The fault phenomenon in this case is obviously because the BIOS cannot detect the CPU's operating information and makes a false report. The reasons for the false alarm phenomenon are usually the following:
1. The power cord of the CPU fan is not plugged into the CPUFan (CPU fan) interface of the motherboard, but plugged into other fan interfaces. Although this plug does not affect the normal operation of the computer, the BIOS cannot monitor the operation of the CPU fan.
2. The power cord of the CPU fan is in poor contact with the corresponding interface on the motherboard. This situation is more common.
3. The CPU fan used is an unqualified product. Its motor has only two power cords, but no speed measuring wire in the middle, so the fan speed information cannot be fed back to the BIOS.
4. The motherboard and CPU fan of this machine have different electrical performance indicators of the speed measuring wire. As a result, the BIOS cannot obtain correct electrical information. However, this situation often leads to a large gap between the fan speed reported by the BIOS and the actual speed. Under the premise of determining that the first and second situations do not exist, the reported speed is generally not zero.
Troubleshooting: After analysis, we have a general understanding of the cause of the false alarm, so we can solve the problem more targeted. After inspection, it was found that the power cord of the CPU fan was plugged into the BAKFan (backup fan) interface. Plug it correctly into the CPUFan interface, and then monitor it in the BIOS. Everything is normal.
1. The CPU fan of the laptop does not rotate
Fault phenomenon: A laptop computer was found that the CPU fan did not rotate when the temperature of the back panel was very high. After inspection, it was found that the computer would rotate when it started the self-test, indicating that there was no problem with the fan braking. However, it still did not rotate when the temperature of the back panel was very high.
Solution: The CPU fan is mainly for CPU heat dissipation. It will only rotate to dissipate heat when the CPU temperature is higher than about 70℃. In addition, the problem of high back panel temperature is not necessarily caused by the CPU. The heat of accessories such as hard disk, memory, graphics card and motherboard may gather here, so the high back panel temperature is inevitably related to whether the CPU fan rotates. In addition, it is recommended to run large games at the same time for testing. If the CPU fan does not rotate after a period of time, it may be a problem with the CPU fan.