What is a CPU Fan?

The CPU fan is also called a cooling fan. It is a fan used to cool the CPU. It is provided to the radiator and the chassis. It uses them to quickly conduct the heat of the CPU and blow it into the nearby air to cool down . The cooling effect is directly related to the quality of the CPU cooling fan and heat sink.

CPU fan

The CPU fan is also called a cooling fan. It is a fan used to cool the CPU. It is provided to the radiator and the chassis. It uses them to quickly conduct the heat of the CPU and blow it into the nearby air to cool down . The cooling effect is directly related to the quality of the CPU cooling fan and heat sink.

There are many types of CPU fans depending on the installation size, bearing type, and number of blades.

Chinese name

CPU fan

Foreign name

CPU Fan

Principle

Conducts heat from the CPU to the air

Make up

Speaking of CPU fans, in fact, they are used to quickly conduct the heat of the CPU and blow them into the surrounding air. The cooling effect is directly related to the quality of the CPU cooling fan and heat sink, so how to choose a suitable one CPU fans have become a topic we are very concerned about. But because the market is full of

The main performance of the fan is reflected from the following aspects:

1.Using cooling software will definitely reduce CPU temperature

Analyzing from the working principle of the cooling software, the cooling software can use the HLT instruction to put the CPU into a "sleep" state. Using them should reduce the CPU temperature. If we run other cooling programs in these operating systems at this time, these Many automatic cooling programs will interfere with each other, causing the system to fail to call the HLT instruction to control the CPU to sleep, which will destroy the cooling effect of the operating system itself and even cause the CPU temperature to rise straight after the system uses the cooling software. Therefore, the claim that the use of cooling software will definitely reduce the CPU temperature is incorrect.

2. The larger the fan power, the better the heat dissipation effect.

Theoretically, the larger the fan power, the better the heat dissipation effect, but such a theory is established under a certain premise, that is, the larger the power is, under the condition that the fan's operating power does not exceed the rated operating power The fan is usually the stronger the wind, the better the heat dissipation effect. The power of the fan is directly related to the speed of the fan, which means that the higher the speed of the fan, the stronger and more powerful the fan is. When choosing a CPU fan, our users must not mistakenly believe that the fan power is large and the heat dissipation effect will be better. Instead, they should choose the fan that matches their computer according to the principle of sufficient power.

3.The running effect of the cooling fan has nothing to do with the ambient temperature

Because the CPU cooling fan often works in an indoor environment, and the indoor temperature just ensures that the cooling fan can run smoothly at high speed, many people take it for granted that the operating effect of the cooling fan has nothing to do with the ambient temperature. The computer has not been run in an environment with severe conditions and low temperatures. In addition to paying attention to the temperature of the use environment, we also need to fill the fan with antifreeze lubricant to ensure that the CPU cooling fan can also operate normally at low temperatures.

4. If the cooling fan is installed in the wrong direction, the fan cannot rotate.

Have you reversed the clip of the cooling fan? Of course, no one wants to try to install your own cooling fan upside down, but not afraid of 10,000, just in case, if you accidentally install the cooling fan upside down, can the fan turn? Many people will say that if they are reversed, they will definitely not be able to turn around. In fact, this view is wrong. From the actual operation point of view, even if the clip of the cooling fan is reversely installed, the fan can run, but this operation cannot achieve cooling Effect, and the rotation time does not take long, it will cause the system CPU temperature to rise, so the CPU temperature monitoring component on the motherboard will work, after the CPU is down, it will be prone to frequent crashes and

1: remove the fan;

1. Rotation failure: This is a common problem with oil-bearing bearings. The reason is that the bearings have been dusted and the lubricating fluid has lost its lubricating effect.

2. The noise suddenly becomes very loud: When encountering this kind of problem, the first thing to think about is whether a fan has cracked a certain blade.

3. It is very noisy when turning on the machine, it will be quiet after turning for a while: this phenomenon is more common in winter. The reason is that the lubricant is mixed with dust. In the cold state, the viscosity becomes large and there is no cleaning. Adding lubricating oil can only feel better at the time, but it cannot solve the fundamental problem. The solution is to wipe off the original dust. Lubricating oil, just a few drops of clean. Another situation is that the fan should be replaced.

What to do if the CPU fan does not turn

Symptom: A newly configured assembly machine is usually used normally. However, in the motherboard BIOS, the CPU fan speed is reported as 0 rpm (revolutions per minute), but the actual operation of the fan is good.

Failure analysis: ATX-based motherboards basically support fan speed monitoring. This allows us to keep abreast of the operation of the CPU fan without opening the case. The failure phenomenon in this example is obviously because the BIOS could not monitor the operation information of the CPU and made a false report. There are several reasons for false positives:

1. The power cable of the CPU fan is not plugged into the CPUFan (CPU fan) connector on the motherboard, but plugged into another fan connector. Although this connection does not affect the normal operation of the computer, the BIOS cannot detect the operation of the CPU fan.

2. The power cable 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, and there is no middle speed measurement wire, so it is impossible to feed back fan speed information to the BIOS.

4. There is a difference between the main board and the CPU fan in the electrical performance indicators of the speed measurement wire. As a result, the BIOS cannot obtain correct electrical information. However, this situation often results in a large gap between the fan speed reported by the BIOS and the actual speed. Under the premise of confirming that the first and second cases do not exist, the situation of reporting the rotation speed to zero will generally not occur.

Troubleshooting: After analysis, we have a general understanding of the causes of false positives, so that we can target the problem. After inspection, it was found that the power cord of the CPU fan was plugged into the BAKFan (spare fan) connector. Plug it into the CPUFan interface correctly, and then monitor it in the BIOS, everything is normal.

1.The CPU fan of the laptop does not turn on

Symptom: A laptop computer found that the CPU fan does not turn when the computer runs to a high temperature on the back panel. After inspection, it is found that the computer will turn once when the self-test is started, indicating that the fan has no problem in braking. However, the rear panel still does not turn even when the temperature is high.

Treatment method: The CPU fan mainly dissipates heat for the CPU. Only when the temperature of the CPU is higher than about 70 ° C, the CPU fan rotates to dissipate heat. In addition, the problem of excessive temperature on the rear panel is not necessarily caused by the CPU. The heat of hard disks, memory, graphics cards, and motherboard accessories may be collected here, so the excessive temperature of the rear panel is necessarily related to whether the CPU fan is spinning. In addition, it is recommended to run large games for testing at the same time. If the CPU fan does not turn after a period of time, it may be a problem with the CPU fan.

2, the CPU fan is not installed properly, causing frequent crashes

Symptom: As long as an IBM T42 notebook computer is started, it will run slowly for a period of time, and it will crash for no reason and restart automatically.

Treatment method: Due to the high noise of the CPU fan, the CPU fan of this notebook computer has been disassembled and cleaned before, so it is determined that it may be a problem with the CPU fan, which causes the CPU temperature to be too high and a problem. The original removal is T42. The screws of the CPU fan were not installed properly, and the fault did not occur after reinstallation.

3, CPU cooling air duct blocked due to shutdown failure

Symptom: After working for more than an hour, the machine suddenly shuts down. After a while, it can be turned on again, but after a while, it stops.

Handling method: Since the hardware system can be turned on to indicate that there is no problem, the reason for this is probably due to the high temperature of the CPU, and the protection function is automatically turned on to stop the machine. So we disassemble the notebook computer for inspection. If there is no problem with the CPU fan, and then disassemble the cooling air duct, it will be found that the air duct is blocked by some flocculent objects. After cleaning, the notebook computer can be restored to solve the problem.

4. The CPU fan stops and causes a crash.

Symptom: The CPU fan of the notebook computer sometimes stops, causing the CPU temperature to be too high and causing crashes.

Processing method: The mobile CPU basically has a temperature protection function. When the temperature of the CPU exceeds a certain limit, it will freeze or restart to protect the CPU. If there is a problem with the CPU fan, it should be repaired as soon as possible to eliminate the fault and ensure that the fan runs normally.

5.The CPU fan of the notebook computer sometimes turns and sometimes stops

Symptom: A friend's Toshiba M2 notebook computer, after using it for a period of time, found that the CPU fan sometimes turns and sometimes does not turn, but the body temperature has always been high.

Treatment method: The fan of the notebook computer is designed with temperature control. Generally, the CPU will only rotate when the CPU temperature is higher than 70 ° C. The high body temperature does not mean that the internal temperature is really high, so this problem is not very large. ^[1]