The power supply starts and the fan stops after only one turn

Hello:——1. The computer power supply is rectified, oscillated, pulse-width modulated, push-pull output, over-voltage protection, over-current protection, and short-circuit protection. and other basic unit circuits, it has high reliability.

Start the power supply, the fan only turns once and stops" means that there is a voltage output (fan voltage 12V), which has nothing to do with the "12V rectifier tube", in general, the fault cause is caused by the action of the protection circuit.

2. Because the protection circuit of the computer power supply is more complete and more complex, it is not easy to repair without high maintenance skills.

1.It is possible that the line contact is poor (especially some line fans, after pushing down, do not work, similar problems often occur, mainly because there is a power contact switch inside, which can be disassembled and directly linked, which can solve the problem).

2.It is possible that the shaft contact between the motor and the fan blade is not compact, causing the motor to run idle.

3.It is also possible that the shaft of the motor is rusty after being wet, causing the shaft to be inflexible. Disassemble it, sandpaper it, and add some butter.

4.It may also be that the capacitor has been used for too long and caused normal damage, so you can replace the capacitor, pay attention to the model and wiring direction.

Some workarounds.

When the fan is not running, press the key switch again, if the fan is running, the key switch is not in good contact. It can be solved by replacing the switch or adjusting the reed gap.

Another situation is similar, that is, the rotor is slowly stopped due to the lack of grease, and when there is vibration, the rotor gap is restored, and the fan runs again.

Specific determination method:

When the fan stops, unplug the power plug and turn the fan blades by hand, if you feel laborious, this is the problem. It can be solved by adding engine oil, etc.

In this case, there is a thermostat on the windings of the electric fan motor, and when the temperature of the winding coil reaches a certain height, the thermostat will automatically power off, and the electric fan will not rotate. When the temperature drops, the thermostat returns to the ON state, the power is turned on, and the fan turns again.

This situation shows that there is an inter-turn short circuit phenomenon inside the winding of the motor, and the winding current increases, the heat is hot, and it needs to be repaired.

1. If the shaft is not used for a long time or is not properly maintained, the shaft lacks oil, and it can be used to evenly spit the engine oil (lubricating oil, etc.) on the shaft position. The starting capacitor capacity becomes smaller, which is due to the fact that the fan has been used for a long time, resulting in insufficient motor starting torque, which requires the replacement of internal electrical components.

2. Capacitance problem: There is a starting capacitor in the fan, which is used to charge and discharge, and give the coil an instantaneous voltage to start the fan. If this one is broken, it will cause the fan to start slowly. Changing to an equal capacity or a large capacity can solve the problem.

Due to the hot weather, and the room space may be relatively small, especially for people who work outside and rent a small house, the fumes are not discharged when cooking, and the fumes enter the fan shaft and cause it to freeze. Disassemble it, put some oil on it, and then put it back together, which can generally be solved.

3. Or it is stuck due to rust caused by long-term non-use. If you don't have power, you can't turn it by hand. You can disassemble the rust and add some oil, and lubricate it. If the above 5 are not, if the coil is broken, it can generally only be replaced directly, and I am afraid that the price of repairing one is not only one.

I hope it can help you, remember to give it a thumbs up.

There are several reasons for this:

1.Sudden power outage.

2.There are places where the wiring of the electric fan is in poor contact, and after the fan rotates, the place with poor contact is disconnected due to vibration.

3.Something stuck the fan.

4.There is something wrong with the motor.

In general, this situation may be a problem with the power supply itself, but it does not rule out a problem with the motherboard.

Users can simply test to determine what the problem is.

It is recommended to follow the following steps for a simple test if possible:

1. You can unplug the power supply on the motherboard and hard disk, use the green wire and black wire to short-circuit the green wire and black wire, and observe whether the power supply fan continues to rotate. If the power supply fan continues to rotate, it is almost certain that the power supply is normal, and the motherboard is more likely to be faulty; If the power supply fan doesn't rotate continuously, it's almost certain that the power supply is faulty.

2. If it is basically determined that it is a power failure, you can use a normal power supply to replace the original power supply and test whether the computer can start.

If it can be started, it can be completely sure that the original power supply is faulty, and the power supply can be replaced; If it doesn't boot yet, there is a possibility that there is a fault on the motherboard that needs further testing or professional repair.

Answer: If you don't use it for a long time or don't maintain it properly, and the shaft lacks oil, you can use it to evenly apply oil (lubricating oil, etc.) on the shaft position. 2. The starting capacitor capacity becomes smaller, which is due to the fact that the fan has been used for a long time, resulting in insufficient starting torque of the motor, which requires the replacement of internal electrical components. 3. The motor is overheated.

Check whether the internal wiring of the fan is normal and replace the components.

1.Poor maintenance, chronic lack of lubricating oil. The fan shaft part is to ensure that there is lubricating oil, otherwise the fan blade on the motive cannot be dragged.

If you are at home, you can choose to turn off the power and then turn the fan blades, if the rotation is stiff, there is basically no lubricating oil.

2.Wear and tear caused by a long period of use. If a fan is used for a long time, the motor will wear out, and the shaft sleeve of the motor will easily burn out after wearing.

3.The fan does not rotate due to overheating. There is a motor in the fan device, and there will be an overheating circuit breaker in the motor, if there is a short circuit in the coil winding, the heat will increase in a short time, and the motor will "strike" in this case.

4.The capacitance of the starting capacitor is reduced. When the fan is used for a long time, the capacitance capacity will decrease, resulting in the starting torque of the motor becoming smaller, and the load cannot be driven.

It may be caused by a broken capacitor or a lack of lubrication in the motor or a poor contact somewhere, and the cause can be determined by a step-by-step inspection.

It is possible that the fan motor is aging.

Summary. Hello dear, press the power switch, and the fan stops after only one turn: this situation is generally due to a faulty motherboard (damage, short circuit, etc.) that causes the ATX power supply to protect itself and not work, or the power supply itself is faulty and cannot work.

Recommendation: In this case, it is best to replace and test with a normal power supply.

Press the power switch and the fan stops after only one turn?

Hello dear, press the power switch, and the fan stops after only one turn: this situation is generally due to the failure of the motherboard (damage to Hu Yun, short circuit, etc.) that causes the ATX power supply to self-protect, the group does not work, or the power supply itself is faulty and cannot work. Recommendations:

In this case, it is best to replace and test with a normal power supply.

You rock travel first power supply with tweezers short green 5V and black wire grounding, see if the power fan turns, if the ballast fiber turns, then this electric thick Kaiyuan is good, the problem is that the motherboard boot circuit is a problem. If it does not turn, then check the large filter capacitance of the power supply. <>

The power supply is normal. The Pioneer Computer version of the floor fan is automatically jumped without turning when you press it. What is the reason.

Hello dear, there is a high probability that there is a problem with the motherboard.

What happens if the capacitor is broken?

Hello dear, the capacitor is broken, and it is possible that the fan does not rotate.

First of all, turn the motor shaft or fan blade by hand without power to see if the rotation is flexible? If there is resistance to rotation, it means that the motor bearing is seriously worn or the lubricating oil is dry, and the new bearing should be replaced or lubricated to make it rotate flexibly without resistance. When installing the fixed motor, it is necessary to tighten the screws diagonally, and it must be tightened gradually, not in one step, and at the same time, it is necessary to hit the shaft back and forth with a wooden handle driver to ensure that the shaft is concentric with the bearings at both ends, so that the rotation will be flexible and without resistance after fastening.

If it turns flexibly without resistance, there are several reasons:

One is the problem of capacitance, which should be replaced with a new capacitor of the same capacity.

The second is that there is an inter-turn short-circuit fault in the coil, and the resistance value of the running winding and the starting winding can be measured with a multimeter to judge the quality of the winding. If the resistance value is not normal, it is better to use the new motor.

Dear friends, the reason why the fan stops when it turns on is that the power supply is insufficient. It is recommended to check the power supply quietly, or replace the power supply!

The second is that there is a problem with the interface of the CPU fan. This interface may be the interface with the motherboard, or it may be the wire and fan interface, if it is this problem, you can change the fan to test it, and you will know it by trying. If it's a problem with the fan itself, it's good to change the fan, if it's a problem with the motherboard's connection base, then it's a big problem, but before you make sure that there is a problem with the motherboard interface, you must first confirm that the fan you used for testing is good.

The third is the problem of the motherboard, and some boards are of poor quality, which leads to this kind of problem, or the aging of the board. Fourth, the fan shaft is aging, that is, it can't start normally, but it can be used with the help of external forces, which means that the fan is too worn, just change the fan.