The laptop does not constantly blows the chip, and periodically turns on the signal from the temperature sensor. The sensor controls the transistor, which supplies power to the cooler. The voltage of the cooler is about 2-3V, depending on its model.

In the laptop brought for repair, the fan stopped rotating due to the failure of this key element. But if you look, there is no need to search for this transistor and solder it. Just turn off the positive terminal of the fan power connector and apply the necessary voltage directly to it.

The easiest way to take it from the USB connector. But since there is 5V, you need to reduce the voltage to 2-3V.

You can throw off extra volts in the simplest way - by soldering three diodes in succession. The voltage drop will be 0.7V x 3 = 2.1V. We take silicon diodes, since if we take germanium ones, the voltage drop will be only 0.2V per element. Do not forget about the permissible limit current of the diodes. It must be at least 0.5A, otherwise they may burn.

Another important point - you need to solder the diodes not only by turning off the laptop, but also by disconnecting the battery. The voltage on the USB connector can be maintained even when the system is turned off, and for some time after disconnecting the battery.

Diodes must be placed in an insulating tube so that they do not accidentally solder and short the power supply to motherboard.

Since then, the laptop works perfectly without both hangs and outages.

No car system will work normally if the temperature is not optimal. This is especially true of the motor, which works very actively, which is why it is very hot. In order to prevent the unit from overheating, a special cooling system is included in its design, which is responsible for heat removal. In the system there is such a device as a radiator, which moves the coolant.

Together with the machine is installed and the fan that drives the air. Naturally, the fan can fail from time to time. What are the typical faults of this fan? How to fix them? Let's understand all this.

Frequent malfunction of the radiator fan

If the cooling fan fails, sooner or later the power unit will overheat. That is why you need to carefully monitor the condition of the fan, and more precisely, its performance. If the fan is broken, then it is necessary to determine the cause of the breakdown as soon as possible and correct it.  Most often, a car radiator fan either doesn’t work at all, or runs continuously. We specify the manifestations of these problems.

In the first case, the fan can either not turn on at all, or simply not turn off. Despite the fact that there are only two problems, there are several reasons for their occurrence. You can check for yourself how efficient the fan is. To do this, just start the engine, without moving from the place.

  Wait a little while until the coolant warms to a temperature above optimal. When the temperature is sufficient, that is, it goes beyond the red line of the corresponding sensor, then the fan should turn on, which causes additional noise under the hood. But if the temperature arrow has already gone beyond the red mark, and the fan has not turned on, then immediately stop the engine, wait until it cools down, and then start searching for the causes of the breakdown.

To get started, look at the fan motor. To test, connect it directly to the battery, if the engine is a carburetor.  In cases with injection engines, the connector must be removed from the sensor, after which the fan should operate, and in emergency mode. If after connecting the fan does not turn on, you will have to buy a new one. But if he earned, then everything is fine with him, and you need to check not him, but, for example, a temperature sensor. Often, it is mounted in the radiator.

Disconnect it by unplugging the wires, and close it to each other. If at this moment the fan turns on, the sensor is broken and must be replaced. Check fan power wires for breaks. Be sure to inspect the fuse and the relay, which is responsible for the power supply to the fan.The fuse is responsible for sound signals, so to check its performance, just press the horn. Relay also need to check for sticking contacts. You should also check the operation of the device when voltage is applied to it. If the reaction is zero, then the relay needs to be changed. If you carefully inspect everything, you will surely determine what the problem is.

Now let's deal with the constant operation of the fan. One of the possible reasons for the constant operation of the cooling fan may be sticking of the relay contacts in the position in which the voltage is applied to the electric motor. Another such situation is possible when the thermostat is jammed in the position that corresponds to the movement of the fluid in a small circle. But this is possible only if there is no separate temperature sensor in the car, which is responsible for bringing the fan into action.

Then the fluid overheats, the fan turns on, but the coolant does not flow into the radiator. Fluid temperature will remain high, although the fan will operate. Another thermostat can jam in the intermediate position, that is, the liquid will go to the radiator, but due to partial opening completely into the radiator does not fall, that is, it does not completely cool. Nevertheless, if the fan runs continuously, then it is not as scary as its non-functioning. Therefore, you need to know exactly what to do if a breakdown of the unit is detected.

How to troubleshoot a radiator fan

Before removing the fan, disconnect the ground terminal from the car battery along with all the wires that go to the fan.Only then can the fan be removed. In order not to break, and the cooling process proceeded more efficiently, experts recommend cleaning the fan from time to time, removing any contamination. For cleaning you need to use a brush.

It so happens that the fan breaks down because of ordinary dirt. In order to check whether this is so, bend the engine casing and assess the condition of the equipment.As practice shows, it is necessary to buy new brushes, because they often break because of too much dirt and premature wear.

  Quite often the fan breaks down due to bad contacts. This phenomenon is characteristic of oxidized contacts, if you have never cleaned them. Therefore, before checking the fan, check the wires, if necessary, replace it.

The next step is to check the performance of the rotor, its windings. In the event of a break or a closure, it will be necessary to inspect each turn in order to determine the failure. Clean the winding in advance with a brush on metal and a cloth soaked in solvent. It is forbidden to use products that contain aggressive elements.

If you have determined that the electric motor is broken, then you will have to buy a new device. If you are on the road, the engine temperature has become critical, and the radiator does not turn on, then first you need to stop the car, and then wait until the engine cools down. Then you can try the following:

1)   Gain speed more than 60 km / h, so the liquid will be cooled by oncoming air flows;

2)   Close the wires that go to the sensor to forcibly turn on the fan;

3)   Turn on the heating system of the car at full capacity, so some of the liquid heat will go to the salon.

Other radiator faults

It happens that the radiator fan turns on ahead of time. The temperature sensor is to blame. Often, he incorrectly determines the temperature, why not at the right time sends a signal to the fan.

  In this matter, you need to choose the right sensor. They are of two types - summer  and winter, moreover, their temperature conditions are different.  For example, the winter sensor will work later, and the summer one - earlier. If you choose the wrong device, then do not be surprised that the fan in your car will turn on either sooner or later than necessary. The sensor can work correctly, but the temperature range of the device is not suitable.

Many motorists underestimate how important and useful is the car's radiator fan. If you do not pay attention to the damage, you risk paying a decent amount for repairing an overheated engine. That is why it is necessary to diagnose a fan problem in time and fix it as soon as possible.

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Instruction

Download SpeedFan. Install it and run the speedfan.exe file. First, change the program language. Click the Configure button. In the window that opens, select the Options tab. Now in the item Language set the parameter Russian. Click OK.

Now re-open the main menu of the program. The central part of the window will show the status of the fans and the temperature of the devices to which they are attached. If the temperature of the equipment has exceeded the permissible rate, then the “fire” icon will be located next to its name.

At the bottom of the window, find the fan you need and increase the speed of rotation of its blades by pressing the “Up” button several times. Make sure that the temperature of the desired equipment has dropped to the normal mark.

If this does not happen, then clean the cooler mechanically. Turn off the laptop and disassemble it. To do this, unscrew a few screws and detach the bottom cover of the laptop. Be extremely careful, because, in most cases, several cables are attached to it, coming from the motherboard. Be sure to remember the connectors to which these cables were attached.

Unscrew the screws that press the desired fan to the device. Disconnect the power from the fan by disconnecting the appropriate cable. Now soak a cotton pad in a weak alcohol solution and wipe the fan blades with it. If the cooler is too small, use cotton buds. Completely clean blades from dust.

Install the cooler in the socket and screw it. Assemble the laptop by firmly attaching the cables and tightening all the screws. Turn on your mobile computer. After the download is complete operating system  Run the program SpeedFan. Make sure that the cooler is working properly, and the temperature of the equipment does not exceed the permissible standards.

Sources:

• how does a laptop fan work

Tip 2: How to check the performance of the motherboard

To perform the verification, you must have a working power supply and a working processor.

Instruction

First you need to look for visible defects on the motherboard. Check all condensers for swelling. Basically, they become the cause of the inoperability of the motherboard. If during the inspection you find swollen capacitors, then you need to replace the board because it will not work stably for sure.

Reset the CMOC. The jumper is located next to the battery on the motherboard and is labeled CCMOS or CLR_CMOS. It contains three contacts, where the first and second are closed in standard mode. To reset the settings, close the second and third contacts for a few seconds, then return the jumper to its previous position.

Unplug the power supply. Disconnect all cables from the system board, leave only power. Also disconnect all devices from it. Remove the RAM and all the boards from the slots. Only the processor should remain installed in it. Turn on the power supply. Start the computer. The speaker should emit a signal about the malfunction of the RAM. If the signal is emitted, the motherboard is most likely in good condition, and if there is no sound, then the board is inoperative and must be replaced.

Unplug the power supply. Install the memory module in the first slot. Reconnect the unit to the network and start the computer in the same way as in the second paragraph. The speaker should emit a video card error. If there is a signal, the motherboard is operational.

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• how to be workable

The main problem of some notebook models is the poor quality of the cooling system. This is usually due to the fact that the fans operate at 30-50% of their maximum power.

Instruction

Most often, laptop coolers do not work at full capacity. This is because the system saves battery power by spending it on more important devices. If you think that the temperature of certain equipment exceeds the norm, then independently increase the speed of rotation of the blades. Install the program SpeedFan. Run this application.

First, study the temperature readings. Find a device whose temperature exceeds acceptable limits. Press the up arrow several times opposite the name of the cooler installed on this equipment. Wait for the temperature to be set to a stable speed for the cooler blades. Minimize the program window, but do not close it.

If using this utility you can not change the parameters of the fans, then use the AMD OverDrive. It is better to use it when working with a laptop that has an AMD processor installed. After loading the main program menu, go to the Fan Control item located in the Performance Control submenu. Move the sliders, located under the graphic images of all coolers, setting the values ​​to 100%. Click the Apply button to apply the settings.

Click the Preferences button and select Settings. In the menu that opens, activate the Apply my last settings item by checking the box next to it. It is necessary that the program automatically loads the specified settings after turning on the laptop. Click OK and close the OverDrive program.

If you are using a laptop with an Intel processor, then use the Riva Tuner program to adjust the rotational speeds of the blades of the coolers. Perform similar operations, increasing the fan speed to the desired values. Remember that during intensive work, these devices consume a lot of energy.