Why is Fan error in ThinkPad Lenovo's IBM notebook?

Http://pcweixiu.baike.com/article-11345.html

Fan error -- as the name implies, the fan is faulty and is handled according to the general fault standard, the solution to this problem is to directly replace the fan and the associated heat sink to solve the problem that the black screen Fan error does not enter the system. The main cause of this failure is that due to the air outlet, dust is easy to enter the heat dissipation system when not used, and even when used, because there is only one fan in the whole machine, it has to shoulder all the heat dissipation work, resulting in excessive dust concentration inside the fan, which increases the friction of the lubrication part inside the fan. Due to the increased resistance, and the instantaneous current is limited at startup, the power supply of the motor is insufficient, and the machine detects that the fan is not started, so an error is reported. Replacing the CPU cooling fan is a simple and direct solution, resulting in the emergence of a fan on IBM series machines.
Another root cause of the error is the temperature control chip on the motherboard. The so-called temperature control chip is used to control the fan running with the CPU graphics card temperature. If the temperature control chip has a problem, black screen Fan error will also occur when the boot does not enter the system, of course, in the real moment you can also press the ESC key to skip into the system, but in this case, the fan is not how high your CPU temperature is, the fan does not turn around, because you have skipped the IBM self-check process, so it is recommended that this problem occur, directly change the fan or graphics card chip, do not burn out the CPU because of small loss... Haha...

IBM
Fan

Solution:
First of all, this method requires some hands-on capabilities. It is recommended that you do not try it easily if you do not have sufficient disassembly experience. If you are in urgent need, I can tell you a simple temporary method, that is, to blow a breath to the heat sink (the position mentioned above), you should be able to start it.
This model of notebook is designed to be light and thin, so the heat dissipation adopts the form of a large heat sink and a fan. The heat sink covers the CPU and display card (the P series uses a long tube fan ), in addition to cooling the CPU, the fan directly emits heat from the air duct. Therefore, the fan has become the absolute core of the heat dissipation system.
To completely remove dust, the machine must be split. There are many specific disassembly methods on the Internet. Simply put, all the screws marked with the backend as 1, 2, 3, and 4 are removed, then, remove the keyboard and palm tray from the front one by one (there is a line between the keyboard and the palm to take off. Be careful not to break it off. If your palm tray is trackonly, it may not take off that line ).
There are a total of three or one screw on the CPU heat sink. After being screwed down, you cannot take it directly because there is glue on the Heat Sink of the video card part. It is best to use a single-field screwdrivers to slide gently. After taking it down, you can see that there is a lot of dust under the fan, first clear them. From the surface, the fan is fixed in the middle of two heat sink, and the heat sink seems to be connected with a rivet, so it is difficult to remove. In fact, it is not a rivet. It is just a very common clip. It can be opened with a single-word screwdriver or a thin blade with a little strength (Be sure to choose a better toughness, if the blade is instantly folded, it is very dangerous ). After the fan is removed, it can be seen that it is connected with the motor. In order to reduce the volume, the ball bearing design is not used, but a rod directly passes through the coil of the motor, so you can just click it to unload the fan page. Needless to say, the next job should be done to clean the invisible but gray places. It is best to put some lubricating oil on the drive shaft of the fan. Finally, load it back in order. This is the end. Note: When cleaning and installation is complete, you must apply thermal grease. Otherwise, a long period of time will lead to a crash or the machine will suddenly shut down.

(It is recommended that you do not smoke when using your computer, or your CPU cooling fan will soon break down, and the root cause of the failure is that the fan has been charging the smoke machine)