Recently, the author in the use of the computer DELL Latitude C640 Laptop cpu fan, the machine frequent a blue warning window and then crash. I analyse the reason of failures: because warning content for the garbled, before failure and just installed a downloaded from the Internet software, so the software is suspected carry the virus, then delete the software installed and used KV3000, rising 2001 and other antivirus software to checked, kill operation, all did not discover the virus. Off and restart, about 5 minutes, again the above phenomenon, repeated several times this is still true.
In order to eliminate the virus may, format hard disk, reinstall Windows, will complete the installation, the above phenomenon to appear, make the installation work to complete. I in closely studied after feeling the fault is not like caused by viruses, because every time the machine to boot, just start the job when normal, only in a few minutes later just appear crash phenomenon, that seems like some of the hardware and the machine, especially about the CPU DELL Latitude d820 Laptop cpu fan temperature. Shutdown, open check mainframe box, when touch to the CPU heat dissipation yet a little while, feel very hot, obviously this is not normal, doubt is the CPU chip or fan has a problem. In the case of cover open start machine, found that CPU fan speed is slow, has lost the normal cooling function. Shutdown, the fan will be removed, with the hand, turn the door, feel the rotation of the leaf fan is not flexible, so use small screwdriver insert door at the bottom of the leaf in aperture, and slowly up the broken open, will the fan blade and fan a separate, then turn over the door leaf, see the central place of leaves in the door, in a small arc several magnet surrounded the round cover form the firmware, apparently this is the fan motor rotor and stator is fixed together with door leaf of a miniature winding, if the fan blade and fan a combination is together, the miniature winding just in the interior of the rotor could plug. Further observation found that, in the top of the shaft of the stator and the rotor and connect the bearing parts sticks has some dry black sludge, with gauze will erase clean the respectively, and the point in several drops lubricating oil, then will fan blade and fan a new combination of together, at this time, it gently moving fan can easily turn leaves.
To use the fan installed to CPU DELL Latitude e6400 Laptop cpu fan heat sink, electricity after 10 minutes, then touch CPU heat sink, the feeling in the hot temperature only state that the cooling fan function had been restored. Cover the chassis, restart and reinstall Windows system, everything is normal, long time continuous operation, this problem does not appear again.
This failure is due to the CPU fan DELL Studio 1555 Laptop cpu fan lubrication is bad, make fan leaves turn resistance increases, door leaf to speed slow and lose heat function, so as to make a few minutes at boot CPU for the temperature too high into the protection of state there the phenomenon of the crash.
The above is I'm on the computer problems and is the small CPU fan DELL Vostro 3700 Laptop cpu fan of the cause, hope everyone in the machine when after failure might as well also consider the problems caused by the fan.
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