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Anonymous users2024-02-08How to check for hardware failures.
For the soft fault of the computer, it can be solved by analyzing the fault phenomenon, reinstalling the system, replacing the software, modifying the software program, or removing the computer virus. For hard faults, it is necessary to check and eliminate them step by step according to the inspection principle, and the following ten inspection and judgment methods for hard faults are introduced
1.Plugging and unplugging method.
The "plug-in method" is a method of "unplugging" or "plugging" a plug-in to look for faults. For example, if the machine has a "deadlock" phenomenon, this method is used to pull out the plug-in board piece by piece, and if the machine returns to normal, it means that the fault is on the board.
2.Substitution method.
The "replacement method" is to replace the suspected problematic device with the one that has been determined to be the best, and gradually narrow down the search.
3.Comparative Law.
The "comparison method" is to compare the correct characteristics (waveform or voltage) with the characteristics (waveform or voltage) of the faulty machine to see which component's waveform or voltage does not match, and measure it pole-by-pole according to the logic circuit diagram, so that the signal is detected point by point in the direction of the source pursued, and the fault location is determined after analysis.
4.Measurement method.
The "measurement method", also known as the "static measurement method", is an effective method to try to suspend the computer in a specific state, measure the level of each point required with a multimeter according to the logic diagram, and analyze and judge the fault.
5.Heating method.
The "heating method" is a method to artificially raise the ambient temperature and accelerate the "death" of some components with poor high temperature parameters to find faults.
6.Percussion.
The operation of the machine is good or bad, which may be caused by the false soldering or poor contact of the pins of the components and components, or the increase of the resistance of the metal through hole. In this case, it is much easier to use the percussion method to check the circuit board by gently tapping the board with a rubber hammer and then checking it again.
7.Partition method.
The segmentation method is a method of "splitting" the fault, gradually shrinking the board, narrowing it to a certain line, and then to a certain point.
8.Direct observation.
The true observation method is to use human senses to directly observe sparks, abnormal sounds, overheating, scorching and other phenomena to determine the power supply short circuit, overcurrent, overvoltage, loose plug-ins, corrosion damage and other obvious faults.
9.Isolated compression method.
That is, according to the phenomenon of the fault and the hardware parts, some information about the relevant parts is temporarily disconnected or the original data is simplified to reduce the search range.
10.Procedural testing method.
That is, the use of boot self-test program, advanced special diagnostic program to help find the cause of the fault, the diagnostic program in the form of a menu to provide a number of hard drive, floppy drive, CD-ROM, printer and other detection, if the hardware failure, the display of error, sound to obtain the fault point and its cause.
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