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Motherboard failures are often manifested as failures of system startup, screen display, sometimes startup and sometimes not startup, which are difficult to intuitively judge. When checking and repairing the main board's faults, the maintenance principles of "one look, two listen, three smell and four touch" are generally adopted. It is to observe the fault phenomenon, listen to the alarm sound, smell whether there is a smell, touch some parts with your hands whether they are hot, etc. The following list of several common motherboard maintenance methods, each method has its own advantages and limitations, generally several methods combined to use.

Cleaning method

This method is generally used to solve the problem that the motherboard can not work properly because of too much dust on the motherboard and the static electricity in the dust belt. The dust on the motherboard can be removed with a brush. In addition, the motherboard is usually connected with many external boards. The golden finger parts of these boards may be oxidized, resulting in poor contact with the motherboard. This problem can be erased with rubber to remove the oxide layer on the surface.

Observation

Mainly used in "see, touch" skills. In the case of switching off the power supply, see whether the components are connected correctly, whether the capacitor and resistance pins are in good contact, whether the surface of each component is charred or cracked, and whether the copper foil on each circuit board is burnt out. At the same time, you can touch the surface of some chips by hand to see if there is a very hot phenomenon.

Substitution

When it is impossible to determine which component is responsible for some failure phenomena, the suspected component can be removed by replacement method. The suspected parts can be taken to a good computer to try, and the good parts can also be connected to a malfunctioning computer to try. For example, if the memory is incorrect in self-checking or the capacity is incorrect, this method can be used to judge the real culprit of the failure.

Software diagnostics

Here we generally refer to testing by random attached diagnostic programs or system testing software. It is generally used to check the faults of various interface circuits.