Motherboard failure is often manifested as the system startup failure, the screen is not displayed, sometimes can start and sometimes can not start and other difficult to intuitively judge the fault phenomenon. When inspecting and repairing the fault of the motherboard, the maintenance principle of "one look, two listen, three smell and four touch" is generally adopted. It is to observe the fault phenomenon, listen to the alarm, smell whether there is an odor, and touch some parts with your hand whether they are hot. The following is a list of several common motherboard maintenance methods, each method has its own advantages and limitations, generally to use a combination of several methods.
Cleaning method
This method is generally used to solve the problem that the motherboard cannot work properly due to too much dust on the motherboard, and the dust can be removed by brush on the motherboard. In addition, the motherboard is generally connected to a lot of external board cards, the gold finger part of these boards may be oxidized, resulting in poor contact with the motherboard, this problem can be eraser to erase the surface of the oxide layer.
Observation method
The main use of "look, touch" skills. In the case of power off, see whether the parts are correctly connected, whether the capacitor and resistance pins are in good contact, whether the surface of each part is burnt and cracked, and whether the copper foil on each circuit board has traces of burning. At the same time, you can touch the surface of some chips with your hand to see if there is a very hot phenomenon.
Substitution method
When some fault phenomena are not sure which part is caused, the suspected part can be replaced to eliminate the fault. You can take the suspected parts to the good computer to try, and you can also connect the good parts to the faulty computer to try. For example, if the internal self-check times are wrong or the capacity is wrong, you can use this method to determine the real culprit causing the fault.
Software diagnostic method
Here we generally refer to testing through a diagnostic program or system test software that comes with it. Generally used to check various interface circuit faults.