5 after the first power load

  Power system is the machine's energy supply center , the vast majority of the load failure is often caused by the power supply is not smooth . Therefore, when seized find fault , you should first check the power supply circuit , make sure the power supply is no exception , and then check each function of the circuit. If you do not network, does not know the card and does not show a fault , a large part of the reason is due to the normal power supply is not caused .

6 After briefly complex

  Maintenance Practice has proved that a single cause or a simple situation which causes the vast majority of failures , while at the same time the situation is caused by several reasons or complex causes of failure is much less. Therefore, when after receiving the machine to be repaired , the first to detect those failures may lead to the most direct and simple cause of the malfunction , the vast majority was able to identify the cause of this failure after treatment , when the above steps have yet to find the point of failure , indicating that the fault is issued by a number of more complex or other causes , but this situation is not much maintenance encountered . For example , when we do not repair the phone network failure, you should first check the antenna contact is good , the presence or absence of each filter Weld, RF power supply is normal and other simple reason , and not first consider the peripheral components within the engine manifold , or whether damage and other complex reasons. Otherwise, the simple failure complicated, not only for troubleshooting , but also cause permanent damage to the motherboard.

Sixth, mobile phone repair process

    Phone circuit is more complex, very fine line printing , integrated circuits using surface mount circuit mostly digital circuits , and the relationship between them is quite complex , it brought a certain degree of difficulty to maintenance work , make phone repaired, in addition to master beyond its basic principles and proper maintenance of tools , but also pay attention to the maintenance of reasonable steps to make maintenance work in an orderly manner . When servicing mobile phones, according to the following steps to repair :

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