First, fault classification

    1 not only open the phone from the phone 's exterior view of its failure can be divided into three types :

    The first one is completely unable to work , including not boot after pressing the phone connected to the power supply switch, nothing happens .

 

 

    The second is not fully boot, press the power switch can detect the phone current, but no boot normally prompt : If the button lights, all bright lights display , the display character information display has switched the ringer after the beep , such as through self-test .

    The third is to boot, but there are some features malfunction , such as keys Fu Ling , the display is not normal ( character error, black screen , the characters do not know ) , silent, and so can not send words .

    (2) open the phone , view their fault movement from the phone , can be divided into three types : the charging and power supply failures portions failure, software failure , and send and receive paths.

    There are inextricably linked between these three types of faults , such as : mobile phone software failures affect the power supply section , phase-locked loop circuit transceiver channels , transmit power level control , send and receive paths , such as time- synchronization , and transceiver reference path crystal oscillator and provides the clock signal for mobile phones running the software to work .

  3 different nature of the fault can be divided into the following five types : that does not boot failure, no network failure, malfunction does not know the card does not display faults and other faults .

Second, the basic maintenance of the environment

1 first need is a quiet environment , do not be repaired in a noisy place ;

(2) In the table lay a piece of insulation from the effects of the thick black rubber sheet ;

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