3 tips to master the correct disassembly

    Because of the phone's casing is generally thin-walled PC-ABS plastic , its limited strength , coupled with the mobile phone casing mechanical structure is different, there is the use of screws , the snap , snap outside structure , so for phones installation and removal , maintenance staff must be cautious, look in advance , based on the mechanical structure to figure out , and then disassemble , or vulnerable to damage the case.

Removal and installation of the phone is a mobile phone repair basic skills , and some phones are easy to dismantle and easy to install , such as Ericsson 788, T18 and other mobile phone . But there are a lot of mobile phones, especially some of the new phone, if unable to master the trick disassembly is very easy to dismantle bad.

4 . Observed Symptom

    After you open the lid , you should first make a visual inspection of the circuit board . Check the cable for loose and broken, whether the Weld and disconnected components , each of the contacts for damage and corrosion before energizing check, observation , and Symptom make a record.

5 . Determine fault coverage

    According to the symptoms , determine possible causes of malfunction , roughly delineated the scope of a failure to narrow the fault . For example , do not boot failure generally occurs in the power supply circuit or 13M generating circuit , plus welding inspection and testing should be focused on these areas , and does not boot failure on unrelated RF circuitry, audio circuits do not light their "hands , moving feet . "

6 test key points

    After you determine the approximate range of fault , you should first suspicious of each welding point , if the problem still persists , you can test the key points of the voltage waveform , frequency, combined with works to further narrow the scope of failure , which is crucial , but also maintenance difficulties , requiring repairs were usually should accumulate more data and more experience, more than normal data recording some of the key points provide a reliable basis for the analysis and judgment .

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