(2) T191 does not boot into the water : a T191 phone , customers have been sent into the water when said three or four days , because of a business trip, until today only used for repair. Disassemble , the host has severe corrosion black, after careful cleaning and electrical test machine , currents up to 300mA does not boot , touch the power IC heat, try again after replacement, troubleshooting .

 

    ( 3 ) Dongxue T38I does not boot : power- namely, short circuit, disassemble , motherboard logic partially covered with rosin , all major components have been moved, carefully cleaned after multimeter measurements have not shorted , clip on power , but also to boot, but as long as a shell fitted , short circuit does not start immediately . According Symptom determine what parts board Weld it. After the board is powered on, pressing his hand CPU, no problem , and then character, staging and power , not short-circuit . Finally, when by tight end plug , power meter automatically protected immediately after the end plug removed, and then loaded on the shell , all the normal boot , the problem would be planted here in the end . Careful observation of the tail plug on the motherboard plate line , and some have " peeling ", and with tape insulation installed after the end plug , OK, boot, troubleshooting, try to charge , no problem. ( Maintenance practice, has encountered many cases of leakage is caused by the phone's tail plug positive and negative short-circuit fault , did not check out at the beginning , the power amplifier, power everything removed, or leakage, the last to find out. )

Second, press the power button no current response :

    Causes of failure, generally have the following four :

    1 , the power button damage caused ;

    2, the power line problem , the power button to turn the power trigger end has disconnected ;

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