3 , repair large current does not boot also has a variety of methods , such as temperature sensing method, the segmentation method , ground resistance method.

    Under normal circumstances, I was using the method of temperature sense , the power meter transferred to 0V, the clip on the power , slowly lifted voltage , 300mA almost about to stop , and then hand touch the components on the circuit board , which elements feel hot compared powerful , most problems can be solved remove , replace OK; segmentation method can not be used in concrete are generally identified as heat under which circumstances the use of components , specifically the power of each branch separately IC output cut to determine which branch circuit leakage occurs ;

    Ground resistance method is also more practical, but rely more than usual resistance data accumulated some normal models , as the maintenance of reference. Do not explain this .

    4, the following give examples of some common maintenance models for your reference :

 

    ( 1 ) 8210 Leakage : Customer Carry a cell phone N8210 , took a hand , Oh, the phone came out of the whole relic buns , warm , plug in the power , wow , power current of 500mA, standby current of about 400mA, at launch almost 800mA up ! Where such a big power drain ? Unlike a power amplifier, power amplifier general N8210 is to launch a large multi- leakage current . Plus electricity, the leakage current is controlled at about 200mA, touch the power supply IC, not heat it! Touching audio, also normal , touching , CPU, fonts are cool, no reason , leakage power is so big , there must be something which is hot , and then touch the small capacitance resistors, ha ha , finally found the culprit this time , the turned out to be the right of the six pipe charging IC pin leakage should be burned breakdown caused by charge , removed from the board look good to put the phone normally, troubleshooting.

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