There are around 20 --- 50mA current , but stops moving or slowly falling , this failure shows that software self-test , but off. There are current instructions for the hardware have been working , but the current is small , indicating that the memory circuitry or software does not work properly . Look for the following main points:

  ( 1 ) software malfunction ;

(2) CPU, memory soldered or damaged.

  Method of treatment , one with blowing welding logic circuits , the second is to use the normal version ( character ) or chip with data to be replaced , the third is to use software

Repair instrument repair.

4 There is a current of about 100 to 150mAmA , but soon fell

    This phenomenon does not boot up failure in performance , there are around 100mA power supply has reached the current boot the phone , this time if power should be part of a logic circuit function self-test pass or fail logic circuit fails , you can focus on checking the following points.

(1) CPU is soldered or damaged ;

( 2 ) versions of the chip is soldered or damaged ;

(3) whether the software is faulty ;

( 4 ) Power Engineering C Weld or bad .

5 There 100mA to 150mA of current , and hold most of the power of this failure with C and software-related work , can be targeted to overhaul checked.

6 Press the power button appears high current , but soon fell logic circuits such cases are generally caused by leakage or power supply IC .

7 Press the power button appears even large short-circuit current

This failure generally have the following points.

( 1 ) Power IC short circuit ;

( 2 ) short-circuit power amplifier ;

( 3 ) Other short-circuit power components .