1. Do not turn on, press the power button ammeter pointer micro-movement or immobility, this phenomenon is mainly due to the power signal break or power IC(not working) caused.
2. Do not turn on, press the power button current indicator current, which is much smaller than the normal value of about 200mA, but loosen the power button ammeter pointer back to zero, this phenomenon indicates that the power part is basically normal, the clock circuit is not working properly or the CPU is not working properly.
3. Do not turn on, press the power button ammeter pointer indicates the current of 200mA or so. Stop for a while and immediately return to 0mA. This is a typical chip data confusion caused by software does not turn on the fault.
4. Press the power button and there is a leakage current of about 20 to 30mA, indicating that a component of the power supply is short circuit or damaged.