1, PU1 (BQ24703) charging control chip, if damaged, the battery will not be able to chare. Or there is no response when press the power button. Or cannot boot.
2, PQ9 charging control mosfet, will not able to boot, plug power adapter, the led flicker.
3, PR19 resistor, if open circuit or pseudo soldering, will can not charge, or charge can not up to 100%.
4, PQ4 if damaged, only normal boot when power supply via battery, but system halted when power supply via the adapter.
5, PQ2 if damaged, only noot normal when power supply via the adapter,..read more
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