If we switch onn the cell phone switch if it does not get any voltage means first we should check up the battery is there or not, if battery is there means we should check it off the voltage of the battery the voltage is should be around 3.7, voltage and then if the voltage is in condition of the battery means. We should check it of the pin of the battery if the pin is stuck in any lid means it should be clearly taken it and then we should switch onn the cell phone. If the battery and the battery conector is perfect means check it off the Power Ic. Whether the Power Ic is sending three types of voltages to all the circumstances.
The three types of Voltages are
VBB, VCore, V+O,
The VBB Voltage goes to the Flash, Ramand Cpu the voltage is around 2.7 Voltage. Then check the Vcore Voltage it voltage is around 1.9 Voltage. Then check the V+O, Voltage it supplies the voltage to Crystal around 2.7 Voltage and IC Supply 26MHZ. If there any condition has not worked means there will be some fault in this continuation. If all three conditions is ok means then theree will be a fault in CPU. In there are the cell phone cannot be worked.
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