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1.不能开机我们先看一下正常开机需要经过哪些处理过程:按下“开机”键一开机指令送到电源 IC 模块一电源 IC的控制脚得到信号→电源 IC 工作→CPU:13 MHz 主时钟加电→CPU 复位及完成初始化程序→CPU 发出“power on”(电源开启)信号到电源 IC 块→电源 IC 稳定输出各个单元所需的工作电压→手机开启成功,然后进入入网搜索登记阶段。根据开机的处理过程,我们可以分析出下列相关部分需进行的检查和处理。由于手机的开机键使用较频繁,此按键是否接触不良?电源 IC 模块虚焊或烧坏?由于该 IC 的工作电流较大,故它出故障的概率比较高。电源 IC 有无开机信号送到 CPU?
1. Can not boot We look at the normal boot need to go through what process: Press the “boot” button a power-on command to the power IC module a power IC control pin to get the signal → power IC work → CPU: 13 MHz master clock plus Power → CPU reset and initialization → CPU sends “power on” signal to the power IC block → power IC stable output voltage required for each unit → cell phone open successfully, and then enter the network search registration phase. According to the boot process, we can analyze the relevant part of the following required inspection and handling. As the phone’s power button to use more frequently, this button is bad? Power IC module Weld or burn? Because of the larger IC operating current, so the probability of its failure is relatively high. Power IC whether the boot signal to the CPU?