９９００Ｘ型手机原理及故障分析（下）□沈克苹３几种类型故障的剖析及解决办法第一类开机故障这类故障属于较难处理的．由于故障现象十分相似，往往让人无从下手．其实，同属不开机，其本质是大有区别的．除了射频部分引起的不开机外，逻辑部分损坏造成的无法开机，原因... 9900X-type mobile phone principle and fault analysis (below) □ Shen Keping 3 analysis and solution of several types of failure The first type of boot failure Such failures are more difficult to deal with. As the symptoms are similar, people often can not start. In fact, the same is not boot, its essence is very different. In addition to the RF part caused by not boot, the logical part of the damage caused by the boot, the reason ...