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MP4手机大都采用以下组合:CPU为MT系带MP4功能MT6219AT、电源为MT6305、射频IC为MT6129HX。此组合不开机的维修思路不外乎:电源电路、复位信号、时钟电路、磁控电路、软件、逻辑电路、开机请求线及查断线。下面以高科V878为例,说明MP4手机不开机的维修思路与方法。一、V878电路
Most of the MP4 mobile phones use the following combination: CPU for the MT tether MP4 function MT6219AT, power for the MT6305, RF IC for the MT6129HX. This combination does not boot more than maintenance ideas: power supply circuit, reset signal, clock circuit, magnetron circuit, software, logic circuits, boot request line and check the line. The following Hi-tech V878, for example, shows MP4 mobile phone does not boot maintenance ideas and methods. First, V878 circuit