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iphone7反複提示未安裝sim卡
iphone7反複提示未安裝sim卡
更新时间:2024-04-29 15:46:47

首先看J_SIM_RF有無異常,接下來檢修SIM卡的信号

iphone7反複提示未安裝sim卡(iphone7不讀SIM卡維修方案)1

1.SIM卡工作電壓1.8V

2.複位1.8V

其他打阻值确定是否斷線或者相連IC是否空焊

還涉及到 SWPMX_RF :SIM1_SWP 與 SE2_SWP 的選擇開關

iphone7反複提示未安裝sim卡(iphone7不讀SIM卡維修方案)2

  1. 一般讀取指令,開機一下時測量SIM DET 1.8V電壓正常,通常為基帶虛焊

其他的SIM供電斷線飛線即可

18961180587

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