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打印CCC JTAG连接显示: Device is held in reset. Take the device out of reset, and retry the operation

Other Parts Discussed in Thread: AM3358

我公司生产了几十块8127主板,其中有三片上电打印C,但是用JTAG连接的时候显示 Device is held in reset. Take the device out of reset, and retry the operation。请问这是怎么回事?应该检查哪里?有没有具体的check list之类的东西,一项一项的检查?排除硬件问题?应该是硬件焊接不良吧,BGA类的芯片都重新焊接过,但就是不行。请问该如何修复剩下的几块8127主板?