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TMS320C6414T 焊上之后出现内核电源与地,I/O电源与地短路的现象

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TMS320C6414T 新的片子  焊上之后出现内核电源与地,I/O电源与地短路的现象,检查原理图和PCB无误,请问这是什么原因引起的?正常状态电源和地的阻抗应为多少?