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am335x 串口打不开



使用am335x做的板子,之前因为上电错误,335x的3.3V对地短路了,现在更换CPU后,板子大部分功能正常,但是引出的一个TTL的串口和一个RS485接口无法打开,测量串口和RS485对地、对核心板的3.3V阻抗均未发现明显的短路或断路情况,请问可能是什么原因呢?CPU虚焊?PS:调试串口工作正常。