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求助，dm8148的硬件问题

xiaoyan Chi
Expert 1247 points


8148的电源参考EVM8148采用tps6591133，没给芯片通电之前调试电源电压都正常。通上电之后发现tps6591133发热，之后发现把PLL_1V8和CORE_VDD两路电源断开后，电源芯片不再发热，电压也正常。测量板子发现8148的PLL_1V8对地短路，CORE_VDD正常。CORE_VDD为1.2V，PLL_1V8是1.79V.现在苦于找不到短路原因，求大神帮忙，万分感谢！！！