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TMS320F28034 VDD对地短路



您好,目前我28034出现一个问题想请教一下,目前情况是这样的,裸片烧写程序,无异常,贴片功能测试正常。但没有确认电流和IC是否发热。现因要升级程序,将仓库PCB重新烧写程序,发现28034发热且稳压电源的输出电流变大,然后28034烧坏,测试故障板发现28034的VDD对地短路,另外JTAG端子1,2脚也对地短路了,什么情况对导致这些情况呢?谢谢