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AM3359开发板 U4 烫 可能是哪里的问题啊

Other Parts Discussed in Thread: AM3359

上几秒钟电PMIC芯片就烫手,测量了底板上的J21 J38 J28都是1脚的对地电阻比2脚的大,但是J29 J26 J32 J23 J25 J30 J22 J24都是1脚对地电阻比2脚小,请问可能是哪里坏了,怀疑是PMIC芯片或者am3359