today i received a board a2681 820-02536 m2 this board stuck in 5 volt i check some volt all ok but pp3v3_aon is low, here 1.6v , when I hit the pmu it turned on, then after a while it did not turn on, then I changed pmu but same problem , someone help me what is the problem why pp3v3 is 1.6v i checked here no short