iPhone 7 Pmic seems to be failing?
I have checked in an iPhone 7 that seems to have spontaneously gotten extremely hot and then gone dead. As soon as I plug it into my dcps and turn the power supply on it pulls max amperage immediately without being prompted to boot. I immediately checked vdd main and vdd boost for shorts and the diode mode readings seem to be good, checking from a couple different points on the board. Next I checked for heat with freeze spray, and the pmic seems to get extremely hot immediately upon turning on my dcps. I checked the lines in the area of pmic where it got hot, which seemed to have been vdd main, vdd boost, nand 0v9 and nand 3v0 as well as a couple others, but I have no detectable shorts on any of them. Is it possible that the pmic itself is bad? Anything else I should check before attempting pmic replacement?
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