원문 게시자: Minho ,
What do you mean by “all the PP lines”? There are nearly 50 power lines in an iPhone 7…have you tested them all or just a few. As for the “VCC” lines, there are only two. Please be more specific about which lines you have checked and whether or not they were looked at in diode mode, voltage mode etc. The better the info you provide, the better the answers you will receive. Working on dead iPhones requires a systematic approach when there are no obvious failures. You start with the three main lines, then Boost, then the main BL/LCM/Touch lines, then the PMIC outputs (switchers and LDO’s), then the BBPMU outputs and then whatever LDO’s you haven’t already looked at (Mesa, Mamba, Camera etc.). If you have any visible clues, like corrosion, burn marks or heat signatures, then you can focus on those first.