You'd almost need more than just a DMM to dig into one of those things as well, a scope and more than likely a Logic Analyzer would be the tools necessary to tackle a proper troubleshooting of one of those. To make things even more fun, there could be multiple issues that all cause the same problem. No one has diagnosed every issue every controller has, least not to my knowledge, and you could even have one that has an all new issue, so unless you have a working JDM-055 to start comparing this and that to there's really no easy checks to tell you what exactly is wrong. If the board looks pristine, then there's really no telling what could be wrong, as 99% of the time you just need to go where the last person was fiddling around with it and usually you'll find the problem. The PMIC that does all of the power management, then the MCU that controls everything including the PMIC, so if it's not working right, odds are one of them is causing the problem.
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