原帖由： Minho ,
Have you properly decontaminated the logic board in an ultrasonic bath? That is the first step that must be done. As for troubleshooting a dead phone, you have to take an analytical approach. Different techs take different approaches but here is what I suggest. Start by checking PP_BATT_VCC & PP_VCC_MAIN for shorts. If one of those lines is shorted, you have to find the source. This is not always easy but look for visual clues such as where the board was aggressively attacked by corrosion. Your phone doesn't draw much current so you won't be able to look for heat. What this tells me is that some important subsystem is not working, impeding the startup process. Look at the output voltages of the PMIC, such as PP_CPU, PP_GPU, the SDRAM and NAND outputs as well as the Tristar output. Look for shorts with the device unpowered and then check for voltages with the power applied. Report back!