Chosen Solution
Hi every one! The iPhone 6 dropped in a water and will not turn on anymore. I checked and removed the capacitor C5202_RF (smoked / shorted), removed the shields and cleared the board, but the phone still shorted. The power supply show me 0.050A (50mA) when I connect only the board, but I can not get any component warmup. I tried to use the term paper to help me identify it, but I have no dark points to analyze it. I checked some capacitors around the power controller, but it was a random test flowing the schematics diagram, but nothing in a short. Any suggestions for next verification? Thanks Felipe
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!
