Chosen Solution
Slightly water damaged iphone 6 totally dead. removed the logic board, all the shields, & cleaned in ultrasonic solution branson EC, … Found no shorts anywhere( vcc main, pp_cpu, pp_gpu, var, sdram, …). Also all the rails’ voltages seem to be in range. Connected the Logic board only to DCPS. It does not even boot but draws 200 mA. PMIC gets warm but not hot. help would be appreciated!
Did you check ALL of the PMIC outputs or just the main ones? A faulty subsystem can pull the whole system down as well and it is often overlooked. If they all check out, then check the main subsystems that aren’t powered by the PMIc, such as MESA,CHESTNUT, BACKLIGHT. Then check the I2C lines to insure they are balanced and within range and take a look at the PMIC Reset lines (those that can be probed) to see if the problem is there. Finally, check the BBPMU outputs as well as a damaged BB system will impede the phone from booting. Also, what areas of the board were more corroded, that could give you some clues about where the damage actually is.
Does it show 200ma when dcps is connected or after button press. If it’s after button press I would check tristar
