Chosen Solution
Hello. My iPhone suffered severe salt water damage. I have replace most of the components excluding the cameras, ear speaker, vibrator, and antennas and panels. What I did replaced is the the dock connector, the headphone and buttons module, speaker and microphone module and sensors module and of course got a new battery. Opened the shields of the logic board and they seem to be ok, no burnt of charred components. Assembled everything and it seems to be working when charger plugged into computer USB or the AC socket, but charging of the battery won’t commence. I have checked with voltmeter the pins on the logistic board while the charger was attached. (Without the battery of course.) The reading said 0.27 volts (not 0.53 sorry, got mixed with something else). Could this be any indication to why iPhone won’t charge a new battery? Because I guess the voltage should be around 4 volts, the same as battery fully charged.
In that case you are having issues with the PMIC. You will have to properly measure the components outlined in the image. Check the inductors with a multimeter.
have you checked to make sure the pins are securly seated on the motherboard? If it wont charge usually indicates that either the battery is faulty or the pins have become separated from the motherboard.
