Chosen Solution
Managed to get all functions going after water damage using the usual treatment. All fine with the exception of a quick battery drain. Even with just battery attached to logic board a known good battery was dying. I assumed there was a short on the board somewhere so tried finding it with freeze spray. Nothing showed up with battery so used a dc power supply as Jessa from ipad rehab demonstrated in one of her brilliant videos. Eventually I discovered a component that was warming up first. It was the charge control IC “Q1403” I have not removed it yet as I am still quite new to this type of work and not sure if this ic normally warms up first when dc power is applied to the battery connector. Should I be trying to put current through charging port instead? Absolutely any advice would be hugely interested Thank you.
Did you try to power on the device on power supply and test functions(wifi,bluetooth,call) which draw abnormal current?
