Chosen Solution
Iphone SE - light water damage. Phone boots up nicely but freezing after putting last digit of the password. (A little googling and found that NFC ic could do that). Removed board and it was a bit corroded around U5301_RF chip. I was missing STOCKHOLM 5V (it was showing 0,6 V). So changed the U5301 and also U5302 - now the result on STOCKHOLM 5V line is showing the VCC_Main value and not booting the line up. What value has to be the enables lines?
I would suspect the enable lines to be 4.1V “VCC_MAIN voltage” and that is what I would expect from the STOCKHOLM 5V line to be if you were measuring that line with the logic board out of its housing.
