This post is about an iPhone 15 that had waterdamage and due to that wasnt able to receive any network connections anymore. Step-by-step solution from begin to end.
Diagnose
The first thing we did was make a diagnose.
1. Visual check for defects.
2. Connect to power supply and check current.
3. Connect to power supply and press power button and check current.
4. Measure in diode mode around BBCPU IC on big caps.
Repair
After the diagnose we start the repair. We know where the problem likey will be and we are going to take action.