Chosen Solution
Hey guys,
I had an iphone with audio ic problem. Jumped C12 and tried starting it with a power supply. It told me it was short and I found a capacitor that was loose on VCC main. It was on the other side of the main board so it should not have been me who knocked it “loose”
Now when i plug in the battery or power supply the phone starts automatically. I have not seen this happen. When I switch off the phone it also reboots
Removed the audio IC to check if something is shorted but it looks clean and audio recording also work.
removed all the “glue” around the “power on button“ jack and dock connector jack and everything looks clean. Measured their values and those are all also correct according to ZXW.
EDIT: Swapped a board for the customer. I will send his board to China for repair. Labor isn’t worth the time/money.
Finally solved the problem. There was a resistor missing on TIGRIS_TO_PMU_INT_L and that made the iphone boot up every time when connected to power.
iPhones automatically switch on when connected to power. Once it switches on, just turn it back off manually and it should stay off.
