Chosen Solution
I’m having some issues with an iPhone 7 plus board number 820-00249-a. I bought this phone which was bootlooping and giving error 4013. The first thing i did was check the audio ic by reflowing it and giving it a litle nudge. After that the phone no longer worked and wasn’t recognized by pc. So I removed the ic and of course the c12 pad fell right of so i made a jumper reballed the ic and put it back on but no luck. All voltage lines are working no shorts. If I connect the board to a power supply and press the power button it’s draws about 50ma constantly. I’m guessing it is a data line problem but I don’t have new ic’s to test with. My question is if I were to let’s say remove the u3101 or any other ic that communicates with the cpu and try to boot the phone would it boot or boot loop or draw current in a different way or is this 50ma draw a thing that happens if a ic doesn’t respond. I’m quite new to this and would really appreciate any help.
Error 4013 could be a Baseband issue. I would check the power rails (BBPMU_RF) going into the Baseband IC to see if there are any issues.
After a couple of hours I’ve managed to fix it thanks.
