iPhone 8+ wont turn on and no connection on pc
Hi, I'm new to this world and I want to learn how to make repairs on motherboards, I picked up the phone on the internet, the old owner said it fell once and never came back on, after which he sent it to a technician experiencing a motherboard problem.
I firstly attached it to the 4.2 volt power supply and at power on it marked 200-300 mA, with the multimeter I checked VCC_BATT in the battery connection and it was normal, then I checked several capacitors in VDD_MAIN always in diode mode on ground and all ringed on both sides, does this mean that there is a short somewhere in VDD_MAIN? If yes, how can I understand which component to change?
Then I had read that with these symptoms it could be a problem with the USB signal and therefore to change U6200, I could not test the pins below because I still have to get the desoldering, but I checked a capacitor directly connected to the chip but it was normal . Im doing things the right way? Im a little confused, Thanks in advance.