After testing, the mobile phone leaked 20mA when it was powered on, and it was found that one chip had broken corners by layers. Looking at the schematic diagram of Xinzhizhao software, it was found that it was powered by USB accessories, so a chip was replaced, and there was no leakage when it was powered on.
Separate the motherboard, check the solder joints of the motherboard to see if there are obvious virtual solder joints, and then measure the solder joints from the motherboard to the upper layer. It is found that the main board has obvious solder joints falling off. After the solder joint is repaired, the measured resistance is normal. Re-attach the upper and lower layers, and repair the fault.
iPhone 11 Pro consumes fast power when in standby, mobile phone short-circuit current 20mA, replace a USB VCC accessory chip, troubleshooting.
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iPhone 12 does not turn on, main board Short circuit,The rosin smoke method, start Current heating test, remove the problem Capacitor, and repair the fault.
iPhone 11 Pro standby power consumption is very fast,short-circuit current 20 mA, replace a USB chip VCC, troubleshooting.
iPhone XS Max mobile phone screen does not display intermittently, scratch off PCB board, and re connect PMU_TO_DISPLAY_RESET_CONN_Repair the faulty wire.
iPhone 7 Update System reported an error of 4013. After detection, it was found that it was caused by the power supply S5 Baseband Short circuit. A 2.2k resistance was connected from 1.8V Baseband of RAM to S5 Baseband, and Update System passed smoothly.
The iPhone 12 Pro Max phone does not display when it is turned on. After replacing the fault Capacitor, the boot display is normal and the fault is eliminated.
iPhone XR did not respond to charging, r6201 to c6312 were disconnected, and Jump wire was finished.
