Troubleshooting of Apple iPhone 12 mobile phone not turning on

Connect the power supply at the two terminals to the 1.8v burner. It was found that the rosin on the surface of a capacitor melted, and the resistance of the two terminals was normal after deduction, and the main board was no longer leaking when it was powered on, and the current jumped normally by pressing the power-on key.

Machine model: iPhone 12

Fault phenomenon: the mobile phone does not turn on.

Maintenance process:

In the afternoon, when the customer finished his lunch break and prepared to continue watching TV, he found that the mobile phone didn’t turn on. Before that, the mobile phone didn’t show signs of failure. Why did it suddenly turn off when it was used well?

Apple iPhone 12 mobile phone does not turn on the fault maintenance Figure 1

When I got the customer’s mobile phone and pressed the power button, there was no response. I took the mobile phone apart and connected it to the maintenance power supply. I found that it was connected to a large current. This situation was that the motherboard was in a short circuit state, and the power supply at the two ends of the motherboard was smoked with rosin, and the power supply at the two ends was connected to a 1.8v burning machine. It is found that the rosin on the surface of a capacitor melts, and the resistance of the two terminals is normal after deduction. Looking at Xinzhizhao software, it is known that this capacitor is a PP_VDD_MAIN power supply filter capacitor.

Apple iPhone 12 mobile phone does not boot fault maintenance Figure 2

Apple iPhone 12 mobile phone does not boot fault maintenance Figure 3

Connect the power to test that the motherboard no longer leaks electricity. Press the power-on key and the current jumps normally. Install the motherboard into the machine, and start the test phone to display normally. Boot test, the customer’s iPhone 12 boots normally, and the fault is solved perfectly!