IPhone12 phone can’t be turned on for repair due to heavy fall and deformation

IPhone12 phone can’t be turned on for repair due to heavy fall and deformation

IPhone12 phone can’t be turned on due to heavy fall and deformation, and the power-on key 1.8 is actually only 0.21. According to past experience, change the clock. Check the clock wiring.

Machine model: iPhone12

Fault phenomenon: the mobile phone will not turn on after heavy fall and deformation.

Maintenance process:

An iPhone12 was heavily dropped, deformed and bent, and the motherboard was removed in layers. It was found that the bending corner was seriously dropped, and the single board could be turned on, and the flying wire was patched up.

IPhone12 mobile phone heavy fall deformation does not turn on the machine maintenance Figure 1

Then I found that the single board can be turned on for a while and can’t be turned on for a while, and there is no voltage when pressing the power button. Considering the cooling of the motherboard, it is turned on after reheating, and the measurement of the power-on key 1.8 is actually only 0.21. According to past experience, replace the clock.

IPhone12 mobile phone will not be turned on after heavy fall and deformation. Figure 2.

After the replacement of the clock, the problem remains after the motherboard cools down, and the power-on key is only 0.21, considering the board layer.

Open Xinzhi Zao and check the clock wiring.

IPhone12 mobile phone heavy fall deformation does not start maintenance Figure 3

IPhone12 mobile phone heavy fall deformation does not turn on maintenance Figure 4

It is found that all of them pass through the second floor near the hard disk, and the corresponding positions near the hard disk are excavated to dig out CLK and 1.8Always.

IPhone12 mobile phone will not be turned on after heavy fall and deformation. Figure 5

Move the crystal oscillator.

IPhone12 mobile phone heavy fall deformation does not start maintenance Figure 6

Test that the boot is normal, and stabilize the boot key 1.8. Fit the motherboard and repair it perfectly.

Note: After adding a clock here. Even if the board is soldered, the clock in the original position should be removed. During this period, the pink screen appeared when the machine was turned on for the first time, so it is not advisable to change the clock without layering.