iPhone 12 Pro Max mobile phone cannot be turned on fault repair

 Hello everyone: Welcome to Xunwei case sharing. Today we will discuss the repair ideas of iPhone12Pro max.


Machine model: iPhone 12 Pro Max

Customer description: The mobile phone cannot be turned on

Test results: The mobile phone cannot be turned on, and there is leakage and short circuit after power-on.

Fault analysis: Leakage and short circuit during power-on are usually caused by short circuit of the power supply connected to the battery holder. Mainly check the first-level power supply circuit. Open the Xinzhizao software, find the iPhone 12 Pro Max point map, and find the battery connection holder.


iPhone 12 Pro Max mobile phone cannot be turned on fault repair Figure 1

Open the iPhone 12 Pro Max point map, measure the battery connector pins, and find that the battery connector pins are short-circuited.


iPhone 12 Pro Max mobile phone cannot be turned on fault repair Figure 2


Fume the yellow area with rosin, and then power up the motherboard. The melted part of the rosin is the fault point. We operated on side A of the motherboard and found no faulty components. Then layer the motherboard, and then perform the same operation on the other first-level power supplies of the motherboard.


iPhone 12 Pro Max mobile phone cannot be turned on fault repair Figure 3


Finally, I entered the search and found that a capacitor next to the CPU on the upper B side was short-circuited. After removing the capacitor, the fault was repaired.


iPhone 12 Pro Max mobile phone cannot be turned on fault repair Figure 4


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