iPhone 12 Pro Max cannot be powered on for repair

iPhone 12 Pro Max cannot be powered on for repair
Machine model: iPhone 12 Pro Max
Customer Description: normal use of no booting
Test results:Won’t Turn On, power on large current.
Fault analysis: power on large current, which is generally caused by the second level VCC Short circuit.
Open the Xinzhizao Soft software, find the iPhone 2 Pro Max physical annotation diagram, and find the power management chip.

iPhone 12 Pro Max cannot be powered on for repair Figure 1.

According to Boardview, the chip name is u3300, and then to schematic of schematic u3300, the power output circuit is measured with schematic and Boardview.

iPhone 12 Pro Max cannot be powered on for repair Figure 2.

iPhone 12 Pro Max cannot be powered on for repair></p>
<p>iPhone 12 Pro Max cannot be powered on for repair Figure 3</p>
<p>Because iPhone 1 12 Pro Max is the upper and lower motherboards, the power chip is on the upper B side, so it can't be measured directly.separate has high risk. According to the easy to difficult maintenance mode, and without separate, power on first and then quickly touch the abnormal high temperature area of the motherboard.</p>
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iPhone 12 Pro Max cannot be powered on for repair Figure 4.

Finally, it was determined that the fault point was caused by Capacitor Short circuit next to Nand. After checking shielding cover, it was found that Capacitor c4200 beside u4200 was damaged. Take down Capacitor and repair the fault.