iPhone 12 Pro Max can't be turned on

iPhone 12 Pro Max can’t be turned on

Machine model: iPhone 12 Pro Max

Fault: iPhone 12 Pro Max can’t be turned on.

iPhone 12 Pro Max can’t be turned on Figure 1

Repair process: to the phone plugged into the charger, found charging 500mA charging current, charging when the phone feels obviously hot on the back, remove the motherboard, use the repair power to the motherboard to connect power, the current is directly about 5A, and the motherboard hot serious, indicating that the motherboard has a short circuit situation.

iPhone 12 Pro Max can’t be turned on Figure 2

This situation is usually caused by the filter capacitor being broken through. When the power was connected, the lower board was found to be hot by hand, and the iPhone 12 Pro Max motherboard was directly layered using an air gun to smoke the lower board with rosin for burn-in, and a small capacitor was found to be damaged.

Directly remove the damaged capacitor, again connected to the power, found that the motherboard is no longer leaking, replaced with a capacitor of the same size, with a test rack test has been normal, the fault is fixed.