Press the power button, but the iPhone XR doesn't boot. We are going to fix it step by step. Step 1 Disassemble the iPhone XR. Use screwdriver and pry tools to disassemble the iPhone XR, remove the iPhone XR display assembly. Step 2 Measure the iPhone XR motherboard. Disconnect the iPhone XR battery, connect the iPhone XR motherboard to a DC power supply, it leaks 710mA. Step 3 Observe the iPhone XR motherboard. Take off the iPhone XR motherboard, put it under a Trinocular Stereo Microscope to observe, we found the shield had crushed marks. Step 4 Find out the faulty part. Use tweezers to remove the shield, and then put iPhone XR motherboard to a PCB holder fixture. Now use soldering iron to smoke some rosin to the motherboard, we found a small filter capacitor next to the iPhone power IC melted first, which was part of the fault. Step 5 Fix the faulty part. Use hot air gun and tweezers to remove this filter capacitor, and then use Fluke 17B+...
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