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Step by step to fix iPhone XR doesn't boot issue

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+ digital multimeter to measure the grounding resistance, the resistance value measured is normal.

Step 6

Assemble the iPhone XR and test it. Assemble the iPhone XR,  press the iPhone power button, the iPhone XR turns on properly, the iPhone XR boot issue has been fixed!

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