Friday 03 January, 2020 |

iPhone XR doesn't boot- how to fix?

Here is an iPhone XR won't turn on during the normal use. When pressed the power button, the iPhone XR doesn't respond, the iPhone screen keeps black. Use iPhone charger to charge the iPhone XR for a while, the iPhone XR still doesn't boot. How to fix it?

Because we have charged the iPhone XR, so we confirmed that it's not the battery power problem. Use screwdriver to remove the screws at the bottom of the iPhone screen, put iPhone XR on the CPB screen separator to heat, after a while, use screen sucker to open the iPhone screen.



Remove the iPhone XR display assembly, measure the iPhone XR motherboard by DC power supply, it leaks 710mA.

Take off the iPhone XR motherboard, put it under a Trinocular Stereo Microscope to observe, we found the shield had crushed marks.



Use tweezers to remove the shield, and then put iPhone XR motherboard to a PCB holder fixture.

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.

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.



Assemble the iPhone XR, press the iPhone power button, the Apple logo appears normally, after few seconds, the iPhone XR gets into IOS system successfully. Test the iPhone XR functions, they will works good.

by Bellin

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