Unexpected things happen everytime, Nobody wants his phone to be dropped. in an effort to keep things goes well, you may will charge your iphone. usually, all you have to do is plug it into the wall charger (wired charging) or placed it on top of your wireless charger then allow it some time to charge up. But for some reason, your iPhone X is not charging.
After testing, the iPhone X charge icon can display normally，but iPhone power percentage is getting less when it in charging, this is actually a not charge failure. According to our repair experience, for the dropped damaged iPhone, the L3340 and L3341 inductors of the iPhone charge IC are easy to empty weld and pin missing.
Connect iPhone charging cable to the iPhone X tail plug flex cable, and then test the cathode of iPhone battery by uni-t ut81b multimeter oscilloscope, no voltage was found, so we judge the fault is in the charging part. If you want to delve into it, we have to measure it hierarchically, the AP part as shown in picture.
The external conditions measured are normal, according to our experience, we suspect that the inductors are empty weld and pin missing. Use quick 861dw hot air rework and tweezers to remove the L330 and L3341 inductors, the pins of inductor are on the solder pad, it's like IPhone7, and the inductors are easy to empty weld and missing.
Put it under the microscope, and then replace the new inductors( note: if replace it with iPhone 6 inductors, you need to insulate it，otherwise, it's easy to short-circuit.)
Measure it by iPhone X logic board test fixture, the functions tested are normal. Connect iPhone with uni-t ut81b multimeter oscilloscope, the current all is normal, the fault has been repaired.