A customer sent us an iPhone X to repair, the fault described is that the charge icon displays normally, but the iPhone X not charging after dropped. Turn on the iPhone X to detect it, the fault is real. After communicating with the customer, the customer agrees that we should repair the iPhone X.
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 UT658 USB Tester, 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 station and Titanium Alloy 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 UT658 USB Tester, the current all is normal, the fault has been repaired.