Xiaomi 6X will not be charged for repair after charging for a few seconds

Machine model: Xiaomi 6x
Fault phenomenon:
After a few seconds of normal charging, there is no charge sign.

Xiaomi 6X will not be charged for repair after charging for a few seconds Figure 1.

Fault analysis:

There is a charge sign indicating that the charging IC has been working normally and then disappears.Firstly, check whether the working conditions of charging IC are disturbed.
Maintenance process:

The family said that it was like this after charging with the inferior charger, so it was suspected that the charging IC was broken and there was no chip replacement.First, the step-down circuit was measured, and it was found that diode value was generated between the Capacitor connected at the two ends of Inductor.

Xiaomi 6X will not be charged for repair after charging for a few seconds Figure 2.

Remove Inductor and measure that there are diode value on both ends, which indicates that internal resistance is caused by burning Inductor by high pressure. This is the first time to encounter this situation.

Xiaomi 6X will not be charged for repair after charging for a few seconds Figure3.

Replace a fortune Inductor.

Xiaomi 6X will not be charged for repair after charging for a few seconds Figure 4.

Maintenance results:
Boot test, everything is normal.At this point,Xiaomi 6x mobile phone does not charge after charging for a few seconds, and the fault is repaired.