Xiaomi 6X mobile phone will not be charged for a few seconds

Xiaomi 6X mobile phone will not be charged for a few seconds

It is found that there is a resistance between the capacitors connected at both ends of the charging and buck inductor. Replace a rich inductor, start the test, and everything is normal.

Machine model: Xiaomi 6X

Fault phenomenon: After a few seconds of normal charging, there is no charging sign.

Xiaomi 6X mobile phone doesn’t charge for a few seconds. Troubleshooting Figure 1

Fault analysis:

Xiaomi 6X mobile phone has a charging sign indicating that the charging ic has worked normally and then disappeared. First, check whether the working conditions of the charging ic are disturbed.

Maintenance process:

Last time, it was said that it happened after charging with a brand-name charger, so I suspected that the charging ic was broken and there was no chip replacement. Firstly, the step-down circuit is measured, and it is found that the resistance value is generated between the capacitors connected at both ends of the charging step-down inductor.

Xiaomi 6X mobile phone doesn’t charge for a few seconds. Troubleshooting Figure 2

It is the first time to remove the inductor and measure its resistance at both ends, indicating that the high voltage burned out the inductor and produced internal resistance.

Xiaomi 6X mobile phone doesn’t charge for a few seconds. Troubleshooting Figure 3

Replace a rich inductor.

Xiaomi 6X mobile phone doesn’t charge for a few seconds. Troubleshooting Figure 4

Boot test, everything is normal. At this point, Xiaomi 6X mobile phone will not be charged for a few seconds to repair the fault.