Situations:

Firstly, check the power bank whether are kept in abnormal temperatures. If yes, it could be “cooked”

Secondly, if it was discharged improperly fast, it could have broken.

If you are recharging it in hot ambient temperature, that would be the reason for not charging.

If above situation have happened on your power bank, please allowed the following items.

1: Try to connect the power bank to power your phone, while phone battery is depleted, you will see if power bank is outputting any power.

2: Try to recharge the power bank in a cool place, during the night, connecting to a good quality USB power supply that goes in the outlet.

During proper recharge the power supply should be warm (independently from led activity).Just let it there for at least 8 hours. In the end power supply should not be that hot anymore.

3: The most important is stop using cheap power supply to recharge your power bank.

If you have tried above items already, also you can charge the power bank through different outlet. If still not working. There would be 2 things happened. The circuit board that connects the LED lights could be dead or someone gotten malfunctioned or your power bank is dis-functional and it could have broken to something on the circuit board or from extensive use.

If the power bank is broken, you’d better contact the power bank seller or buy a new one.