Problem 1. Dead / ON Problem.
Solution:
1. Check battery:
The cause of Death and non-on of all these earbuds is mostly due to the problem of this battery, then you need to change the battery first, even charging is also the cause.
2. Check the charging section.
3. The last option check the main IC / CPU.
Problem 2. Charging.
Solution:
Check if the charging connections are correct or not, then check if 5 volts are coming for charging, and check that the charging paths are not dirty or damaged.
and Check whether the battery of the power bank of the earbuds is good or not and see whether the voltage can pass well or not. Airboards will not charge if the voltage supply is not good.
Problem 3. Charging problem in the power bank of earbuds.
Solution:
1. Check whether the charging cable is good or not? Then follow the next step.
2. Check first if the charging connector is good or not.
3. After that check if the battery is good or not.
4. After that, check if the charging IC is good or not? And see if the IC is supplying the correct voltage or not?
5. If all is good then change the last option board.