The user is having problems with their Samsung Galaxy A02 after it was repaired. The screen lights will flash and then go off, and the charging sign will show up and then go off as well.
There are a few things that the user can try to fix the problem:
* Force restart the phone: This is done by pressing and holding the power button and the volume down button at the same time for a few seconds.
* Check the charging cable and port: Make sure that the charging cable is properly plugged into the phone and that the port is free of debris.
* Try a different charger: If the phone is not charging with the current charger, try using a different one.
* Boot into safe mode: This will start the phone up with only the system software running. If the phone works in safe mode, then the problem is likely caused by a third-party app. The user can then uninstall the apps that they recently installed one by one until the problem is fixed.
If none of these solutions work, then the user will need to take their phone back to the repair shop or to Samsung for further diagnosis.