Here is teardown of one cheap car USB charger. It failed after few years of use.
As you can see the fail was in soldering that connected two circuit boards. The fail had ripped of solder pads from circuit board.
The soldering quality on some other places also questionable.
There were 1A and 2.1A outputs. They are connected to same power supply, the only difference between them was how data lines are terminated.
There are not any fuse in this circuit.
End result: not worth to repair. Replace with better one. According to one review it is a good idea to avoid this kind of AD85063 based adapter.