Fixing the Efest Slim K2 Dual Lithium Ion Charger

Backstory

Recently while i had the charger plugged in doing its thing , the cable was yanked right off leaving the port in bad shape. After opening up the charger i saw that the usb connector traces were gone so this the story began.

Unfortunately while doing research searching about schematics or teardowns of some sort i realized that little to no information was available.

Another setback was that the markings on the ICs were removed so i had nothing to go by no schematics and no information.

As visible i scratched the board in a few places to be able to take measurements.

Repair

I knew i had to start somewhere so i decided to identify the IC's used in the design. It was pretty easy identifying the IC's by following the traces and signals on the board.

After following the traces and power signals i new that the chip used had to be the TP4056. After taking a close look at the datasheet i saw that Efest used the same exact design as the one suggested in the datasheet.

For future reference i decided to reverse engineer the whole board. The schematic is pretty simple and it just works.

The naming of the schematic follows the naming on the board.

Summary

Overall having had a crack at this board i can safely say that Efest is delivering a good product while keeping the cost low. But still having the markings of the IC's removed is a big con on their side since the charger can be easily fixed due to its simple design and short BOM list.
Thanks for reading hope this helped for any additional information such as the schematic etc leave a comment.