The hottest topic today for smartphone technology area is fast charging and Samsung Galaxy S6 is one of the best smartphones who apply fast charging early. Most people benefits from fast charging in Galaxy S6. But some of you may meet the problem that S6 fast charging not working. Here you may find the answer.
When connect your S6 with charging cable, you can see the capacity left and estimate time to full charge the phone. If you find the info it shows is illogical, you will consider there may be a problem.

You can check if the connector of the cable is missing a sheet metal like the picture below, and get another fast charging cable samsung to see if it is because of the cable.

If the new cable make Galaxy S6 Fast charging working, then you will see accurate fast charging time show in your S6.

But if it is not the problem of the samsung galaxy s6 usb cable and your S6 fast charging still not working with the new cable, then you may need to get another charger.