I accidentally dropped my A71, and it's back cover cracked. And when I tried to charge it (even while powered off), it couldn't charge. I tried another charger, plugging it in a different power socket, plugging into a PC, but it didn't work. The USB port is clean. So I went to a Samsung Service Center to have the phone checked. They repaired it. It costs me 2000 pesos. I returned home to test the charger. When I plugged it in, it works now! Samsung has great service center. It only took a couple hours, and the phone is now fixed.