It seems that almost all the USB ports that I use for charging devices eventually get very slow to charge.
When I put a device in them to check output voltage it is often around 4.8v - 4.9v instead of 5.1v so devices charge too slowly after a while.
I've tried many different USB cables and none help so it does seem to be the port.
What I'm wondering is what causes this?
Is there a capacitor, resistor or transistor that could be replaced to restore their full charging capability?
This seems to happen regardless of where the port is whether it's in a PC, an inverter, a wall dongle etc.
Thanks
When I put a device in them to check output voltage it is often around 4.8v - 4.9v instead of 5.1v so devices charge too slowly after a while.
I've tried many different USB cables and none help so it does seem to be the port.
What I'm wondering is what causes this?
Is there a capacitor, resistor or transistor that could be replaced to restore their full charging capability?
This seems to happen regardless of where the port is whether it's in a PC, an inverter, a wall dongle etc.
Thanks