Charges slowly when turned off, doesn't charge at all when turned on

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Samsung Galaxy A40

The Samsung Galaxy A40 was released in April 2019.

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catkaiju @catkaiju

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Gepost: 28 feb. 2025

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Charges slowly when turned off, doesn't charge at all when turned on

As the title says. The phone charges slowly when turned off (I know this because after it runs down to zero and shuts off again, if I leave it, it's about 5% charged in an hour). But when I turn it on, it doesn't even recognise that it's plugged in, and quickly runs low again. What's going on with this? I've tried chargers that are 100% confirmed to work in other phones and devices, on various sockets around the house, and nothing helps.

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bill @ruggb Rep: 7,4k 5 6 1 · Answer 1 · 2025-02-28T11:37:14-07:00

bill @ruggb

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Either the charger can't supply the current the phone is asking for, the cable is bad, the socket is bad, or the phone charging circuit is bad > ^^^^in that order of troubleshooting.

Obviously, some current is getting to the phone or the battery wouldn't charge at all. When on, that current first goes to running the phone so the battery can't charge - there is no current left for the battery.

Low current could be due to low voltage, which could be due to a bad adapter, cable, or connection.

Make sure there is no belly button lint inside the phone socket.

Worst case would be a problem with the phone charging circuit.

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Samsung Galaxy A40

Charges slowly when turned off, doesn't charge at all when turned on

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