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Post originale di: Ben ,

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3.5V does not mean the battery is dead, it's just below starting voltage which means it just needs to be charged up and normally it would charge up in the phone.

If possible try another battery and see if you can switch it on, then see if it charges.

If it charges fine, turn the phone off while the charger is plugged in. Once the phone has turned off check if there is current still going through the charging port.

If not, replacing U2 Tristar charging IC.

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