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3.15 Can't charge
Replace the battery if is ok?
Measure the battery voltage if
is less than 3V.
Check the OVP IC， USB
connector and the components
around the connector if have a
poor soldering and re-solder it
Can't charge
Replace the charger and
USB Cable
N
N
N
Replace the PMIC
Y
Charger fault
Y
Replace battery
Y
OK
OK
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