one
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Take the notebook to the repair point, change a new adapter (note that the voltage difference can not be too much, this maintenance master knows) try, if normal to change the adapter.
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two
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If the light is on after replacement, but it is not charged, it may be a battery cell problem, change the battery test, and if the maintenance point does not go to the after-sales service.
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three
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If it is still not bright after replacement, check the charging circuit, which needs to be done by maintenance professionals.