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RE: Dell Inspiron 15 3521 plugged in not charging

Check to make sure the AC adapter is recognized (F2 at powerup to check).  If it is not, replace the adapter first (with an OEM Dell adapter - NOT a third party unit).  If that doesn't work, replace the DC jack:

<<www.parts-people.com/index.php?action=item&id=13842>>

If that does not solve the issue, replace the mainboard.

If the AC adapter IS recognized, replace the battery.

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