Here's the [link|https://dl.dell.com/topicspdf/inspiron-15-7577-laptop_service-manual_en-us.pdf|service manual] taken from this support [https://www.dell.com/support/home/en-us/product-support/product/inspiron-15-7577-laptop/docs|webpage] for the laptop.
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Does the laptop give any indication when the charger is connected?
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Go to p.34 to view the procedure to remove/replace the RTC coin cell battery
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''If not'' it may be a faulty DC-In jack or faulty charger.
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Have you checked that there is 19.5V DC at the output plug of the charger.
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If the charger is OK, then check if the DC-In jack is OK.
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Here's the [link|https://dl.dell.com/topicspdf/inspiron-15-7577-laptop_service-manual_en-us.pdf|service manual] taken from this support [link|https://www.dell.com/support/home/en-us/product-support/product/inspiron-15-7577-laptop/docs|webpage] for the laptop.
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Go to p.60 to see how to remove the DC-In (aka power adapter port) cable from the motherboard. Once it has been disconnected, connect the charger to the jack and then check if there's 19.5V DC when connecting a voltmeter to the jack cable plug's red and black wires. If not then the jack is faulty and will need to be replaced. Search online for ''XJ39G'' to find suppliers that suit you best.
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Not sure if you couldn't find it but on p.34 it shows the procedure to remove/replace the RTC coin cell battery
Here's the [https://dl.dell.com/topicspdf/inspiron-15-7577-laptop_service-manual_en-us.pdf|service manual] taken from this support https://www.dell.com/support/home/en-us/product-support/product/inspiron-15-7577-laptop/docs|webpage] for the laptop.
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Here's the [link|https://dl.dell.com/topicspdf/inspiron-15-7577-laptop_service-manual_en-us.pdf|service manual] taken from this support [https://www.dell.com/support/home/en-us/product-support/product/inspiron-15-7577-laptop/docs|webpage] for the laptop.
Go to p.34 to view the procedure to remove/replace the RTC coin cell battery
Hi @ting72625
Here's the [https://dl.dell.com/topicspdf/inspiron-15-7577-laptop_service-manual_en-us.pdf|service manual] taken from this support https://www.dell.com/support/home/en-us/product-support/product/inspiron-15-7577-laptop/docs|webpage] for the laptop.
Go to p.34 to view the procedure to remove/replace the RTC coin cell battery