With the charger connected, no power light at all is indicative of no power being detected on the motherboard.
First thing to check is if the [link|https://www.ebay.com.au/itm/124129110360?chn=ps&_ul=AU&_trkparms=ispr%3D1&amdata=enc%3A15YMu58ThRpiC_J8e-hODWQ93&norover=1&mkevt=1&mkrid=705-139619-5960-0&mkcid=2&mkscid=101&itemid=124129110360&targetid=1598469863198&device=c&mktype=pla&googleloc=9070725&poi=&campaignid=19657035767&mkgroupid=143201283022&rlsatarget=aud-1721181094264:pla-1598469863198&abcId=9305369&merchantid=119226282&gclid=EAIaIQobChMI_MHKv72S_wIVt5NmAh1tCQbwEAQYAiABEgJIgvD_BwE|DC In jack] (supplier example only) is OK.
What can happen is that the centre +ve connector of the jack can break internally and this opens the power circuit between the charger and the motherboard so that the motherboard receives no power and thus the battery can't be charged either.
Here's the [link|https://dl.dell.com/topicspdf/latitude-e5540-laptop_owners-manual_en-us.pdf|owner manual] for the laptop. Go to p.29 to view the procedure to remove the DC-In jack (aka power connector).
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Once you have access to the connector' cable plug, disconnect it from the motherboard and then use an Ohmmeter to prove continuity of the wiring between the jack's centre + input (where the charger plugs into) and the red wires on Ihe jack's cable plug and also the jack's outer -ve input to the black wires on the plug. You could also connect the charger to the jack and check that there is 19V DC when measuring between the red and black wires of the plug.
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Once you have access to the connector' cable plug, disconnect it from the motherboard and then use an Ohmmeter to prove continuity of the wiring between the jack's centre + input (where the charger plugs into) and the red wires on the jack's output cable plug and also the jack's outer -ve input to the black wires on the plug. You could also connect the charger to the jack and check that there is 19V DC when measuring between the red and black wires of the plug.
If the jack is faulty it cannot be repaired, it has to be replaced.
Search online for ''Dell E5540 DC-In jack'' to find suppliers that suit you best.
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if the DC-In jack tests OK then there's a problem on the motherboard and further testing which would require having the schematics for the motherboard would be necessary to find out what's wrong.
+
If the DC-In jack tests OK then there's a problem on the motherboard and further testing which would require having the schematics for the motherboard would be necessary to find out what's wrong.
With the charger connected, no power light at all is indicative of no power being detected on the motherboard.
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First thing to check is if the [https://www.ebay.com.au/itm/124129110360?chn=ps&_ul=AU&_trkparms=ispr%3D1&amdata=enc%3A15YMu58ThRpiC_J8e-hODWQ93&norover=1&mkevt=1&mkrid=705-139619-5960-0&mkcid=2&mkscid=101&itemid=124129110360&targetid=1598469863198&device=c&mktype=pla&googleloc=9070725&poi=&campaignid=19657035767&mkgroupid=143201283022&rlsatarget=aud-1721181094264:pla-1598469863198&abcId=9305369&merchantid=119226282&gclid=EAIaIQobChMI_MHKv72S_wIVt5NmAh1tCQbwEAQYAiABEgJIgvD_BwE|DC In jack] (supplier example only) is OK.
+
First thing to check is if the [link|https://www.ebay.com.au/itm/124129110360?chn=ps&_ul=AU&_trkparms=ispr%3D1&amdata=enc%3A15YMu58ThRpiC_J8e-hODWQ93&norover=1&mkevt=1&mkrid=705-139619-5960-0&mkcid=2&mkscid=101&itemid=124129110360&targetid=1598469863198&device=c&mktype=pla&googleloc=9070725&poi=&campaignid=19657035767&mkgroupid=143201283022&rlsatarget=aud-1721181094264:pla-1598469863198&abcId=9305369&merchantid=119226282&gclid=EAIaIQobChMI_MHKv72S_wIVt5NmAh1tCQbwEAQYAiABEgJIgvD_BwE|DC In jack] (supplier example only) is OK.
What can happen is that the centre +ve connector of the jack can break internally and this opens the power circuit between the charger and the motherboard so that the motherboard receives no power and thus the battery can't be charged either.
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Here's the [https://dl.dell.com/topicspdf/latitude-e5540-laptop_owners-manual_en-us.pdf|owner manual] for the laptop. Go to p.29 to view the procedure to remove the DC-In jack (aka power connector).
+
Here's the [link|https://dl.dell.com/topicspdf/latitude-e5540-laptop_owners-manual_en-us.pdf|owner manual] for the laptop. Go to p.29 to view the procedure to remove the DC-In jack (aka power connector).
-
Once you have access to the connector' cable plug plug, disconnect it from the motherboard and then use an Ohmmeter to prove continuity of the wiring between the jack's centre + input (where the charger plugs into) and the red wires on Ihe jack's cable plug and also the jack's outer -ve input to the black wires on the plug. You could also connect the charger to the jack and check that there is 19V DC when measuring between the red and black wires of the plug.
+
Once you have access to the connector' cable plug, disconnect it from the motherboard and then use an Ohmmeter to prove continuity of the wiring between the jack's centre + input (where the charger plugs into) and the red wires on Ihe jack's cable plug and also the jack's outer -ve input to the black wires on the plug. You could also connect the charger to the jack and check that there is 19V DC when measuring between the red and black wires of the plug.
If the jack is faulty it cannot be repaired, it has to be replaced.
Search online for ''Dell E5540 DC-In jack'' to find suppliers that suit you best.
if the DC-In jack tests OK then there's a problem on the motherboard and further testing which would require having the schematics for the motherboard would be necessary to find out what's wrong.
Hi @boaz47008
With the charger connected, no power light at all is indicative of no power being detected on the motherboard.
First thing to check is if the [https://www.ebay.com.au/itm/124129110360?chn=ps&_ul=AU&_trkparms=ispr%3D1&amdata=enc%3A15YMu58ThRpiC_J8e-hODWQ93&norover=1&mkevt=1&mkrid=705-139619-5960-0&mkcid=2&mkscid=101&itemid=124129110360&targetid=1598469863198&device=c&mktype=pla&googleloc=9070725&poi=&campaignid=19657035767&mkgroupid=143201283022&rlsatarget=aud-1721181094264:pla-1598469863198&abcId=9305369&merchantid=119226282&gclid=EAIaIQobChMI_MHKv72S_wIVt5NmAh1tCQbwEAQYAiABEgJIgvD_BwE|DC In jack] (supplier example only) is OK.
What can happen is that the centre +ve connector of the jack can break internally and this opens the power circuit between the charger and the motherboard so that the motherboard receives no power and thus the battery can't be charged either.
Here's the [https://dl.dell.com/topicspdf/latitude-e5540-laptop_owners-manual_en-us.pdf|owner manual] for the laptop. Go to p.29 to view the procedure to remove the DC-In jack (aka power connector).
Once you have access to the connector' cable plug plug, disconnect it from the motherboard and then use an Ohmmeter to prove continuity of the wiring between the jack's centre + input (where the charger plugs into) and the red wires on Ihe jack's cable plug and also the jack's outer -ve input to the black wires on the plug. You could also connect the charger to the jack and check that there is 19V DC when measuring between the red and black wires of the plug.
If the jack is faulty it cannot be repaired, it has to be replaced.
Search online for ''Dell E5540 DC-In jack'' to find suppliers that suit you best.
if the DC-In jack tests OK then there's a problem on the motherboard and further testing which would require having the schematics for the motherboard would be necessary to find out what's wrong.