Chosen Solution
i’m not exactly sure about the problem with your cable. bu in common, the main parts that get faulty first are: the last inch after the connector to the notebook or the counterpart of the connector on the mainboard the mainboard conector can be replaced or most of the time it can be repaired - but be careful - those chinese power supplys can be dangerous - so better get an original one
as far as i know should the part on the mainboard look like this when you hold the plug from the power supply anf try to wiggle it (just) a little bit (sorry - bad 20yr flashback) - does the connector “move” inside the notebook ?
ok i took it apart, the plug on the mainboard didn’t seem loose at all. i resoldered it into place and cleaned with compressed air and put the laptop back together. still pretty flaky. i guess the next step is replace the part or replace the power cord…
check your power supply output using a small volt meter (radio shack has them for less than ten bucks) after that you need to check the output from your main board. this requires you to put meter on leads of power connector first without power, then with battery power, and lastly the power adapter. Go to manufacturers site to get specifications for your exact model. What this will do is eliminate the components you are testing based on their output. Whichever is below specified output are to be replaced