How/what to test in HP elitebook 6930p laptop charging circuit

[Needheplp2016]

I think something in my laptop's charging circuit has gone bad because I tested the adapter and power Jack and they're both fine, I even tried removing the battery and holding the power button for 30 seconds. what components should I test. It's HP elitebook 6930p

 

[Im Spartacus]

This link will give you an idea of how to test the charging circuit but is not for you laptop,
https://www.youtube.com/watch?v=qcWowCgOFOw