is the original DC or AC? the same question to the replacement.
also test whether the replacement is actually putting out 19v and not any other voltage.
AC to DC, but why did you ask this? arent all pc uses AC to DC adapter?
and yes, it did 19v
because i have a few power bricks which outputs AC, if you plug that on a DC input laptop the laptop's input filters will short circuit.
really, if that is, then why does my power adapter doesnt lights up(test pen) ? that "replacement" adapter does lights up(test pen)
because the original is probably dead, the new one is working as intended.
test pen functions as an indicator whether "it works or not", if it lights up it works, if not then its dead.
if my memory doesnt betray me, i faintly remembered that some educator tells me that test pen also can check for leak current
define "leak current", e.g. what are you expecting to leak?
if you're saying the AC supply is leaking through the output, then it can be tested with a voltmeter set to AC.
or rather, you can test it by touching the output terminals with your bare hands, if it tingles then theres a problem.