I have a Samsung R580 notebook in very good condition, when I test the power supply I get very low (0.6V) voltage on the pin and also on the inner barrel. (The plug has earth on the outer barrel and then a separate line on the inner barrel and also a central pin, again separate) I assume the pin is a sense pin that *may* only ramp the V up when the unit is connected?
When I connect the adapter with the unit dismantled I get no voltage across any of the pins on the DC IN plug.
Do you suppose this is a faulty power supply or is the fault with the laptop?
I'm considering just using a separate 19v adapter but am uncertain as to whether the V+ should be on the centre pin or the inner barrel.