Hp Power

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How do I test for polarity of a cylindrical DC jack on a laptop?

I'm replacing the cyclindrical DC jack on the end of my laptop HP power supply, but I know different manufacturers use different polarities on the inside (tip) and outside (Sleeve) of the jack. How do I test for polarity of this tip. Once I have it, should the laptop receptacle be the same?

To test it you could either use a multimeter or an LED (with suitable resistor in series).
As you're asking you probably don't have either of the above so it might be simpler just to look up the specs for your power-supply and laptop.
It might even be printed on your laptop. My ThinkPad is -ve sleeve.

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