DC power jack repair guide | Laptop Repair 101 Laptop DC power jack repair guide. unless of course you have some way to follow the runs and solder wiring from the pin to whatever that pin needed to power. . luck 😀 Otherwise, its technique that you need help with. Make sure that your soldering irons tip is very clean. DC Power Jack Wiring | All About Circuits Hi all, Looking for some quick assistance (easy one) on how to properly wire a 3-pin DC power jack. I don't need/want the switching pin. The positive pin I am assuming is the center. The switching pin I am assuming is the pin that does not have continuity when I test between it and the jack.. Wiring for Power adapter? - HP Support Community - 746693 Wiring for Power adapter? 07-03-2011 12:37 PM. I have Now I wanted to make my old laptop work again and needed that type of charger which is not available and tomorrow is Eid hollyday, so I am doomed. I have another HP product (CQ41)which died 6 months ago but the charger remains. 3 wires on a (bipolar) DC plug - what are they for? 3 wires on a (bipolar) DC plug - what are they for? Ask Question Asked 2 years, 3 months ago. In this way a large laptop might run from a 60 W PSU but it won't charge the battery unless a > 90 W PSU is detected. Apple power supply: thick AC cable, thin DC cable - why? 4.