power jack voltage

Aug 4, 2018
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I bought a toshiba laptop on ebay that the seller said had a bad power jack. When I received it I disconnected the jack(it was harness type) at the motherboard. I then used a dmm to check the voltage at the harness end, where it plugs into motherboard jack and it read good(19 volts) but when I plug the jack back into the motherboard the voltage reads bad
 

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