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test a power wupply without a voltmeter


OK so yesterday i got this broken laptop from someone.  I knew the problem was the ac jack ( it would charge if the the jack was proped up in just the right way) but only if I used a power supply that did not come with the computer.  I have never soldered anything in my life but figured what the heck.  I took the laptop apart and located the AC jack.  Since I do not have the cash flow to buy a new AC jack I decided to experiment and just reflow the solder on each post of the jack.

Well things went well.....I think.  The problem is this.  When I plug in the power supply the "charge" led comes on for just a second or two and shuts off right away.  But there is further information about this power supply.  It is putting out 3 volts less then the original power supply.  Could this be the cause?  The think the OEM power supply is dead because I have nver been able to get the computer to do anything with that one.  Is there a way I can test this power supply without a volt meter or any other product to plug it into?

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