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Author Topic: Polarity on this laptop DC jack  (Read 877 times)

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Offline SolderOcelotTopic starter

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Polarity on this laptop DC jack
« on: November 09, 2018, 10:18:48 am »
I want to measure if there is voltage between the DC jack and motherboard. This DC jack has 5 legs. Which is +? Which is -? What are the other ones, just support?

https://www.dropbox.com/s/27etfzauw4wt669/dc-jack.jpeg?
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Offline capt bullshot

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Re: Polarity on this laptop DC jack
« Reply #1 on: November 09, 2018, 10:41:41 am »
Looks rather obvious. For pins are connected, and one isolated.
So I'd guess the connected ones are "-" and the left over "+" as this is most common. Might be reversed, that's what you use your DMM for to determine this.
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Offline wraper

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Re: Polarity on this laptop DC jack
« Reply #2 on: November 09, 2018, 10:43:21 am »
4 legs are connected to ground (-), it's quite obvious because they consist of single piece of metal. One leg separated with a piece of black plastic on the bottom right corner is +.
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Offline SolderOcelotTopic starter

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Re: Polarity on this laptop DC jack
« Reply #3 on: November 09, 2018, 11:04:02 am »
Honestly it did look obvious to me too but I just wanted to make sure  ;D
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