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Thread: Is reversed polarity a problem on front panel connectors?

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    Is reversed polarity a problem on front panel connectors?

    My hard drive activity LED and power LED on the front of my case are not working. I have read that the most common reason for this is that the front panel connectors are plugged in the wrong way round so current is going the wrong way. I really can't be bothered to sort this out until like the weekend (yes I am very lazy).

    Is this a serious problem. I got a new case the other day so it has only been like this for a couple of days.

    Thanks in advance.

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    stormrazer razer121's Avatar
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    Re: Is reversed polarity a problem on front panel connectors?

    Not with LEDs they just wont work
    Quote Originally Posted by TAKTAK View Post
    It was so small that mine wouldn't fit into it

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    Re: Is reversed polarity a problem on front panel connectors?

    Correct me if I am wrong (which i probably am) but don't all LED's have reversable polarity?

    And i would change it, its easy side case off and swap the 2 plugs over then test...5 min job if that

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    Re: Is reversed polarity a problem on front panel connectors?

    Quote Originally Posted by Predator View Post
    Correct me if I am wrong (which i probably am) but don't all LED's have reversable polarity?
    What does the D stand for in LED?

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    c.ruel (10-01-2011),Fuzzed_out (12-01-2011)

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    Re: Is reversed polarity a problem on front panel connectors?

    Hmmmm....Diode?

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    Re: Is reversed polarity a problem on front panel connectors?

    Quote Originally Posted by Predator View Post
    Hmmmm....Diode?
    Yes and as such will only allow current to move in one direction - reverse the polarity and the diode blocks the current:

    http://www.allaboutcircuits.com/vol_3/chpt_3/1.html

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    Re: Is reversed polarity a problem on front panel connectors?

    LEDs being diodes, only allows the current to flow in one direction. So if connected up wrongly they will just work like an open circuit (up to a rated voltage anyway), and open circuit is the same as not connecting it, hence why it is safe to connect them wrongly and just swap the direction. Do however be very careful with USB connectors, they do not like been connected up wrong, which is very easy if you have single pin connectors on your case. I have fried a device getting it wrong!
    (\__/) All I wanted in the end was world domination and a whole lot of money to spend. - NMA
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    Re: Is reversed polarity a problem on front panel connectors?

    Quote Originally Posted by oolon View Post
    Do however be very careful with USB connectors, they do not like been connected up wrong, which is very easy if you have single pin connectors on your case. I have fried a device getting it wrong!
    Your not alone there, I plugged my expensive USB pen into a computer and it destroyed it.

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    Re: Is reversed polarity a problem on front panel connectors?

    Took predator's advice and changed them round so my LEDs come on now. I also did some cable tidying ... took me like a freaking hour. But the inside of my case looks ALOT neater now and I now know that everything is connected up properly.

    As they say why put off what you can do today :S

    Pretty pleased with it now so if I get hold of a decent camera may post some pictures as I am pretty pleased with my new case and my amateur efforts at cable management hehe.

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    Re: Is reversed polarity a problem on front panel connectors?

    Reversed polarity, sounds like this is the guy you need :

    Salazaar : <Touching wood as I write this...>


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    Re: Is reversed polarity a problem on front panel connectors?

    Quote Originally Posted by kalniel View Post
    What does the D stand for in LED?
    This comment made me laugh a lot, thank you.

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    Re: Is reversed polarity a problem on front panel connectors?

    Quote Originally Posted by Fuzzed_out View Post
    This comment made me laugh a lot, thank you.
    The problem with it is most people do not know what a diode is. Normal guess I get is ... "is that some kind of fuse?"
    (\__/) All I wanted in the end was world domination and a whole lot of money to spend. - NMA
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