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PC Building – Case LEDs

August 18th, 2005 Leave a comment Go to comments

The other week, when I was assembling the components for my MythTV box, I stumbled into a little problem.

When I was connecting the switches and LEDs on the case to the motherboard, I had no idea of the polarities of the wires! I read the labelling on the wire, but the was no polarity on that, I tried to find the anode and cathode on the LEDs but could get my head far enough into my case to see, and there was no markings (about polarity) on the connector blocks (but there were on the motherboard!)

Now, I’ve done Electronics at A-Level (about 5 years ago!), so I am aware that the switches should really work no matter the polarity, but the LEDs certainly won’t. Therefore, I don’t want to risk either blowing the LED (that would be a pain), or blowing the motherboard (that would be a very big pain, and expensive!) – I figured that basically blowing the LEDs won’t blow the motherboard, but I’m not willing to take that risk.

Fortunately this morning I’ve found the answer here (just under Figure 16):Just install these wires to the connector with the same name on the motherboard. On the wires we marked “polarity required” you will need to match the positive (+) and negative (-) markings on the motherboard. The white (or black) wire should be installed to the pin marked as negative (-) on the board.Bingo!

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