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LEDs Instant Burn Out

post #1 of 19
Thread Starter 
I just got 4 x twin LEDs pre-wired to a 4 pin molex (red & black wires) I can see and feel the resistor connected to each LED. Thing is, when I connected them they glowed for maybe 3 secs then burnt out. Got really hot as well. If it was just 1 that burnt out I could cope with that but all 4?? Could they have the wrong type resistor wired to them? I've already contacted the store and await their reply but what's to say the replacements they send don't burn out?

Any suggestions/ideas?
post #2 of 19
It sounds like the LED's burnt out from too high voltage. Which of the wires is it connected to (on the molex connector) and what voltage are the LED's rated for? What is the resistance on the resistor? (in ohms)
    
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post #3 of 19
Thread Starter 
They're connected to the red and black (as stated above) I have no idea about the ratings as each one is just in a bag and doesn't have that info printed. I agree that they are getting too many volts which is why I think they have the wrong type resistor connected
post #4 of 19
Either they dont have a resistor or they have the wrong resistor hooked up to them.
post #5 of 19
Quote:
Originally Posted by tw33k View Post
They're connected to the red and black (as stated above) I have no idea about the ratings as each one is just in a bag and doesn't have that info printed. I agree that they are getting too many volts which is why I think they have the wrong type resistor connected
Can you try to get a photo of the resistors? The colored stripes on them will let us calculate the resistance.
post #6 of 19
Thread Starter 
That would mean pulling off the heatshrink and then the store won't take them back

It's these
Edited by tw33k - 8/5/11 at 5:13pm
post #7 of 19
Quote:
Originally Posted by tw33k View Post
That would mean pulling off the heatshrink and then the store won't take them back

It's these
Do you have an ohm meter? You can can probably use that without removing the heat shrink, just put one connector at the and of a wire and then put the other connector on a lead just between the heat shrink and the LED.
post #8 of 19
Thread Starter 
No I don't but I think I know what the problem is. They're wired wrong. The red and black wires are in reverse! I only just noticed it now. The link I posted before is wrong. This is them and you can see from the pic that they are wrong.

Thanks for your help

UPDATE: Maybe I'm wrong about that. I just read that it doesn't matter if the resistor is on the +ve or -ve. Either way will work. I just get the feeling that I'm missing something. They should just work.
Edited by tw33k - 8/5/11 at 10:51pm
post #9 of 19
Quote:
Originally Posted by tw33k View Post
No I don't but I think I know what the problem is. They're wired wrong. The red and black wires are in reverse! I only just noticed it now. The link I posted before is wrong. This is them and you can see from the pic that they are wrong.

Thanks for your help

UPDATE: Maybe I'm wrong about that. I just read that it doesn't matter if the resistor is on the +ve or -ve. Either way will work. I just get the feeling that I'm missing something. They should just work.
Current flows from negative to positive so the resistor would have to be on the negative side in order to reduce the voltage before it goes through the LED. If its on the positive side, the full 12V will go through the LED and then go through the resistor on the way out.
post #10 of 19
Thread Starter 
The resistor is on the red wire but the red wire is where the black wire should be (and vice-versa) None of them work at all now. I tried swapping the wires around but the LEDs must be shot. I just don't want the same thing to happen when they send me replacements
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