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confused as to why my LED fried.

Fatboy

Feb 16, 2017
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I had some LED lights left over from some displays that I installed. They were hooked up to the white 24v 4.0A power supply in the pic. I had a 12v 5000mA power supply that I thought I could use. I hooked them up and the LED fried. I didn't think that could happen since it was 1/2 the volts and 5000mA. Does anyone know why this would happen? IMG_20170114_134422045_HDR.jpg IMG_20170215_173915657.jpg IMG_20170215_175706627.jpg
 

davenn

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Sep 5, 2009
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your LED pic is just a blurr

what is the make model of the LED strip ?
show better pic, show link to the product
 

Fatboy

Feb 16, 2017
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I can take a better pic but it won't do any good. It doesn't show make or model and they were just left over from a job I did so I don't have any info on them.
 

davenn

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I can take a better pic but it won't do any good. It doesn't show make or model and they were just left over from a job I did so I don't have any info on them.

yeah OK
well bluejets answered your Q as to why the second plugpack fried your LED strip
 

Fatboy

Feb 16, 2017
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Well, ok, thanks for your help but I still don't understand because the second plugpack was also used to power LEDs.
 

Harald Kapp

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Well, ok, thanks for your help but I still don't understand because the second plugpack was also used to power LEDs.
I agree, both power supplies are voltage output. They rely on the LED strips having internal current limiting, usually resistors.

Are you certain the polarity was o.k.? An LED can tolerate only very small reverse voltages. When powered at 12 V reverse voltage, an LED will be destroyed.
 

Fatboy

Feb 16, 2017
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Thank You! That makes sense to me.I wasn't sure how to hook it up because the power supply and the LEDs were from two separate jobs. I must have hooked it up in reverse.
Thank You
 
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