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LED solder overheat? Answered

I hand soldered some surface mount LEDs and most of them seem broken now. I assume I overheated them. However, I`ve soldered lots of other kinds of surface mount LEDs with no problems, even really small ones were fine. The problem was with some warm white (yellowy white) LEDs. I removed some of them to check for a soldering error and they still won`t light up when I test them so I guess they are really broken. This is a bummer because I paid over 100 yen a piece for them.

Do you think I overheated these LEDs when I soldered them? 

How can I avoid this problem in the future?

Why did this only happen with this particular kind of surface mount LED? 

3 Replies

framistan (author)2010-07-19

They MIGHT have been bad before you installed them. You can check LED's using a digital volt meter by setting your meter to "diode test" If you forward bias the LED, it should light up (dimmly). if it doesn't light up, it is bad.

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steveastrouk (author)2010-07-19

Its really easy to damage SMD LEDs with too much heat. Did you use a conventional iron ? A hot-air gun is a much better way to set them.

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rickharris (author)2010-07-19

Are they the right way round? Did you include a series resistor.

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