Hi,
I have been asked to have a look at a LED Christmas light string on a 2ft snowman. It is a basic LED string wrapped around a wire frame.
The PSU is a 240v stepdown to 24v 580ma 10.4VA.
The voltage at the string appears to be fine but the string won't light. The string is not open circuit. I was told that it lit for about 30 minutes and then failed and has not come back again.
I am guessing I have a duff LED/resistor in the string but have no idea how to fault find this easily. If it was AC I would have used a tester pen at each LED but clearly I can't do that as it is DC.
Any suggestions would be gratefully received.
Thank you
I have been asked to have a look at a LED Christmas light string on a 2ft snowman. It is a basic LED string wrapped around a wire frame.
The PSU is a 240v stepdown to 24v 580ma 10.4VA.
The voltage at the string appears to be fine but the string won't light. The string is not open circuit. I was told that it lit for about 30 minutes and then failed and has not come back again.
I am guessing I have a duff LED/resistor in the string but have no idea how to fault find this easily. If it was AC I would have used a tester pen at each LED but clearly I can't do that as it is DC.
Any suggestions would be gratefully received.
Thank you
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