24V DC led lamp failures

[tomas557]

I have a circuit of 12 - 24VDC led lamps, but get many failures, which of course can be the lamp quality.

 

However I measured and while it measures 23.5V at the lamp socket, the polarity is reverse to what it should be.

 

Could this be the cause of the failures?

[Crossy]

If the lamps are lighting at all then they are polarity insensitive so it's unlikely to be the issue. Of course you could flip the ones that are "wrong" and see if it improves matters.

 

[tomas557]

10 hours ago, Crossy said:

If the lamps are lighting at all then they are polarity insensitive so it's unlikely to be the issue. Of course you could flip the ones that are "wrong" and see if it improves matters.

 

It's actually only 1 light that has reverse polarity, and I had 4 lamps dying in the past 30 days.

 

They came from China, you think that could have any influence on the failure rate

 

I had the local tv repair guy check one of the lamps, as I thought it might be the capacitor that failed, but he said that some of the led's were shorted.

[Crossy]

Can you post a photo of the electronics, but I'll lay odds that it's a very simple driver.

 

My money is on the China Syndrome