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Strangest problem I've seen yet


chuckd
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This is the third night in a row that I've had a strand of lights 'dead short', blowing the fuses in the strand.  These are LED strands, and of course, I've had failures in the past, but they're usually just total failures.

 

The weird thing is that these strands are all restricted to one LOR 1602W, channels 3, 6 and 8!

 

Now, I have about 72 LOR 1602's spread all over the place.  What are the odds that I coincidentally have dead shorts on the lower 8 channels of one box?  But I can't wrap my head around any failure mode of a box that could cause a 'short' condition.

 

Any ideas?  Or is it just gremlins?

 

Chuck

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  • 3 weeks later...

The LEDs are shorting? They are taking their fuses, or the controller fuses out at the same time? They read zero ohms past the fuse holder when testing after the fact?

I do tend to lean towards it being something coincidental outside the controller by the way. I'm guessing these strands are also in close physical proximity, which may be related to the cause.

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  • 3 weeks later...

OK, Chuck... Something is going on, here,  WHY ? that's the funny thing, I have one controller that channels 3, 6, & 8  Blink ! (no show, simply power up the controller and those channels blink about one second intervals, sometimes it's only one or two channels BUT, it;s ONLY those three (3,6 & 8)

 

U do Voodo to me or something ?

 

I've done a reset (hard) and still the same, the channels work in the show, it's just the blinking....

 

When I can get down there, I'm going to change the Flip Flop IC's side for side, and see if the problem jumps to the other bank in that controller.

 

Ironicly I had socketed the MOC Opto-couplers, swapped a couple but the channels stay the same, (If I pull the opto's the channels are dead, so it's NOT triac's).

 

So problem is down to 2 parts, Flip Flop IC or the processor itself, will know soon enough...

 

Greg

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