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Author Topic: Erratic LED flickering issue  (Read 7156 times)

Bill Hinds

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Re: Erratic LED flickering issue
« Reply #10 on: December 03, 2012, 07:19:24 pm »

I had a similar problem with Chauvet LED PAR Tri-B fixtures several weeks after the initial install. Turned out one fixture went bad (was replaced under warranty). Thankfully there were only 7 fixtures in the chain but drove everyone crazy for a while as it was in the middle.

How did you determine it was bad? Remove it from the DMX chain?
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Bill Hinds

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Re: Erratic LED flickering issue
« Reply #11 on: December 03, 2012, 07:32:50 pm »

Well, today I go to continue with the trouble shooting process and guess what? No flickering!  Tried everything to make it flicker but no luck. So, I guess I will wait for it to start back up again as I know it did not just fix itself.
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Bill Hinds

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Re: Erratic LED flickering issue
« Reply #12 on: December 03, 2012, 07:36:52 pm »

Ok, here is a question.  Can a conventional dimmer cause noise onto the ground and create interference by getting into pin one on the DMX chain?  If so, what would could cause the dimmer to do this? I am starting to think this may be an electrical issue.
« Last Edit: December 03, 2012, 07:41:03 pm by Bill Hinds »
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Scott Hofmann

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Re: Erratic LED flickering issue
« Reply #13 on: December 04, 2012, 10:25:16 am »

How did you determine it was bad? Remove it from the DMX chain?
Yep, just plugged the Dmx in and out cables together and bypassed it.
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Scott Hofmann

Scott Hofmann

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Re: Erratic LED flickering issue
« Reply #14 on: December 04, 2012, 10:29:16 am »

Ok, here is a question.  Can a conventional dimmer cause noise onto the ground and create interference by getting into pin one on the DMX chain?  If so, what would could cause the dimmer to do this? I am starting to think this may be an electrical issue.
Not likely the dimmer would electrically affect it but you might try checking the AC feed for proper hot/neut/gnd condition and/or feeding AC from a different source to the LED's. Stranger things have happened.
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Scott Hofmann

Josh Daws

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Re: Erratic LED flickering issue
« Reply #15 on: December 10, 2012, 11:08:20 pm »

Yep, just plugged the Dmx in and out cables together and bypassed it.

this is very possible. i came across an issue in a bar where there was a small voltage running across the building ground and was wreaking a lot of havoc. my fix was a DMX splitter, more specifically the DMX Splitter 4 from microh (they also have a rackmount model). these specifically isolate the DMX ground from the building ground, both isolating and boosting the DMX signal. whilst also allowing you to split out 4 DMX chains per universe.
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Brett Gilbert

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Re: Erratic LED flickering issue
« Reply #16 on: December 17, 2012, 10:52:06 pm »

DMX optical isolators are always a good thing to have around to fix ground loop issues.  Also, some low-end LED fixtures are very very finicky about the DMX refresh rate.  I use Chauvet TRI-B fixtures and I'm really happy with them but initially I had issues with occasional flickers and flashes. I bought a Doug Fleenor DMX timing regenerator and they're flawless now.  Also, as a side benefit if the console goes down it will hold the last frame of DMX data that was active so you're not left in the dark.
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Brett Gilbert

ProSoundWeb Community

Re: Erratic LED flickering issue
« Reply #16 on: December 17, 2012, 10:52:06 pm »


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