Pixel protection injection

jediknight2

Full time elf
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Aug 30, 2012
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North Carolina
I have about 700 of these http://www.aliexpress.com/store/product/DC12V-input-WS2811-pixel-node-100pcs-a-string-injection-molding-type/701799_722405450.html from Ray. I LOVE them and they worked great last year. As I have said in previous posts I had 2 pixel failures after they went up. Only one of which required a repair. I did an inspection of my pixels and some do show some signs of water intrusion past the LED/Silicone jacket. I know that some silicones are acidic and I don't want to harm the board or put something in there that would attack the led prongs. However, I do want to do something to protect the pixel. So my options are

1-Inject each pixel with a non acidic silicone using a meat syringe.

2-Inject each pixel with dielectric grease using a meat syringe.

3-Use silicone to seal the edge where the LED meets the silicone jacket.

The problem with #1 is I have read of heat build up issues, not sure if this would be a problem with our boards as they don't really give off a lot of heat.

#2, I can see the pixel getting hot and the grease oozing out of the hole used to inject it and getting on the roof and everything else. Of course I could go between the jacket and LED to inject.

#3, only downside I can see is maybe distorting the color if I'm not careful applying the silicone. Maybe yellowing of the silicone?
 

Beefer

Apprentice elf
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Feb 19, 2012
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55
This is a known problem with this particular type of pixel node which was addressed by a new type of pixel, epoxy filled ones: http://www.aliexpress.com/store/product/led-pixel-node-WS2801-DC5V-input-IP68-50pcs-a-string/701799_722405738.html which does seem to behave a lot better (as long as the little circuit board and chip are positioned correctly deep inside the epoxy).

Well, I think this is one of those suck-it-and-see situations - give each one a try and see what happens :)

A failure rate of two pixels is pretty good in anyone's language, but IMHO, option 3 would be the best using a good quality silicone.
 

papa

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Feb 20, 2012
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ShellNZ

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Jun 17, 2012
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Karaka, Auckland, NZ
I also purchased a heap of these last year jedi, heaps have failed, I was slicing and dicing everywhere :(

I think I got 3 strings (300). I tested them a couple of months ago and there are still some bad ones in the bunch but I cant be bothered slicing anymore :(
 

jediknight2

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North Carolina
I am going to use silicone around the LED to seal it up. That is the only failure point I have seen. I like the technicolor...but they are 15 bux extra a string and that adds up quick with the shipping.

What's your solution Shell...
 

danozfw

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Jul 6, 2011
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jediknight2 said:
I am going to use silicone around the LED to seal it up. That is the only failure point I have seen. I like the technicolor...but they are 15 bux extra a string and that adds up quick with the shipping.

What's your solution Shell...
There is a group buy going on,check out Technicolor Christmas on Facebook. They are estimating $30 US per string.
 

Dave H

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Dec 19, 2010
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Clermont, Florida,
jediknight2 said:
I am going to use silicone around the LED to seal it up. That is the only failure point I have seen. I like the technicolor...but they are 15 bux extra a string and that adds up quick with the shipping.
But what is the cost of the failure rates that people are experiencing??

Technicolor may be the answer, but they haven't gone a season yet in actual use, like the concept though
 

logandc99

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Jul 13, 2012
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Heat shrink does come in clear but I've only had it in those multi-packs where you get different diameters and colours( black, red and clear)
 

kane

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Trigg (Northern suburbs of Perth)
Dave H said:
But what is the cost of the failure rates that people are experiencing??
Agree 100% - even just the time spent fixing dodgy pixels (and potential accidents climbing up ladders to do so) is worth a bit extra.

Dave H said:
Technicolor may be the answer, but they haven't gone a season yet in actual use, like the concept though
It will be interesting to see how they go. I know Zach has done a heap of testing, so hopefully that pays off
 

jediknight2

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Aug 30, 2012
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North Carolina
I am going to start off using silicone around the rubber jacket where it goes around the LED. I am going to then take a rag soaked in 303 and just wipe down the entire string to put a UV coat on it. The silicone should be good enough. If it doesn't hold up or work I will buy covers for next year.

If I can get a hold of Ray and change my order for this year, I am going to spring for the technicolor pixels spaced at 5-6"
 

jediknight2

Full time elf
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Aug 30, 2012
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North Carolina
I think I stumbled upon something perfect from another thread on here. Rubber dip, A.K.A Plasti-Dip. Comes in a Clear UV sprayable format. I can just lay the pixels out and give them a spray over the top and that should seal everything up nicely! A gallon is like 50 bux...but that should last me quite a while
 

Beefer

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Joined
Feb 19, 2012
Messages
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Cool - I'm going to be painting my car in that stuff!! matte-black... It looks awesome, didn't know it came in clear - should work very well.
 
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