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Pixel protection injection

Discussion in 'RGB Lights - Intelligent Pixels and 3-Channel RGB' started by jediknight2, Aug 7, 2013.

  1. jediknight2

    jediknight2 Full Time Elf

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    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?
     
  2. Beefer

    Beefer Apprentice Elf

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    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.
     
  3. papa

    papa New Elf

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  4. ShellNZ

    ShellNZ Senior Elf

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    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 :(
     
  5. OP
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    jediknight2

    jediknight2 Full Time Elf

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    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...
     
  6. ShellNZ

    ShellNZ Senior Elf

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    Find a happy place and imagine they are working perfectly :)
     
  7. danozfw

    danozfw New Elf

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    There is a group buy going on,check out Technicolor Christmas on Facebook. They are estimating $30 US per string.
     
  8. Dave H

    Dave H Apprentice Elf

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    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
     
  9. Winney

    Winney Is it time to start decorating?

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    Too bad heat shrink doesn't come in clear
     
  10. logandc99

    logandc99 Dedicated Elf

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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)
     
  11. kane

    kane Dedicated Elf

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    Agree 100% - even just the time spent fixing dodgy pixels (and potential accidents climbing up ladders to do so) is worth a bit extra.

    It will be interesting to see how they go. I know Zach has done a heap of testing, so hopefully that pays off
     
  12. Boof63

    Boof63 Senior Elf Generous Elf

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  13. OP
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    jediknight2

    jediknight2 Full Time Elf

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    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"
     
  14. OP
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    jediknight2

    jediknight2 Full Time Elf

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    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
     
  15. Beefer

    Beefer Apprentice Elf

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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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