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Thread: What is causing this?

  1. #11
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    Default Re: What is causing this?

    What sort of solder are you using? It could be that the flux is hydroscopic?
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  2. #12
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    Default Re: What is causing this?

    Quote Originally Posted by David_AVD View Post
    What sort of solder are you using? It could be that the flux is hydroscopic?
    I have seen liquid flux do this and even grow mold. I decided to go the 1" pvc route (with shrink tubing around the board) and put cable glands on the end caps and have never had an issue. With the cost of Rob's boards I felt if I ever had an issue I would just toss the whole thing.
    This looks like water intrusion to me but it does look odd the way it ate around the solder joint.
    That's a feature not a bug.
    There's no charge for that.

  3. #13
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    Default Re: What is causing this?

    Quote Originally Posted by David_AVD View Post
    What sort of solder are you using? It could be that the flux is hydroscopic?
    I use this:
    https://www.amazon.com/Kester-24-633.../dp/B07S2YF5W8

    Sent from my SM-T710 using Tapatalk

  4. #14
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    Default Re: What is causing this?

    Some conformal coating / lacquer would probably be a good idea.
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  5. #15
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    Default Re: What is causing this?

    I brushed on 2 coats of conformal and then applied dielectric grease. After heat shrinking the dual wall adhesive heat shrink I decided to use zip ties at the ends. That should help with limiting water intrusion. I also snipped off the corners of the null pixel board which should help from getting any sharp edges puncturing through the heat shrink.

    Sent from my SM-T710 using Tapatalk

  6. #16
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    Default Re: What is causing this?

    Share an additional step I take . . . I use 2 pieces of heat shrink, the first is clear Polyolefin heat shrink. When this is heated, you can see it is sealed, and where more heat is needed. Looking thru the the heat shrink, cloudy needs more heat. Shiny all around is sealed. When shiny at both ends apply your dual wall adhesive heat shrink, covering both ends of Polyolefin heat shrink.

    Pmiller, I like your idea to smooth the corners.
    In Lights Therapy

  7. #17
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    Default Re: What is causing this?

    Quote Originally Posted by mrGrumpy View Post
    Share an additional step I take . . . I use 2 pieces of heat shrink, the first is clear Polyolefin heat shrink. When this is heated, you can see it is sealed, and where more heat is needed. Looking thru the the heat shrink, cloudy needs more heat. Shiny all around is sealed. When shiny at both ends apply your dual wall adhesive heat shrink, covering both ends of Polyolefin heat shrink.

    Pmiller, I like your idea to smooth the corners.
    Good idea about the clear. I'll have to try that. I was thinking if using 2 pieces of heat shrink, 1 on each side and overlapped about a 1/2" in the middle but decided not too because that could turn into a third way for water to get in. I stuck with 1 piece where water could only get in on ends. Is that clear adhesive lined?

    Sent from my SM-T710 using Tapatalk

  8. #18
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    Default Re: What is causing this?

    No, I didnít use adhesive there.

    PM me an address and Iíll send you a piece to try.
    In Lights Therapy

  9. #19
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    Default Re: What is causing this?

    I have about 30 feet of clear. I actually use the clear for covering the pigtail numbers used for marking electrical wire.

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