Circuit board glue

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  • yyonline
    Badcaps Veteran
    • Jul 2009
    • 692
    • USA

    #1

    Circuit board glue

    I am working on repairing an Acer AL2223W monitor. I opened it up to find bloated Capxon capacitors on the power supply board, and bloated Teapo on the logic board. So, the first order of business was to replace all the capacitors. However, the lamps still turn off after a few seconds.

    It seems like the inverter transformer is at fault here, as it has power to the transformer, but no power after it - so I ordered a new one:
    http://www.lcdparts.net/TransformerD...ber=T-8TC00332

    Now, the board has a blob of white glue over every one of the solder joints on the high voltage side. I'm assuming that this is for extra insulation. Does anybody know what this stuff is? I'm assuming that it's something digikey or mouser would carry, if I knew what kind of glue it was. It's the same flexible white glue that manufacturers love to smear all over power supply boards. It's not the hard glue that turns brown over time. It would probably work fine without it, but I'd prefer to have the extra insulation if possible.
  • multimeter
    Badcaps Veteran
    • Jan 2011
    • 739
    • united kingdom

    #2
    Re: Circuit board glue

    just use silicone,or decorators caulking,works fine i use it all the time,just make sure it has dried properly before applying power to the monitor
    fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!

    ----------------------------------------------
    please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!

    Comment

    • PCBONEZ
      Grumpy Old Fart
      • Aug 2005
      • 10661
      • USA

      #3
      Re: Circuit board glue

      Originally posted by multimeter
      just use silicone,or decorators caulking,works fine i use it all the time,just make sure it has dried properly before applying power to the monitor
      Some of those products can be conductive when cured.
      If it doesn't mention non-conductive on the label or the manufacturers site then don't use it.
      .
      Mann-Made Global Warming.
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      Comment

      • Krankshaft
        Badcaps Legend
        • Jan 2007
        • 2328
        • USA

        #4
        Re: Circuit board glue

        Use Permatex Ultra Gray RTV from an auto parts store a Panasonic TV I worked on used a similar rubbery gray substance on the main IC contacts presumably for insulation purposes.

        The service manual didn't specify what it was so I used RTV never had any pin shorts or damage.
        Last edited by Krankshaft; 03-20-2011, 05:11 PM.
        Elements of the past and the future combining to make something not quite as good as either.

        Comment

        • yyonline
          Badcaps Veteran
          • Jul 2009
          • 692
          • USA

          #5
          Re: Circuit board glue

          The existing stuff does appear to be very similar in texture to RTV silicone.

          Here's two options I came up with:
          http://www.mgchemicals.com/products/162.html


          It doesn't specifically say non-conductive, but it gives an electrical volume resistance that is (seemingly) very high. However, I am not familiar with the this measurement for this application. I'd welcome any thoughts people may have.

          Comment

          • PlainBill
            Badcaps Legend
            • Feb 2009
            • 7034
            • USA

            #6
            Re: Circuit board glue

            Originally posted by yyonline
            The existing stuff does appear to be very similar in texture to RTV silicone.

            Here's two options I came up with:
            http://www.mgchemicals.com/products/162.html


            It doesn't specifically say non-conductive, but it gives an electrical volume resistance that is (seemingly) very high. However, I am not familiar with the this measurement for this application. I'd welcome any thoughts people may have.
            Either of those will work. I was also going to suggest GE Silicon II clear tub and tile sealant, but have not been able to find an equivalent datasheet.

            PlainBill
            For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

            Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

            Comment

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